EP0573957B1 - Apparatus for blast machining of material - Google Patents

Apparatus for blast machining of material Download PDF

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Publication number
EP0573957B1
EP0573957B1 EP93109199A EP93109199A EP0573957B1 EP 0573957 B1 EP0573957 B1 EP 0573957B1 EP 93109199 A EP93109199 A EP 93109199A EP 93109199 A EP93109199 A EP 93109199A EP 0573957 B1 EP0573957 B1 EP 0573957B1
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EP
European Patent Office
Prior art keywords
nozzle
flow
section
nozzle element
liquid
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EP93109199A
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German (de)
French (fr)
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EP0573957A1 (en
Inventor
Günter Max Raml
Frank Löschmann
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/14—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas designed for spraying particulate materials
    • B05B7/1481—Spray pistols or apparatus for discharging particulate material
    • B05B7/149—Spray pistols or apparatus for discharging particulate material with separate inlets for a particulate material and a liquid to be sprayed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C5/00—Devices or accessories for generating abrasive blasts
    • B24C5/02—Blast guns, e.g. for generating high velocity abrasive fluid jets for cutting materials
    • B24C5/04—Nozzles therefor

Definitions

  • the invention relates to a device for beam processing of materials according to the preamble of patent claim 1.
  • Devices of this type are used, for example, as cleaning devices in the field of facade cleaning or monument conservation.
  • a mixture of air, water and abrasion particles for example sand
  • abrasion particles for example sand
  • relatively high pressure as a result of which the dirt particles adhering to the surface or rust and outer patina layers are removed from metal objects.
  • a problem with sandblasting is that there is often high water consumption, which increases the overall cost of the process.
  • high water consumption there are increased disposal problems, since the water enriched with dirt particles and possible additives must not get into the normal drain, but rather, for example, collected at the foot of the facade by means of suitable containers and in special facilities must be cleaned or reprocessed.
  • a blasting gun is known in which compressed air is used to generate a negative pressure within the blasting gun in order to suck in blasting material through an axially adjustable feed nozzle.
  • the cross section of the inflow openings for the compressed air is changed there by corresponding nozzle assemblies with different diameters.
  • a suction jet gun is known from CH-A-596 956, in which water is fed under pressure to a mixing chamber via a circumferential gap. The treatment agent is sucked in there by the negative pressure generated by the water.
  • the problem with this known device is that its service life is relatively short due to the high wear caused by friction.
  • the invention is therefore based on the object of creating a device according to the preamble of claim 1 which is as simple as possible to suit the respective conditions optimally adaptable admixture of the liquid over a wide setting range with the lowest possible liquid consumption and long service life of the device.
  • the amount of liquid is metered through the liquid inflow opening itself, so that upstream metering elements within the liquid supply line are dispensed with and the latter can be constructed very simply.
  • Another advantage is that the amount of liquid supplied can be adjusted over a wide range and very precisely, since the liquid inflow opening is immediately in front of the cavity in the direction of flow and there are no downstream elements or openings, the shape and size of the inflow conditions into the cavity determine.
  • the liquid inflow opening is designed as a circumferential gap, which enables a very simple manufacture of the liquid inflow opening and a uniform supply of the liquid into the cavity from all sides of the peripheral wall.
  • the liquid inflow opening is aligned in the region of its mouth parallel to the wall of the cavity lying behind the liquid inflow opening in the direction of flow of the blasting material.
  • the liquid supplied to the cavity is hereby deliberately guided along the circumferential wall of the cavity, so that a protective liquid layer forms between the wall of the cavity and the abrasion particles.
  • this layer of liquid the nozzle is significantly less worn by the abrasion particles, which increases its service life.
  • the liquid jacket protecting the peripheral wall of the cavity has a particularly advantageous effect on the life of the device when working at very high pressures. This is the case, for example, when the device is used for jet cutting materials, where, depending on the material to be cut, for example stone, steel, wood, fabrics or any other materials of all degrees of hardness, pressures of 1000 bar or more may be required.
  • the liquid jacket at least largely keeps the abrasion particles away from the peripheral wall of the cavity and considerably reduces the wear on the nozzle.
  • a nozzle element consists of a hollow-cylindrical insert part which is arranged to be axially movable within a nozzle shell, and the other nozzle element consists of a further hollow-cylindrical insert part which is immovably connected to the nozzle shell and which is arranged within the nozzle shell in alignment with the first insert part, the cavity inside the insert parts are designed.
  • the device according to the invention has, in addition to a high abrasion resistance to the blasting material, also a low weight, which improves the handling of the device.
  • only the insert parts can be replaced, while the nozzle jacket and the connection devices provided thereon can continue to be used.
  • flow guide elements are provided on at least one of the two walls of the nozzle elements delimiting the liquid inflow opening, in order to give the liquid flowing into the cavity a spiral flow direction around the central axis of the nozzle.
  • the jet emerging from the nozzle is thereby given a swirl with which the shape of the jet can be influenced in a favorable manner.
  • nozzle 1 shows a nozzle 1 with an elongated, hollow cylindrical nozzle jacket 2, in which two nozzle elements in the form of hollow cylindrical insert parts 3, 4 are provided.
  • the nozzle jacket is connected to a liquid inflow nozzle 5.
  • the nozzle jacket 2 has a continuous longitudinal bore 7, which is arranged centrally to its central axis 6, for receiving the insert parts 3, 4 and consists of a section 9 with an internal thread 8 with an enlarged diameter and a section 10 with a smaller diameter adjoining it in the direction of flow.
  • the two sections 9, 10 are connected to one another via a radial shoulder 11.
  • the insert parts 3, 4 are arranged one behind the other in the flow direction and in alignment with the central axis 6. They delimit with their inner circumferential walls a continuous cavity 12 which has an inlet opening 13 for abrasion particles, for example sand, at the inflow end and an outlet opening 14 for the blasting material at the outlet end.
  • the direction of flow of the abrasion particles entering via the inlet opening 13 is indicated by the arrow 15.
  • the insert part 3 which has the inlet opening 13 is inserted approximately up to the center of the nozzle shell 2 in its longitudinal bore 7 and is arranged to be axially movable therein.
  • the insert part 3 has a section 16 with an enlarged outer diameter, which carries an external thread 17 which can be screwed into the internal thread 8 of the nozzle casing 2.
  • the insert part 3 is provided with a downstream section 18 with a smaller diameter when viewed in the direction of flow, which section is guided axially displaceably within the section 10 of the longitudinal bore 7.
  • a lock nut 19 is screwed onto the section of the external part 17 of the insert part projecting beyond the end face of the nozzle casing 2, whereby the external thread 17 and the internal thread 8 of the nozzle casing 2 are braced against one another can be.
  • the insert 3 can be connected to a supply line (not shown) for the abrasion particles via an end region projecting axially via the lock nut 19.
  • the insert 4 lying in the flow direction behind the insert 3 consists of a tubular sleeve and is fixed within the section 10 of the longitudinal bore 7 by means of a screw, not shown, which is screwed into a radial threaded bore 20 of the nozzle casing 2 and against the outer peripheral wall of the insert 4 presses.
  • the insert parts 3, 4 are dimensioned such that the inside diameter of the insert part 4 is larger than the inside diameter of the insert part 3, but smaller than its outside diameter in an end section 21, which is adjacent to the insert part 4 and to the section 18 of the insert part 3 in the flow direction connects.
  • the insert part 3 is only screwed so far into the nozzle casing 2 that its end facing the insert part 4 still has a certain distance from the adjacent end region of the insert part 4, so that a circumferential, annular gap is present between the two insert parts 3, 4 represents a liquid inflow opening 22 for the liquid supplied via the liquid inflow nozzle 5.
  • the liquid inflow opening 22 is arcuate in longitudinal section and is delimited on the side of the insert 4 by a convex wall 23 which extends from the end of the insert 4 to the inner peripheral wall.
  • the liquid inflow opening 22 is delimited by a concave wall 24, which has approximately the same curvature as the convex wall 23 of the insert part 4 and is provided on the end of the end region 21 facing the insert part 4.
  • the liquid inflow opening 22 runs along and parallel to the inner peripheral wall of the insert part 4, so that the liquid flowing into the cavity 12 receives a flow direction which runs parallel to the inner peripheral wall of the insert part 4.
  • a liquid jacket is produced on this inner peripheral wall, which significantly reduces the wear of the insert 4 due to the blasting material.
  • the orientation of the liquid inflow opening 22 parallel to the circumferential wall can be effected in a simple manner by an axial projection 25 which connects to the concave wall 24 towards the end face of the insert part 3 and can be inserted into the insert part 4 at a radial distance.
  • the outer circumferential surface of the projection 25 runs parallel here to the inner peripheral surface of the insert part 4.
  • the convex wall 23 and / or the concave wall 24 can have inclined webs, not shown, which give the inflowing liquid a spiral flow direction around the central axis 6.
  • the liquid inflow opening 22 is connected to a circumferential annular chamber 26 which is delimited radially inwards by the end section 21 of the insert part 3 and radially outwards by the nozzle jacket 2.
  • the annular chamber 26 is in turn connected to a radial bore 27 of the nozzle casing 2, into which a fastening section of the liquid inflow nozzle 5 can be inserted.
  • the attachment of the liquid inflow nozzle 5 to the nozzle jacket 2 can be carried out, for example, in that the bore 27 is designed as a threaded bore and the fastening section of the liquid inflow nozzle 5 is screwed into the bore 27 until a flange 28 of the liquid inflow nozzle 5 rests on the outer surface of the nozzle jacket 2 .
  • elastic sealing means in the form of O-rings 29 are provided on both sides of the annular chamber, which are located in radial grooves of the nozzle casing 2 lie and are in sealing contact with the outer peripheral surfaces of the insert parts 3, 4.
  • FIG. 2 An embodiment variant of the invention is described in FIG. 2, in which the inflow direction of the wear particles is indicated by the arrow 30.
  • Fig. 1 In contrast to Fig. 1 is in the embodiment of 2 does not have the insert part having the inlet opening 13 axially movable within the nozzle casing 2, but rather the insert part following in the flow direction.
  • the corresponding insert parts are designated 3 ', 4' in FIG. 2.
  • the rest of the structure essentially corresponds to the exemplary embodiment in FIG. 1.
  • the insert parts 3, 3 ', 4, 4' are advantageously made of a wear-resistant material, for example hardened steel, while the casing 2, 2 'can be made of aluminum or plastic.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Nozzles (AREA)
  • Chemical Or Physical Treatment Of Fibers (AREA)
  • Glass Compositions (AREA)
  • Apparatuses For Bulk Treatment Of Fruits And Vegetables And Apparatuses For Preparing Feeds (AREA)
  • Cleaning In General (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Manufacturing Of Micro-Capsules (AREA)

Abstract

An apparatus for the abrasive blasting of materials by means of an abrasive medium which is mixed with a liquid and contains, in particular, granulate-type abrasion particles is characterised in that the liquid-inflow opening (22) is designed as a peripheral gap and is delimited by nozzle elements (3, 3', 4, 4') which can move relative to one another and can be fixed in the relevant position, and in that the cross-section, through which flow occurs, of the liquid-inflow opening (22) can be changed by the relative movement of said nozzle elements (3, 3', 4, 4'). In the region of its mouth, the liquid-inflow opening is aligned in parallel with the wall which is located behind the liquid-inflow opening (22), seen in the direction of flow of the abrasive medium, and belongs to the cavity (12), with the result that a liquid shroud protecting said wall of the cavity (12) is formed.

Description

Die Erfindung betrifft eine Vorrichtung zur Strahlbearbeitung von Materialien gemäß dem Oberbegriff des Patentanspruchs 1.The invention relates to a device for beam processing of materials according to the preamble of patent claim 1.

Derartige Vorrichtungen werden beispielsweise als Reinigungsgeräte im Bereich der Fassadenreinigung oder Denkmalpflege eingesetzt. Hierbei wird ein Gemisch aus Luft, Wasser und Abriebteilchen, beispielsweise Sand, mit relativ hohem Druck gegen die zu reinigenden Oberflächen gesprüht, wodurch die an der Oberflache haftenden Schmutzpartikel bzw. Rost- und äußere Patinaschichten bei Metallgegenständen abgetragen werden. Um dabei das gewünschte Arbeitsergebnis zu erhalten, ist es möglich, das Gemisch mit chemischen Zusatzstoffen anzureichern, Art und Form der Abriebteilchen sowie das Mengenverhältnis der Gemischkomponenten zu variieren und den Druck zu verändern.Devices of this type are used, for example, as cleaning devices in the field of facade cleaning or monument conservation. Here, a mixture of air, water and abrasion particles, for example sand, is sprayed against the surfaces to be cleaned with relatively high pressure, as a result of which the dirt particles adhering to the surface or rust and outer patina layers are removed from metal objects. In order to obtain the desired work result, it is possible to enrich the mixture with chemical additives, to vary the type and shape of the abrasion particles and the ratio of the mixture components and to change the pressure.

Ein Problem liegt beim Sandstrahlen darin, daß häufig ein hoher Wasserverbrauch vorliegt, wodurch die Gesamtkosten des Verfahrens erhöht werden. Außerdem entstehen bei einem hohen Wasserverbrauch erhöhte Entsorgungsprobleme, da das mit Schmutzpartikeln und eventuellen Zusatzstoffen angereicherte Wasser nicht in den normalen Abfluß gelangen darf, sondern beispielsweise am Fuß der Fassade mittels geeigneter Behälter aufgefangen und in speziellen Einrichtungen gereinigt bzw. wiederaufbereitet werden muß.A problem with sandblasting is that there is often high water consumption, which increases the overall cost of the process. In addition, with high water consumption, there are increased disposal problems, since the water enriched with dirt particles and possible additives must not get into the normal drain, but rather, for example, collected at the foot of the facade by means of suitable containers and in special facilities must be cleaned or reprocessed.

Aus der AU-B-25 10 784 ist eine Vorrichtung der eingangs genannten Art bekannt, bei der die Flüssigkeitseinströmöffnung aus einzelnen Axialbohrungen besteht, die in Axialrichtung zur Austrittsseite hin konisch zusammenlaufen. Nachteilig ist hierbei jedoch, daß für verschiedene Einsatzzwecke verschiedene Einsatzteile mit unterschiedlichen Bohrungsdurchmessern verwendet werden müssen, je nachdem, welche Flüssigkeitsmengen und Drücke erforderlich sind. Der Austausch und die Bevorratung derartiger Einsätze ist jedoch mit einem erheblichen Zeit- und Kostenaufwand verbunden. Mit demselben Einsatzteil ist die Flüssigkeitsmenge dagegen lediglich über den Flüssigkeitsdruck und nicht in dem gewünschten weiten Bereich veränderbar. Weiterhin ist die Lebensdauer dieser bekannten Strahldüse verschleißbedingt relativ kurz.From AU-B-25 10 784 a device of the type mentioned is known, in which the liquid inflow opening consists of individual axial bores which converge conically in the axial direction towards the outlet side. The disadvantage here, however, is that different insert parts with different bore diameters have to be used for different purposes, depending on the liquid quantities and pressures required. The exchange and stockpiling of such assignments is, however, associated with a considerable expenditure of time and money. With the same insert, however, the amount of liquid can only be changed via the liquid pressure and not within the desired wide range. Furthermore, the service life of this known jet nozzle is relatively short due to wear.

Aus der DE-U-19 82 295 ist eine Strahlpistole bekannt, bei der Druckluft zum Erzeugen eines Unterdrucks innerhalb der Strahlpistole verwendet wird, um Strahlgut durch eine axial verstellbare Zuführdüse hindurch anzusaugen. Der Querschnitt der Einströmöffnungen für die Druckluft wird dort durch entsprechende Düsenzusammenstellungen mit verschiedenen Durchmessern verändert.From DE-U-19 82 295 a blasting gun is known in which compressed air is used to generate a negative pressure within the blasting gun in order to suck in blasting material through an axially adjustable feed nozzle. The cross section of the inflow openings for the compressed air is changed there by corresponding nozzle assemblies with different diameters.

Weiterhin ist aus der CH-A-596 956 eine Saugstrahlpistole bekannt, bei der Wasser unter Druck über einen umlaufenden Spalt einer Mischkammer zugeführt wird. Das Behandlungsmittel wird dort durch den vom Wasser erzeugten Unterdruck angesaugt. Problematisch ist bei dieser bekannten Vorrichtung jedoch, daß ihre Lebensdauer aufgrund des reibungsbedingten hohen Verschleißes relativ kurz ist.Furthermore, a suction jet gun is known from CH-A-596 956, in which water is fed under pressure to a mixing chamber via a circumferential gap. The treatment agent is sucked in there by the negative pressure generated by the water. The problem with this known device, however, is that its service life is relatively short due to the high wear caused by friction.

Der Erfindung liegt daher die Aufgabe zugrunde, eine Vorrichtung gemäß dem Oberbegriff des Anspruchs 1 zu schaffen, die auf möglichst einfache Weise eine den jeweiligen Verhältnissen optimal anpaßbare Zumischung der Flüssigkeit über einen weiten Einstellbereich bei möglichst geringem Flüssigkeitsverbrauch und langer Standzeit der Vorrichtung ermöglicht.The invention is therefore based on the object of creating a device according to the preamble of claim 1 which is as simple as possible to suit the respective conditions optimally adaptable admixture of the liquid over a wide setting range with the lowest possible liquid consumption and long service life of the device.

Diese Aufgabe wird erfindungsgemäß durch die Merkmale des Anspruchs 1 gelöst.This object is achieved by the features of claim 1.

Bei der erfindungsgemäßen Vorrichtung erfolgt die Dosierung der Flüssigkeitsmenge durch die Flüssigkeitseinströmöffnung selbst, so daß vorgeschaltete Dosierelemente innerhalb der Flüssigkeitsversorgungsleitung entfallen und diese sehr einfach aufgebaut sein kann. Von Vorteil ist weiterhin, daß die zugeführte Flüssigkeitsmenge über einen weiten Bereich und sehr genau eingestellt werden kann, da die Flüssigkeitseinströmöffnung in Strömungsrichtung unmittelbar vor dem Hohlraum liegt und keine nachgeschalteten Elemente oder Öffnungen vorhanden sind, die durch ihre Form und Größe die Einströmverhältnisse in den Hohlraum bestimmen.In the device according to the invention, the amount of liquid is metered through the liquid inflow opening itself, so that upstream metering elements within the liquid supply line are dispensed with and the latter can be constructed very simply. Another advantage is that the amount of liquid supplied can be adjusted over a wide range and very precisely, since the liquid inflow opening is immediately in front of the cavity in the direction of flow and there are no downstream elements or openings, the shape and size of the inflow conditions into the cavity determine.

Vorteilhaft ist dabei insbesondere, daß auch bei sehr niedrigen Flüssigkeitsdrücken von beispielsweise 5 bar und geringen Flüssigkeitsmengen gearbeitet werden kann, wodurch eine besonders schonende Oberflächenbehandlung ermöglicht wird. Hierdurch ist außerdem für die erfindungsgemäße Vorrichtung ein weiter Einsatzbereich gegeben und es können einerseits die Entsorgungsprobleme und andererseits die Kosten für die Bereitstellung der ungebrauchten Flüssigkeit und für die Entsorgung und Wiederaufbereitung der verschmutzten Flüssigkeit nach der Strahlbehandlung beträchtlich verringert werden. Dieser Aspekt ist gerade hinsichtlich der Umweltverträglichkeit von ganz wesentlicher Bedeutung.It is particularly advantageous that it is possible to work even at very low liquid pressures of, for example, 5 bar and small amounts of liquid, which enables a particularly gentle surface treatment. This also provides a wide range of applications for the device according to the invention, and on the one hand the disposal problems and on the other hand the costs for the provision of the unused liquid and for the disposal and reprocessing of the contaminated liquid after the blasting treatment can be considerably reduced. This aspect is particularly important with regard to environmental compatibility.

Die Flüssigkeitseinströmöffnung ist als umlaufender Spalt ausgebildet, wodurch eine sehr einfache Herstellung der Flüssigkeitseinströmöffnung und eine gleichmäßige Zuführung der Flüssigkeit von allen Seiten der Umfangswand her in den Hohlraum ermöglicht wird.The liquid inflow opening is designed as a circumferential gap, which enables a very simple manufacture of the liquid inflow opening and a uniform supply of the liquid into the cavity from all sides of the peripheral wall.

Dabei ist es besonders vorteilhaft, daß die Flüssigkeitseinströmöffnung im Bereich ihrer Mündung parallel zur in Strömungsrichtung des Strahlguts gesehen hinter der Flüssigkeitseinströmöffnung liegenden Wand des Hohlraums ausgerichtet ist. Die dem Hohlraum zugeführte Flüssigkeit wird hierdurch gezielt entlang der Umfangswand des Hohlraums geführt, so daß sich eine Flüssigkeitsschutzschicht zwischen der Wandung des Hohlraums und den Abriebteilchen ausbildet. Aufgrund dieser Flüssigkeitsschicht wird die Düse durch die Abriebteilchen wesentlich weniger abgenutzt, wodurch ihre Lebensdauer erhöht wird.It is particularly advantageous that the liquid inflow opening is aligned in the region of its mouth parallel to the wall of the cavity lying behind the liquid inflow opening in the direction of flow of the blasting material. The liquid supplied to the cavity is hereby deliberately guided along the circumferential wall of the cavity, so that a protective liquid layer forms between the wall of the cavity and the abrasion particles. As a result of this layer of liquid, the nozzle is significantly less worn by the abrasion particles, which increases its service life.

Der die Umfangswand des Hohlraums schützende Flüssigkeitsmantel wirkt sich auf die Lebensdauer der Vorrichtung besonders vorteilhaft aus, wenn mit sehr hohen Drücken gearbeitet wird. Dies ist beispielsweise der Fall, wenn die Vorrichtung zum Strahlschneiden von Materialien verwendet wird, wo in Abhängigkeit von dem zu schneidenden Material, beispielsweise Stein, Stahl, Holz, Stoffe oder beliebige andere Materialien aller Härtegrade, Drücke von 1000 bar oder mehr erforderlich sein können. Der Flüssigkeitsmantel hält auch hierbei die Abriebteilchen zumindest zum großen Teil von der Umfangswand des Hohlraums fern und vermindert die Abnutzung der Düse ganz erheblich.The liquid jacket protecting the peripheral wall of the cavity has a particularly advantageous effect on the life of the device when working at very high pressures. This is the case, for example, when the device is used for jet cutting materials, where, depending on the material to be cut, for example stone, steel, wood, fabrics or any other materials of all degrees of hardness, pressures of 1000 bar or more may be required. Here, too, the liquid jacket at least largely keeps the abrasion particles away from the peripheral wall of the cavity and considerably reduces the wear on the nozzle.

Vorteilhafterweise besteht ein Düsenelement aus einem hohlzylinderförmigen Einsatzteil, das innerhalb eines Düsenmantels axial bewegbar angeordnet ist, und das andere Düsenelement aus einem weiteren, hohlzylinderförmigen, mit dem Düsenmantel unbewegbar verbundenen Einsatzteil, das innerhalb des Düsenmantels fluchtend zum ersten Einsatzteil angeordnet ist, wobei der Hohlraum innerhalb der Einsatzteile ausgebildet ist.Advantageously, a nozzle element consists of a hollow-cylindrical insert part which is arranged to be axially movable within a nozzle shell, and the other nozzle element consists of a further hollow-cylindrical insert part which is immovably connected to the nozzle shell and which is arranged within the nozzle shell in alignment with the first insert part, the cavity inside the insert parts are designed.

Bei einer derartigen Anordnung ist es möglich, nur die Einzsatzteile aus einem sehr verschleißfesten Material, beispielsweise gehärtetem Stahl, herzustellen, während der Düsenmantel aus einem relativ leichten Material, beispielsAluminium oder Kunststoff, bestehen kann. Die erfindungsgemäße Vorrichtung weist hierdurch neben einer hohen Abriebfestigkeit gegenüber dem Strahlgut auch ein geringes Gewicht auf, wodurch die Handhabbarkeit der Vorrichtung verbessert wird. Außerdem können gegebenenfalls lediglich die Einsatzteile ausgewechselt werden, während der Düsenmantel und die daran vorgesehenen Anschlußeinrichtungen weiterverwendet werden können.With such an arrangement, it is possible to manufacture only the insert parts from a very wear-resistant material, for example hardened steel, while the nozzle casing is made of a relatively light material, for example aluminum or plastic. As a result, the device according to the invention has, in addition to a high abrasion resistance to the blasting material, also a low weight, which improves the handling of the device. In addition, if necessary, only the insert parts can be replaced, while the nozzle jacket and the connection devices provided thereon can continue to be used.

Gemäß einer weiteren vorteihaften Ausführungsform sind an mindestens einer der beiden die Flüssigkeitseinströmöffnung begrenzenden Wände der Düsenelemente Strömungsleitelemente vorgesehen, um der in den Hohlraum einströmenden Flüssigkeit eine spiralförmige Strömungsrichtung um die Mittelachse der Düse herum zu verleihen. Der aus der Düse austretende Strahl erhält hierdurch einen Drall, mit dem die Form des Strahls in günstiger Weise beeinflußt werden kann.According to a further advantageous embodiment, flow guide elements are provided on at least one of the two walls of the nozzle elements delimiting the liquid inflow opening, in order to give the liquid flowing into the cavity a spiral flow direction around the central axis of the nozzle. The jet emerging from the nozzle is thereby given a swirl with which the shape of the jet can be influenced in a favorable manner.

Weitere vorteilhafte Ausgestaltungen der Erfindung sind aus den Unteransprüchen ersichtlich.Further advantageous embodiments of the invention can be seen from the subclaims.

Die Erfindung wird nachfolgend anhand der Zeichnung beispielsweise naher erläutert; in dieser zeigt:

Fig. 1
einen teilweise geschnittenen Längsschnitt durch die erfindungsgemäße Düse und
Fig. 2
eine Ausbildungsvariante der Düse von Fig. 1.
The invention is explained in more detail below with reference to the drawing, for example; in this shows:
Fig. 1
a partially sectioned longitudinal section through the nozzle according to the invention and
Fig. 2
a variant of the nozzle of Fig. 1st

Aus Fig. 1 ist eine Düse 1 mit einem länglichen, hohlzylindrischen Düsenmantel 2 ersichtlich, in dem zwei Düsenelemente in der Form von hohlzylindrischen Einsatzteilen 3, 4 vorgesehen sind. Der Düsenmantel ist mit einem Flüssigkeitseinströmstutzen 5 verbunden.1 shows a nozzle 1 with an elongated, hollow cylindrical nozzle jacket 2, in which two nozzle elements in the form of hollow cylindrical insert parts 3, 4 are provided. The nozzle jacket is connected to a liquid inflow nozzle 5.

Der Düsenmantel 2 weist zur Aufnahme der Einsatzteile 3, 4 eine mittig zu seiner Mittelachse 6 angeordnete, durchgehende Langsbohrung 7 auf, die aus einem mit einem Innengewinde 8 versehenen Abschnitt 9 mit erweitertem Durchmesser und einem in Strömungsrichtung daran anschließenden Abschnitt 10 mit geringerem Durchmesser besteht. Die beiden Abschnitte 9, 10 sind über eine radiale Schulter 11 miteinander verbunden.The nozzle jacket 2 has a continuous longitudinal bore 7, which is arranged centrally to its central axis 6, for receiving the insert parts 3, 4 and consists of a section 9 with an internal thread 8 with an enlarged diameter and a section 10 with a smaller diameter adjoining it in the direction of flow. The two sections 9, 10 are connected to one another via a radial shoulder 11.

Die Einsatzteile 3, 4 sind in Strömungsrichtung hintereinander und fluchtend zur Mittelachse 6 angeordnet. Sie begrenzen mit ihren inneren Umfangswanden einen durchgehenden Hohlraum 12, der am einströmseitigen Ende eine Einlaßöffnung 13 für Abriebteilchen, beispielsweise Sand, und am auslaßseitigen Ende eine Austrittsöffnung 14 für das Strahlgut aufweist. Die Strömungsrichtung der über die Einlaßöffnung 13 eintretenden Abriebteilchen ist mit dem Pfeil 15 gekennzeichnet.The insert parts 3, 4 are arranged one behind the other in the flow direction and in alignment with the central axis 6. They delimit with their inner circumferential walls a continuous cavity 12 which has an inlet opening 13 for abrasion particles, for example sand, at the inflow end and an outlet opening 14 for the blasting material at the outlet end. The direction of flow of the abrasion particles entering via the inlet opening 13 is indicated by the arrow 15.

Das die Einlaßöffnung 13 aufweisende Einsatzteil 3 ist etwa bis zur Mitte des Düsenmantels 2 in dessen Langsbohrung 7 eingeführt und in dieser axial bewegbar angeordnet. Hierzu weist das Einsatzteil 3 einen Abschnitt 16 mit erweitertem Außendurchmesser auf, der ein in das Innengewinde 8 des Düsenmantels 2 einschraubbares Außengewinde 17 trägt. Weiterhin ist das Einsatzteil 3 mit einem in Strömungsrichtung gesehen nachfolgenden Abschnitt 18 mit geringerem Durchmesser versehen, welcher innerhalb des Abschnitts 10 der Längsbohrung 7 axial verschiebbar geführt.The insert part 3 which has the inlet opening 13 is inserted approximately up to the center of the nozzle shell 2 in its longitudinal bore 7 and is arranged to be axially movable therein. For this the insert part 3 has a section 16 with an enlarged outer diameter, which carries an external thread 17 which can be screwed into the internal thread 8 of the nozzle casing 2. Furthermore, the insert part 3 is provided with a downstream section 18 with a smaller diameter when viewed in the direction of flow, which section is guided axially displaceably within the section 10 of the longitudinal bore 7.

Um die gewünschte relative Position des Einsatzteils 3 bezüglich des Düsenmantels 2 festlegen zu können, wird auf den über die Stirnseite des Düsenmantels 2 hinausstehenden Abschnitt des Einsatzteil-Außengewindes 17 eine Kontermutter 19 aufgeschraubt, wodurch das Außengewinde 17 und das Innengewinde 8 des Düsenmantels 2 gegeneinander verspannt werden können.In order to be able to determine the desired relative position of the insert part 3 with respect to the nozzle casing 2, a lock nut 19 is screwed onto the section of the external part 17 of the insert part projecting beyond the end face of the nozzle casing 2, whereby the external thread 17 and the internal thread 8 of the nozzle casing 2 are braced against one another can be.

Über einen über die Kontermutter 19 axial vorstehenden Endbereich kann das Einsatzteil 3 an eine nicht dargestellte Versorgungsleitung für die Abriebteilchen angeschlossen werden.The insert 3 can be connected to a supply line (not shown) for the abrasion particles via an end region projecting axially via the lock nut 19.

Das in Strömungsrichtung gesehen hinter dem Einsatzteil 3 liegende Einsatzteil 4 besteht aus einer rohrförmigen Hülse und ist innerhalb des Abschnitts 10 der Längsbohrung 7 mittels einer nicht dargestellten Schraube festgelegt, welche in eine radiale Gewindebohrung 20 des Düsenmantels 2 eingeschraubt wird und gegen die äußere Umfangswand des Einsatzteils 4 drückt.The insert 4 lying in the flow direction behind the insert 3 consists of a tubular sleeve and is fixed within the section 10 of the longitudinal bore 7 by means of a screw, not shown, which is screwed into a radial threaded bore 20 of the nozzle casing 2 and against the outer peripheral wall of the insert 4 presses.

Die Einsatzteile 3, 4 sind so bemessen, daß der Innendurchmesser des Einsatzteils 4 größer als der Innendurchmesser des Einsatzteils 3, jedoch kleiner als dessen Außendurchmesser in einem Endabschnitt 21 ist, welcher dem Einsatzteil 4 benachbart ist und an den Abschnitt 18 des Einsatzteils 3 in Strömungsrichtung anschließt.The insert parts 3, 4 are dimensioned such that the inside diameter of the insert part 4 is larger than the inside diameter of the insert part 3, but smaller than its outside diameter in an end section 21, which is adjacent to the insert part 4 and to the section 18 of the insert part 3 in the flow direction connects.

Das Einsatzteil 3 wird lediglich so weit in den Düsenmantel 2 eingeschraubt, daß sein dem Einsatzteil 4 zugewandtes Ende zum benachbarten Endbereich des Einsatzteils 4 noch einen gewissen Abstand aufweist, so daß zwischen den beiden Einsatzteilen 3,4 ein umlaufender, ringförmiger Spalt vorhanden ist, der eine Flüssigkeitseinströmöffnung 22 für die über den Flüssigkeitseinströmstutzen 5 zugeführte Flüssigkeit darstellt.The insert part 3 is only screwed so far into the nozzle casing 2 that its end facing the insert part 4 still has a certain distance from the adjacent end region of the insert part 4, so that a circumferential, annular gap is present between the two insert parts 3, 4 represents a liquid inflow opening 22 for the liquid supplied via the liquid inflow nozzle 5.

Die Flüssigkeitseinströmöffnung 22 ist im Längsschnitt bogenförmig ausgebildet und wird auf der Seite des Einsatzteils 4 durch eine konvexe Wand 23 begrenzt, die sich von der Stirnseite des Einsatzteils 4 bis zur inneren Umfangswand erstreckt. Auf der Seite des Einsatzteils 3 wird die Flüssigkeitseinströmöffnung 22 durch eine konkave Wand 24 begrenzt, welche etwa die gleiche Krümmung wie die konvexe Wand 23 des Einsatzteils 4 aufweist und an dem dem Einsatzteil 4 zugewandten Ende des Endbereichs 21 vorgesehen ist.The liquid inflow opening 22 is arcuate in longitudinal section and is delimited on the side of the insert 4 by a convex wall 23 which extends from the end of the insert 4 to the inner peripheral wall. On the side of the insert part 3, the liquid inflow opening 22 is delimited by a concave wall 24, which has approximately the same curvature as the convex wall 23 of the insert part 4 and is provided on the end of the end region 21 facing the insert part 4.

Im Bereich ihrer Mündung verläuft die Flüssigkeitseinströmöffnung 22 entlang der inneren Umfangswand des Einsatzteils 4 und parallel zu dieser, so daß die in den Hohlraum 12 einströmende Flüssigkeit eine Strömungsrichtung erhält, die parallel zur inneren Umfangswand des Einsatzteils 4 verläuft. Hierdurch wird an dieser inneren Umfangswand ein Flüssigkeitsmantel erzeugt, der den strahlgutbedingten Verschleiß des Einsatzteils 4 bedeutend herabsetzt.In the region of its mouth, the liquid inflow opening 22 runs along and parallel to the inner peripheral wall of the insert part 4, so that the liquid flowing into the cavity 12 receives a flow direction which runs parallel to the inner peripheral wall of the insert part 4. As a result, a liquid jacket is produced on this inner peripheral wall, which significantly reduces the wear of the insert 4 due to the blasting material.

Die umfangswandparallele Ausrichtung der Flüssigkeitseinströmöffnung 22 kann auf einfache Weise durch einen axialen Vorsprung 25 bewirkt werden, der an die konkave Wand 24 zur Stirnseite des Einsatzteils 3 hin anschließt und mit radialem Abstand in das Einsatzteil 4 einführbar ist. Die äußere Umfangsfläche des Vorsprungs 25 verläuft hierbei parallel zur inneren Umfangsfläche des Einsatzteils 4.The orientation of the liquid inflow opening 22 parallel to the circumferential wall can be effected in a simple manner by an axial projection 25 which connects to the concave wall 24 towards the end face of the insert part 3 and can be inserted into the insert part 4 at a radial distance. The outer circumferential surface of the projection 25 runs parallel here to the inner peripheral surface of the insert part 4.

Die konvexe Wand 23 und/oder die konkave Wand 24 können nicht dargestellte, schrägstehende Stege aufweisen, die der einströmenden Flüssigkeit eine spiralförmige Strömungsrichtung um die Mittelachse 6 herum verleihen.The convex wall 23 and / or the concave wall 24 can have inclined webs, not shown, which give the inflowing liquid a spiral flow direction around the central axis 6.

An ihrem einströmseitigen Ende steht die Flüssigkeitseinströmöffnung 22 mit einer umlaufenden Ringkammer 26 in Verbindung, die radial nach innen durch den Endabschnitt 21 des Einsatzteils 3 und radial nach außen durch den Düsenmantel 2 begrenzt wird. Die Ringkammer 26 ist wiederum mit einer radialen Bohrung 27 des Düsenmantels 2 verbunden, in die ein Befestigungsabschnitt des Flüssigkeitseinströmstutzens 5 eingeführt werden kann. Die Befestigung des Flüssigkeitseinströmstutzens 5 am Düsenmantel 2 kann beispielsweise dadurch erfolgen, daß die Bohrung 27 als Gewindebohrung ausgeführt ist und der Befestigungsabschnitt des Flüssigkeitseinströmstutzens 5 so weit in die Bohrung 27 eingeschraubt wird, bis ein Flansch 28 des Flüssigkeitseinströmstutzens 5 an der Außenfläche des Düsenmantels 2 anliegt.At its inflow end, the liquid inflow opening 22 is connected to a circumferential annular chamber 26 which is delimited radially inwards by the end section 21 of the insert part 3 and radially outwards by the nozzle jacket 2. The annular chamber 26 is in turn connected to a radial bore 27 of the nozzle casing 2, into which a fastening section of the liquid inflow nozzle 5 can be inserted. The attachment of the liquid inflow nozzle 5 to the nozzle jacket 2 can be carried out, for example, in that the bore 27 is designed as a threaded bore and the fastening section of the liquid inflow nozzle 5 is screwed into the bore 27 until a flange 28 of the liquid inflow nozzle 5 rests on the outer surface of the nozzle jacket 2 .

Um zu verhindern, daß Flüssigkeit von der Ringkammer 26 in die Fuge zwischen dem Düsenmantel 2 und dem Einsatzteil 3 bzw. 4 eintritt, sind beiderseits der Ringkammer 26 elastische Dichtungsmittel in der Form von O-Ringen 29 vorgesehen, die in radialen Nuten des Düsenmantels 2 liegen und mit den äußeren Umfangsflächen der Einsatzteile 3, 4 in Dichtkontakt stehen.In order to prevent liquid from the annular chamber 26 from entering the joint between the nozzle casing 2 and the insert part 3 or 4, elastic sealing means in the form of O-rings 29 are provided on both sides of the annular chamber, which are located in radial grooves of the nozzle casing 2 lie and are in sealing contact with the outer peripheral surfaces of the insert parts 3, 4.

In Fig. 2 ist eine Ausführungsvariante der Erfindung beschrieben, bei der die Einströmrichtung der Abriebteilchen durch den Pfeil 30 gekennzeichnet ist.An embodiment variant of the invention is described in FIG. 2, in which the inflow direction of the wear particles is indicated by the arrow 30.

Im Unterschied zu Fig. 1 ist beim Ausführungsbeispiel von Fig.2 nicht das die Einlaßöffnung 13 aufweisende Einsatzteil axial beweglich innerhalb des Düsenmantels 2 angeordnet, sondern das in Strömungsrichtung nachfolgende Einsatzteil. Die entsprechenden Einsatzteile sind in Fig. 2 mit 3', 4' bezeichnet.In contrast to Fig. 1 is in the embodiment of 2 does not have the insert part having the inlet opening 13 axially movable within the nozzle casing 2, but rather the insert part following in the flow direction. The corresponding insert parts are designated 3 ', 4' in FIG. 2.

Die axiale Festlegung des Einsatzteils 4 innerhalb des Düsenmantels 2' erfolgt hier mittels einer Überwurfmutter 31, die mit ihrem axialen Abschnitt 31a auf ein entsprechendes Außengewinde 17' des Düsenmantels 2' aufschraubbar ist und mit einem radial nach innen vorstehenden Abschnitt 31b an einer radialen Schulter 33 anliegt, die im abströmseitigen Endbereich des Einsatzteils 4' und an dessen Außenumfang vorgesehen ist.The axial fixation of the insert part 4 within the nozzle casing 2 'takes place here by means of a union nut 31, which can be screwed with its axial section 31a onto a corresponding external thread 17' of the nozzle casing 2 'and with a section 31b projecting radially inwards on a radial shoulder 33 abuts, which is provided in the downstream end region of the insert 4 'and on its outer circumference.

Hierbei kann es genügen, das Einsatzteil 4' lediglich in Abströmrichtung festzulegen, da das Einsatzteil 4' durch den in der Ringkammer 26 bestehenden Überdruck lediglich in diese Richtung gedrängt wird.It may be sufficient to fix the insert 4 'only in the outflow direction, since the insert 4' is only forced in this direction by the excess pressure in the annular chamber 26.

Ein Dichtungsring 34 zwischen der Überwurfmutter 31 und dem Düsenmantel 2' verhindert, daß Schmutz von außen her in den Spalt zwischen dem Düsenmantel 2' und der Überwurfmutter 31 eindringen und zum Gewinde 32 gelangen kann.A sealing ring 34 between the union nut 31 and the nozzle jacket 2 'prevents dirt from entering the gap between the nozzle jacket 2' and the union nut 31 from outside and reaching the thread 32.

Der übrige Aufbau entspricht im wesentlichen dem Ausführungsbeispiel von Fig. 1.The rest of the structure essentially corresponds to the exemplary embodiment in FIG. 1.

Die Einsatzteile 3, 3', 4, 4' werden günstigerweise aus einem verschleißfesten Material, beispielsweise gehärteten Stahl, hergestellt, während der Mantel 2, 2' aus Aluminium oder Kunststoff bestehen kann.The insert parts 3, 3 ', 4, 4' are advantageously made of a wear-resistant material, for example hardened steel, while the casing 2, 2 'can be made of aluminum or plastic.

Claims (11)

  1. Device for jet treatment, in particular jet cleaning or jet cutting of materials by means of a blasting agent containing in particular granular abrasive particles mixed with a fluid, which device consists of a nozzle (1, 1') with a continuous hollow space (12) which has at one end an inlet opening (13) which is connected to a supply unit feeding the abrasive particles to the nozzle (1, 1') under high pressure, and, at the other end, an outlet opening (14) for the blasting agent, and a fluid inlet orifice (22) arranged between the inlet and outlet opening (13, 14) and connected to a supply line for the fluid, characterised in that the fluid inlet orifice (22) is constructed as a circular gap and delimited by two nozzle elements (3, 3', 4, 4') which can move axially in relation to each other and can be fixed in various axial positions, and the flow cross-section of the fluid inlet orifice (22) can be varied by the relative movement of these nozzle elements (3, 3', 4, 4'), the hollow space (12) being essentially cylindrical, and that, viewed from the front in the direction of flow, one nozzle element (3, 3') ends in a section of constant external diameter that is smaller than that of the one nozzle element (3, 3') following it and smaller than that of the hollow space (12), so that in the region of its narrowing, the fluid inlet orifice (22) is aligned parallel to the wall of the hollow space (12) positioned behind the fluid inlet orifice, viewed in the direction of flow of the blasting agent, and a fluid envelope is formed which protects this wall of the hollow space (12).
  2. Device according to Claim 1, characterised in that, subsequent to the front section of constant external diameter, the one nozzle element (3, 3') has an outer peripheral or front face (24) which, in longitudinal section is straight or arc-shaped, and which, together with an opposing peripheral or front face (23) of the other nozzle element (4, 4'), placed at a distance thereto, delimits the fluid inlet orifice (22), the front section of constant external diameter of the one nozzle element (3, 3') being capable of being inserted, at least partially, into the hollow space (12) of the other nozzle element (4, 4').
  3. Device according to one of the preceding Claims, characterised in that one nozzle element consists of a hollow cylindrical insert (3, 4') which is arranged to move axially inside one nozzle casing (2, 2'), and the other nozzle element consists of either a further hollow cylindrical insert (4, 3') connected in an unmoveable manner to the nozzle casing (2, 2'), which insert is arranged flush with the first insert (3, 4') inside the nozzle casing (2, 2'), or consists of the nozzle casing (2, 2') itself, the hollow space (12) being formed inside the inserts (3, 3', 4, 4') or inside the moveable insert (3, 4'), and the nozzle casing (2, 2').
  4. Device according to one of the preceding Claims, characterised in that the moveable nozzle element (3) has an external thread (17) and can be screwed into a longitudinal bore (7) with internal thread (8) provided in the nozzle casing (2) and, preferably, can be secured by means of a lock nut (19) which can be screwed onto its external thread (17) and can make contact with the nozzle casing (2).
  5. Device according to one of the preceding Claims, characterised in that the moveable nozzle element (4') is arranged in the direction of flow behind the stationary nozzle element (3') and is retained, at least in the direction of flow, by a cap nut (31) which can be screwed onto the nozzle casing (2').
  6. Device according to one of the preceding Claims, characterised in that the fluid inlet orifice (22) is connected to an upstream, continuous toroidal chamber (26) which is preferably formed around a front end region (21) of the rear nozzle element (3, 3') as seen in the direction of flow.
  7. Device according to one of the preceding Claims, characterised in that in order to impart a spiral direction of flow about the central axis (6) of the nozzle (1) to the fluid flowing into the hollow space (12), the nozzle elements (3, 3', 4, 4') are provided with flow guide elements on at least one of the two walls (23, 24) delimiting the fluid inlet orifice (22).
  8. Device according to Claim 7, characterised in that the flow guide elements consist of webs arranged obliquely to the central axis (6) of the nozzle (1, 1') and preferably distributed uniformly around the entire periphery of the fluid inlet orifice (22).
  9. Device according to one of the preceding Claims, characterised in that the rear nozzle element (3, 3'), as seen in the direction of flow, extends approximately to the centre of the nozzle (1) and has a first hollow section with constant circular cross-section that is smaller than a second hollow section with constant circular cross-section, which is provided inside the subsequent nozzle element (4, 4').
  10. Device according to one of the Claims 3 to 9, characterised in that the stationary nozzle element (4, 3') is secured inside the nozzle casing (2, 2') by means of a screw which can be screwed into a radial tapped hole (20) provided in the nozzle casing (2, 2'), and which can be brought into contact with the external peripheral face of the nozzle element (4, 3').
  11. Device according to one of the Claims 3 to 10, characterised in that the nozzle elements (3, 3', 4, 4') consist of a hard material, for example hardened steel, and the nozzle casings (2, 2') consist of a relatively light material, for example aluminium or plastic.
EP93109199A 1992-06-09 1993-06-08 Apparatus for blast machining of material Expired - Lifetime EP0573957B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4218887 1992-06-09
DE4218887A DE4218887C1 (en) 1992-06-09 1992-06-09

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EP0573957A1 EP0573957A1 (en) 1993-12-15
EP0573957B1 true EP0573957B1 (en) 1995-04-26

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Application Number Title Priority Date Filing Date
EP93109199A Expired - Lifetime EP0573957B1 (en) 1992-06-09 1993-06-08 Apparatus for blast machining of material

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EP (1) EP0573957B1 (en)
AT (1) ATE121660T1 (en)
DE (2) DE4218887C1 (en)
DK (1) DK0573957T3 (en)
ES (1) ES2074905T3 (en)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
DE102010051227A1 (en) 2010-11-12 2012-05-16 Dental Care Innovation Gmbh Nozzle for the emission of liquid cleaning agents with abrasive particles dispersed therein

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GB9404763D0 (en) * 1994-03-11 1994-04-27 Guyson Int Ltd An application head for emitting blast media
CZ122796A3 (en) * 1996-04-29 1997-11-12 Jan Ing Strechovsky Method of abrasive cutting and apparatus for making the same
US5921846A (en) * 1997-03-21 1999-07-13 The Johns Hopkins University Lubricated high speed fluid cutting jet
USD825741S1 (en) 2016-12-15 2018-08-14 Water Pik, Inc. Oral irrigator handle

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US1848122A (en) * 1930-02-20 1932-03-08 Alois W Forster Device for use in introducing alpha fluid into alpha conduit for flowing materials
US2176577A (en) * 1937-04-03 1939-10-17 Hydroblast Corp Sandblast device
DE802430C (en) * 1948-09-30 1951-02-12 Hugo Van Der Krans Method and device for sanding objects
US2751716A (en) * 1954-04-19 1956-06-26 Clarence B Pletcher Blast gun
DE1477991A1 (en) * 1965-05-31 1969-07-17 Elektro Veb Device for jet lapping
DE1982295U (en) * 1965-10-30 1968-03-28 Vestische Glashuette G M B H V BLAST GUN FOR BLASTING GLASS BALLS OR OTHER ABRASIVE OR SMOOTHING GRAIN.
CH596956A5 (en) * 1976-09-20 1978-03-31 Erwin Baiker Injection type blasting treatment gun
US4253610A (en) * 1979-09-10 1981-03-03 Larkin Joe M Abrasive blast nozzle
DD220770A3 (en) * 1982-09-01 1985-04-03 Rohrleitungen Isolierungen Veb DEVICE FOR PRESSURE AIR RADIATION
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010051227A1 (en) 2010-11-12 2012-05-16 Dental Care Innovation Gmbh Nozzle for the emission of liquid cleaning agents with abrasive particles dispersed therein
WO2012069894A1 (en) 2010-11-12 2012-05-31 Dental Care Innovation Gmbh Nozzle for blasting liquid detergents with dispersed abrasive particles

Also Published As

Publication number Publication date
EP0573957A1 (en) 1993-12-15
DE59300155D1 (en) 1995-06-01
ES2074905T3 (en) 1995-09-16
DK0573957T3 (en) 1995-10-02
DE4218887C1 (en) 1993-05-19
ATE121660T1 (en) 1995-05-15

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