EP0069875A2 - Abrasive blasting method using air under pressure, and device therefor - Google Patents
Abrasive blasting method using air under pressure, and device therefor Download PDFInfo
- Publication number
- EP0069875A2 EP0069875A2 EP82105336A EP82105336A EP0069875A2 EP 0069875 A2 EP0069875 A2 EP 0069875A2 EP 82105336 A EP82105336 A EP 82105336A EP 82105336 A EP82105336 A EP 82105336A EP 0069875 A2 EP0069875 A2 EP 0069875A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- blasting
- air flow
- area
- additive
- air stream
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000005270 abrasive blasting Methods 0.000 title 1
- 239000000654 additive Substances 0.000 claims abstract description 35
- 230000000996 additive effect Effects 0.000 claims abstract description 35
- 230000001133 acceleration Effects 0.000 claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 4
- 238000005422 blasting Methods 0.000 claims description 66
- 239000003795 chemical substances by application Substances 0.000 claims description 23
- 239000007788 liquid Substances 0.000 claims description 10
- 238000002347 injection Methods 0.000 claims description 5
- 239000007924 injection Substances 0.000 claims description 5
- 238000009736 wetting Methods 0.000 claims 1
- 239000012159 carrier gas Substances 0.000 abstract 4
- 239000007789 gas Substances 0.000 abstract 2
- 239000000126 substance Substances 0.000 abstract 2
- 238000005488 sandblasting Methods 0.000 abstract 1
- 230000003068 static effect Effects 0.000 description 5
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 230000000153 supplemental effect Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C7/00—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts
- B24C7/0084—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts the abrasive material being fed in a mixture of liquid and gas
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C7/00—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts
- B24C7/0046—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts the abrasive material being fed in a gaseous carrier
Definitions
- the invention relates to a method for compressed air blasting, in which a granular blasting agent is introduced into a carrier air stream and conveyed by the carrier air stream, accelerated and blown against a surface to be treated, and the loaded carrier air stream is filled with a preferably liquid additive, in particular water, which wets the blasting agent.
- loaded additional air stream is added, in particular is injected into the carrying air stream loaded with the blasting agent, - and a blasting device for performing this method.
- the blasting medium is moistened by adding the additional air stream laden with a liquid additive (cf. DE-OS 2724 318).
- a liquid additive cf. DE-OS 2724 318.
- This moistening can be metered in such a way that the amount of the liquid additive added is just sufficient to bind the developing dust or to prevent, or at least reduce, the development of dust when the abrasive hits the surface to be treated.
- the amount of additive added is not so large that the additive is deposited on the surface to be treated and runs off from it.
- the known method described above can thus be located between "dry blasting", ie compressed air blasting with dry sand, for example, and between "wet blasting" and is referred to as "wet blasting".
- the addition of the additional air stream laden with the liquid additive takes place at a nozzle constriction of the nozzle area of the blasting device with which this method is carried out.
- the air flow has its highest speed and therefore its lowest static pressure. This low static pressure is used to draw in the additional air flow. This makes it extremely easy to add the additional air stream loaded with the additive; however, it cannot be controlled to the extent necessary.
- Compressed air blasting strives for the highest possible speed of impact of the blasting medium on the surface to be treated.
- the jet transported in a supply line by means of flight promotion through the air flow medium is entrained in the nozzle area of the blasting machine, in which the static pressure of the air flow is converted as far as possible into kinetic energy by the air flow accelerated in this way, whereby the blasting agent should reach a speed that is as close as possible to the area! air flow rate.
- the air flow is accelerated much more than the blasting medium carried by it.
- One tries to counteract this effect for example, by converting the static pressure of the air flow into kinetic energy over a relatively long way in which the nozzle area has a relatively long constriction area. But even if a relatively long acceleration path in the form of a long constriction area is provided, the speed of the blasting agent remains significantly behind the speed of the air flow. The speed of the blasting medium is further reduced by the fact that the blasting medium, due to the liquid additive with which it is moistened, increases its mass, so that its actual acceleration is reduced even further
- a disadvantage of the known method described above is in particular that the location of the addition of the additive conveyed with the additional air flow is at a point in the nozzle area of the blasting device in which a great acceleration of the blasting agent can be achieved at the same time Time available with the additive very short; the desired, completely closed coating of the blasting agent with the liquid additive is not achieved under these circumstances. Accordingly, the dust binding on the surface to be treated is not always satisfactory unless an "overdose" of additive is used.
- the object of the invention is now to improve the method of the type described above and the blasting apparatus working according to this method to the extent that on the one hand a targeted, well controllable and complete order coating of the blasting agent with the preferably liquid additive is possible with the smallest amount of this additive, but on the other hand the acceleration of the blasting agent is influenced as little as possible by the addition of the additive.
- the method according to the invention in which the above-mentioned object is achieved, is initially characterized in that the addition of the additional air stream laden with the additive takes place in a local area of the laden carrier air stream in which the speed and the acceleration of the blasting medium is low.
- the location at which the blasting agent is accelerated by the carrier air stream and the location at which the addition of the additional air stream loaded with the additive takes place are spatially separated from one another. This ensures that the addition of the additive does not interfere with the acceleration process and vice versa, so that the two processes, that is to say both the acceleration and the addition of the additive, can be optimally designed for themselves.
- the addition of the additive takes place before the actual acceleration of the blasting medium, the blasting medium has already experienced a mass increase due to moistening when it enters the actual acceleration path and the blasting medium is accelerated in the moistened state. Since the acceleration takes place undisturbed by external influences, the greatest possible acceleration of the previously moistened abrasive is achieved. In particular, however, there are manageable conditions with regard to the trajectory of the blasting medium at the local area of the additional air flow at which, according to the invention, the addition of the additional air flow loaded with the additive is to take place, so that the moistening of the blasting medium can take place much more precisely than in the area of the nozzle constriction .
- the teaching of the invention thus enables an advantageous decoupling of moistening and accelerating, an optimal control of the two processes without mutual interaction, a more precise moistening of the blasting agent and an improved speed of impact of the blasting agent on the surface to be treated.
- the addition of the additional air stream laden with the additive advantageously takes place at the beginning of the acceleration path of the blasting medium.
- acceleration of the blasting medium there has already been a certain, but only slight, acceleration of the blasting medium, so that backflow of the following blasting medium due to the moistening of the blasting medium is avoided and clogging is prevented.
- the blasting agent in the injection area is given an inherent rotation and / or a rotary movement relative to the direction of flow of the carrier air stream, in particular a helical rotary movement. This facilitates all-round coating of the blasting medium with the additive.
- the intrinsic rotation of the blasting agent or the rotational movement of the blasting agent relative to the direction of flow of the carrier air stream can be caused in a simple manner by adding the additional air stream off-center.
- a blasting device suitable for carrying out the method according to the invention, with a nozzle area having at least one constriction area is characterized in that the local area of the addition of the additional air stream loaded with the additive is formed at the beginning of the constriction area of the nozzle area.
- the addition is carried out of the laden with the additive supplemental air flow through a slot, which includes an angle of 45 o with the axis of the nozzle portion and is located at a distance of one quarter of the total length of the throat region from the inlet end of the throat region.
- a granular abrasive 2 is supplied to the blasting device through a feed line by means of flight promotion in a carrier air stream, the blasting device having a nozzle area 3; the direction of movement of the blasting medium 2 is indicated by an arrow 4.
- the nozzle area 3 of the blasting device essentially consists of an elongated, approximately 75 cm long narrowing area 5 and an adjoining extension area 6, which is approximately two and a half times the length of the narrowing area 5; the constriction area 5 and the expansion area 6 are conical, they merge into one another in the area of the smallest cross section of the nozzle area 3, the nozzle constriction 7.
- the static pressure of the carrier air stream conveying the blasting medium 2 is converted into kinetic energy in the constriction region 5 of the nozzle region 3; the accelerated air flow entrains the blasting medium 2, so that the blasting medium 2 also experiences an acceleration in the constriction region 5 of the nozzle region 3.
- an additional air flow is added to the carrier air stream loaded with the blasting agent 2 via a slot 8, which is loaded with a liquid additive, in particular water.
- the loaded auxiliary air stream is passed via a connection piece 9, and a - not shown - supply line under pressure into an annular chamber 10 fed from where it is injected at an angle of about 45 0 to the direction of flight of the blasting medium through the slot 8 in the loaded with the blasting medium 2 supporting air stream becomes.
- the dynamic pressure of the additional air flow is approximately twice as high as the dynamic pressure of the supporting air flow, so that the additional air flow can completely penetrate the supporting air flow. This ensures that the blasting agent 2 can be wetted uniformly and in a metered manner with the liquid additive.
- the local area of the addition of the additional air flow into the air flow is approximately a quarter of the total length of the constriction area 5 of the nozzle area 3; the blasting agent 2 has therefore only experienced about a quarter of the acceleration that it experiences on the way to the nozzle constriction 7 of the nozzle region 3.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Nozzles (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Treatments Of Macromolecular Shaped Articles (AREA)
- Mechanical Treatment Of Semiconductor (AREA)
- Processing Of Solid Wastes (AREA)
- Air Transport Of Granular Materials (AREA)
- Glanulating (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zum Druckluftstrahlen, wobei ein körniges Strahlmittel in einen Tragluftstrom eingebracht und durch den Tragluftstrom gefördert, beschleunigt und gegen eine zu behandelnde Oberfläche geblasen wird und dem beladenen Tragluftstrom ein mit einem vorzugsweise flüssigen, vorzugsweise das Strahlmittel benetzenden Zusatzstoff, insbesondere Wasser, beladener Zusatzluftstrom zugegeben wird, insbesondere in den mit dem Strahlmittel beladenen Tragluftstrom injiziert wird, - sowie ein Strahlgerät zur Durchführung dieses Verfahrens.The invention relates to a method for compressed air blasting, in which a granular blasting agent is introduced into a carrier air stream and conveyed by the carrier air stream, accelerated and blown against a surface to be treated, and the loaded carrier air stream is filled with a preferably liquid additive, in particular water, which wets the blasting agent. loaded additional air stream is added, in particular is injected into the carrying air stream loaded with the blasting agent, - and a blasting device for performing this method.
Bei einem bekannten Verfahren der zuvor beschriebenen Art wird durch Zugabe des mit einem flüssigen Zusatzstoff beladenen Zusatzluftstroms ein Anfeuchten des Strahlmittels erreicht (vgl. die DE-OS 2724 318). Dieses Anfeuchten kann so dosiert werden, daß die Menge des zugegebenen flüssigen Zusatzstoffs gerade ausreicht, um beim Auftreffen des Strahlmittels auf die zu behandelnde Oberfläche den sich entwickelnden Staub zu binden bzw. die Entwicklung von Staub zu verhindern, zumindest aber zu reduzieren. Die zugegebene Menge an Zusatzstoff ist jedoch nicht so groß, daß der Zusatzstoff auf der zu behandelnden Oberfläche niederschlägt und von dieser abrinnt. Das zuvor beschriebene bekannte Verfahren ist somit zwischen einem "Trockenstrahlen", also Druckluftstrahlen beispielsweise mit trockenem Sand, und zwischen einem "Naßstrahlen" anzusiedeln und wird als "Feuchtstrahlen" bezeichnet.In a known method of the type described above, the blasting medium is moistened by adding the additional air stream laden with a liquid additive (cf. DE-OS 2724 318). This moistening can be metered in such a way that the amount of the liquid additive added is just sufficient to bind the developing dust or to prevent, or at least reduce, the development of dust when the abrasive hits the surface to be treated. However, the amount of additive added is not so large that the additive is deposited on the surface to be treated and runs off from it. The known method described above can thus be located between "dry blasting", ie compressed air blasting with dry sand, for example, and between "wet blasting" and is referred to as "wet blasting".
Bei dem bekannten Verfahren, von dem die Erfindung ausgeht, erfolgt die Zugabe des mit dem flüssigen Zusatzstoff beladenen Zusatzluftstroms an einer Düsenengstelle des Düsenbereichs des Strahlgerätes, mit dem dieses Verfahren durchgeführt wird. Hier hat der Tragluftstrom seine höchste Geschwindigkeit und somit seinen geringsten statischen Druck. Dieser geringe statische Druck wird genutzt, um den Zusatzluftstrom anzusaugen. Dadurch wird die Zugabe des mit dem Zusatzstoff beladenen Zusatzluftstroms ausgesprochen einfach; sie läßt sich aber nicht im erforderlichen Maße steuern.In the known method from which the invention is based, the addition of the additional air stream laden with the liquid additive takes place at a nozzle constriction of the nozzle area of the blasting device with which this method is carried out. Here the air flow has its highest speed and therefore its lowest static pressure. This low static pressure is used to draw in the additional air flow. This makes it extremely easy to add the additional air stream loaded with the additive; however, it cannot be controlled to the extent necessary.
Beim Druckluftstrahlen wird eine möglichst hohe Auftreffgeschwindigkeit des Strahlmittels auf die zu behandelnde Oberfläche angestrebt. Das in einer Zuleitung mittels Flugförderung durch den Tragluftstrom transportierte Strahlmittel wird im Düsenbereich des Strahlgerätes, in dem der statische Druck des Tragluftstroms möglichst weitgehend in kinetische Energie umgesetzt wird durch den so beschleunigten Tragluftstrom mitgerissen, wobei das Strahlmittel eine Geschwindigkeit erreichen soll, die möglichst im Bereich der Ge- ! schwindigkeit des Tragluftstroms liegt.Compressed air blasting strives for the highest possible speed of impact of the blasting medium on the surface to be treated. The jet transported in a supply line by means of flight promotion through the air flow medium is entrained in the nozzle area of the blasting machine, in which the static pressure of the air flow is converted as far as possible into kinetic energy by the air flow accelerated in this way, whereby the blasting agent should reach a speed that is as close as possible to the area! air flow rate.
Aufgrund der unterschiedlichen spezifischen Gewichte des Tragluftstroms und des Strahlmittels wird der Tragluftstrom jedoch ungleich stärker beschleunigt als das von ihm mitgeführte Strahlmittel. Diesem Effekt.versucht man beispielsweise dadurch entgegenzuwirken, daß die Umwandlung des statischen Drucks des Tragluftstroms in kinetische Energie auf einem relativ langen Weg erfolgt, in dem der Düsenbereich einen relativ lang ausgebildeten Verengungsbereich aufweist. Aber auch dann, wenn eine relativ lang ausgebildete Beschleunigungsstrecke in Form.eines langen Verengungsbereichs vorgesehen wird, bleibt die Geschwindigkeit des Strahlmittels deutlich hinter der Geschwindigkeit des Tragluftstroms zurück. Die Geschwindigkeit des Strahlmittels wird weiterhin dadurch vermindert, daß das Strahlmittel aufgrund de flüssigen Zusatzstoffs, mit dem es angefeuchtet wird, einen Massenzuwachs e-fährt, so daß seine tatsächliche Beschleunigung noch weiter verringert wirdHowever, due to the different specific weights of the air flow and the blasting medium, the air flow is accelerated much more than the blasting medium carried by it. One tries to counteract this effect, for example, by converting the static pressure of the air flow into kinetic energy over a relatively long way in which the nozzle area has a relatively long constriction area. But even if a relatively long acceleration path in the form of a long constriction area is provided, the speed of the blasting agent remains significantly behind the speed of the air flow. The speed of the blasting medium is further reduced by the fact that the blasting medium, due to the liquid additive with which it is moistened, increases its mass, so that its actual acceleration is reduced even further
Nachteilig bei dem bekannten, zuvor beschriebenen Verfahren ist insbesonder daß sich der Ort der Zugabe des mit dem Zusatzluftstrom herangeförderten Zu satzstoffs an einer Stelle des Düsenbereichs des Strahlgeräts befindet, in dem zugleich eine große Beschleunigung des Strahlmittels erreicht werden so Dadurch ist die für das Benetzen des Strahlmittels mit dem Zusatzstoff zur Verfügung stehende Zeit sehr kurz; die erwünschte, vollständig geschlossene Umhüllung des Strahlmittels mit dem flüssigen Zusatzstoff wird unter diesen Umständen nicht erreicht. Demzufolge ist auch die Staubbindung an der zu be handelnden Oberfläche nicht immer zufriedenstellend, falls nicht mit einer "Überdosis" an Zusatzstoff gearbeitet wird.A disadvantage of the known method described above is in particular that the location of the addition of the additive conveyed with the additional air flow is at a point in the nozzle area of the blasting device in which a great acceleration of the blasting agent can be achieved at the same time Time available with the additive very short; the desired, completely closed coating of the blasting agent with the liquid additive is not achieved under these circumstances. Accordingly, the dust binding on the surface to be treated is not always satisfactory unless an "overdose" of additive is used.
Aufgabe der Erfindung ist es nun, das Verfahren der eingangs beschriebenen Art und das nach diesem Verfahren arbeitende Strahlgerät dahingehend zu ver bessern, daß einerseits eine gezielte, gut steuerbare und vollständige Umhüllung des Strahlmittels mit dem vorzugsweise flüssigen Zusatzstoff bei geringster Menge dieses Zusatzstoffs möglich ist, andererseits aber die Beschleunigung des Strahlmittels durch den Tragluftstrom möglichst wenig durch die Zugabe des Zusatzstoffs beeinflußt wird.The object of the invention is now to improve the method of the type described above and the blasting apparatus working according to this method to the extent that on the one hand a targeted, well controllable and complete order coating of the blasting agent with the preferably liquid additive is possible with the smallest amount of this additive, but on the other hand the acceleration of the blasting agent is influenced as little as possible by the addition of the additive.
Das erfindungsgemäße Verfahren, bei dem die zuvor aufgezeigte Aufgabe gelöst ist, ist zunächst dadurch gekennzeichnet, daß die Zugabe des mit dem Zusatzstoff beladenen Zusatzluftstroms in einem örtlichen Bereich des beladenen Tragluftstroms erfolgt, in dem die Geschwindigkeit und die Beschleunigung des Strahlmittels gering ist. Erfindungsgemäß werden also der Ort, an dem die Beschleunigung des Strahlmittels durch den Tragluftstrom erfolgt, und der Ort, an dem die Zugabe des mit dem Zusatzstoff beladenen Zusatzluftstroms erfolgt, räumlich voneinander getrennt. Dadurch wird erreicht, daß die Zugabe des Zusatzstoffs nicht den Beschleunigungsvorgang stört und umgekehrt, so daß die beiden Vorgänge, 'also sowohl die Beschleunigung als auch die Zugabe des Zusatzstoffs, für sich optimal ausgelegt werden können.The method according to the invention, in which the above-mentioned object is achieved, is initially characterized in that the addition of the additional air stream laden with the additive takes place in a local area of the laden carrier air stream in which the speed and the acceleration of the blasting medium is low. According to the invention, the location at which the blasting agent is accelerated by the carrier air stream and the location at which the addition of the additional air stream loaded with the additive takes place are spatially separated from one another. This ensures that the addition of the additive does not interfere with the acceleration process and vice versa, so that the two processes, that is to say both the acceleration and the addition of the additive, can be optimally designed for themselves.
Da erfindungsgemäß die Zugabe des Zusatzstoffs zeitlich vor der eigentlichen Beschleunigung des Strahlmittels erfolgt, hat das Strahlmittel bereits beim Eintritt in die eigentliche Beschleunigungsstrecke den Massenzuwachs aufgrund des Anfeuchtens erfahren und wird das Strahlmittel im angefeuchteten Zustand beschleunigt. Da die Beschleunigung ungestört durch äußere Einflüsse abläuft, wird die größtmögliche Beschleunigung des zuvor angefeuchteten Strahlmittels erzielt. Insbesondere herrschen aber an dem örtlichen Bereich des Zusatzluftstroms, an dem erfindungsgemäß die Zugabe des mit dem Zusatzstoff beladenen Zusatzluftstroms erfolgen soll, überschaubare Verhältnisse hinsichtlich der Flugbahn des Strahlmittels, so daß an dieser Stelle das Anfeuchten des Strahlmittels wesentlich präziser erfolgen kann als im Bereich der Düsenengstelle. Die Lehre der Erfindung ermöglicht also eine vorteilhafte Entkopplung von Anfeuchten und Beschleunigen, ein optimales Steuern der beiden Vorgänge ohne gegenseitige Wechselwirkung, ein präziseres Anfeuchten des Strahlmittels und eine verbesserte Auftreffgeschwindigkeit des Strahlmittels auf die zu behandelnde Oberfläche.Since, according to the invention, the addition of the additive takes place before the actual acceleration of the blasting medium, the blasting medium has already experienced a mass increase due to moistening when it enters the actual acceleration path and the blasting medium is accelerated in the moistened state. Since the acceleration takes place undisturbed by external influences, the greatest possible acceleration of the previously moistened abrasive is achieved. In particular, however, there are manageable conditions with regard to the trajectory of the blasting medium at the local area of the additional air flow at which, according to the invention, the addition of the additional air flow loaded with the additive is to take place, so that the moistening of the blasting medium can take place much more precisely than in the area of the nozzle constriction . The teaching of the invention thus enables an advantageous decoupling of moistening and accelerating, an optimal control of the two processes without mutual interaction, a more precise moistening of the blasting agent and an improved speed of impact of the blasting agent on the surface to be treated.
Vorteilhafterweise erfolgt bei dem erfindungsgemäßen Verfahren die Zugabe des mit dem Zusatzstoff beladenen Zusatzluftstroms am Beginn der Beschleunigungsstrecke des Strahlmittels. An dieser Stelle hat bereits eine gewisse, jedoch nur kleine Beschleunigung des Strahlmittels stattgefunden, so daß ein Rückstau des nachfolgenden Strahlmittels aufgrund des Anfeuchtens des Strahlmittels vermieden und ein Verstopfen verhindert wird.In the method according to the invention, the addition of the additional air stream laden with the additive advantageously takes place at the beginning of the acceleration path of the blasting medium. At this point, there has already been a certain, but only slight, acceleration of the blasting medium, so that backflow of the following blasting medium due to the moistening of the blasting medium is avoided and clogging is prevented.
Nach einer weiteren Lehre der Erfindung, der besondere Bedeutung zukommt, wird dem Strahlmittel im Injektionsbereich eine Eigendrehung und/oder eine Drehbewegung relativ zur Strömungsrichtung des Tragluftstroms, insbesondere eine schraubenlinienförmige Drehbewegung, gegeben. Dadurch wird eine allseitige Umhüllung des Strahlmittels mit dem Zusatzstoff erleichtert. Die Eigendrehung des Strahlmittels bzw. die Drehbewegung des Strahlmittels relativ zur Strömungsrichtung des Tragluftstroms kann in einfacher Weise durch eine außermittig erfolgende Zugabe des Zusatzluftstroms hervorgerufen werden.According to a further teaching of the invention, which is of particular importance, the blasting agent in the injection area is given an inherent rotation and / or a rotary movement relative to the direction of flow of the carrier air stream, in particular a helical rotary movement. This facilitates all-round coating of the blasting medium with the additive. The intrinsic rotation of the blasting agent or the rotational movement of the blasting agent relative to the direction of flow of the carrier air stream can be caused in a simple manner by adding the additional air stream off-center.
Ein zur Durchführung des erfindungsgemäßen Verfahrens geeignetes Strahlgerät, mit einem zumindest einen Verengungsbereich aufweisenden Düsenbereich, ist dadurch gekennzeichnet, daß der örtliche Bereich der Zugabe des mit dem Zusatzstoff beladenen Zusatzluftstroms am Beginn des Verengungsbereichs des Düsenbereichs ausgebildet ist. Vorzugsweise erfolgt die Zugabe des mit dem Zusatzstoff beladenen Zusatzluftstroms über einen Schlitz, der mit der Achse des Düsenbereichs einen Winkel von 45o einschließt und sich in einer Entfernung von einem Viertel der Gesamtlänge des Verengungsbereichs vom Eintrittsende des Verengungsbereichs befindet.A blasting device suitable for carrying out the method according to the invention, with a nozzle area having at least one constriction area, is characterized in that the local area of the addition of the additional air stream loaded with the additive is formed at the beginning of the constriction area of the nozzle area. Preferably, the addition is carried out of the laden with the additive supplemental air flow through a slot, which includes an angle of 45 o with the axis of the nozzle portion and is located at a distance of one quarter of the total length of the throat region from the inlet end of the throat region.
Im folgenden wird die Erfindung anhand einer lediglich ein Ausführungsbeispiel darstellenden Zeichnung nochmals erläutert; die einzige Figur zeigt, teilweise in einem Längsschnitt, eine bevorzugte Ausführungsform eines Strah gerätes für das erfindungsgemäße Verfahren.In the following, the invention will be explained again with reference to a drawing that shows only one exemplary embodiment; the single figure shows, partly in a longitudinal section, a preferred embodiment of a jet device for the method according to the invention.
Dem Strahlgerät wird durch eine Zuleitung 1 mittels Flugförderung ein körniges Strahlmittel 2 in einem Tragluftstrom zugeführt, - wobei das Strahlgerät einen Düsenbereich 3 aufweist; die Bewegungsrichtung des Strahlmittels 2 ist durch einen Pfeil 4 angedeutet. Der Düsenbereich 3 des Strahlgerätes besteht im wesentlichen aus einem langgestreckten, etwa 75 cm langen Verengungsbereich 5 und einem sich daran anschließenden Erweiterungsbereich 6, der etwa die zweieinhalbfache Länge des Verengungsbereichs 5 hat; der Verengungsbereich 5 und der Erweiterungsbereich 6 sind konisch ausgebildet, sie gehen im Bereich des kleinsten Querschnitts des Düsenbereichs 3, der Düsenengstelle 7, ineinander über.A
Bei dem dargestellten Strahlgerät wird der statische Druck des das Strahlmittel 2 fördernden Tragluftstroms im Verengungsbereich 5 des Düsenbereichs 3 in kinetische Energie umgesetzt; der beschleunigte Tragluftstrom reißt das Strahlmittel 2 mit, so daß auch das Strahlmittel 2 im Verengungsbereich 5 des Düsenbereichs 3 eine Beschleunigung erfährt.In the blasting device shown, the static pressure of the carrier air stream conveying the
Erfindungsgemäß wird im Anfangsbereich der durch den Verengungsbereich 5 des Düsenbereichs 3 gebildeten Beschleunigungsstrecke dem mit dem Strahlmittel 2 beladenen Tragluftstrom über einen Schlitz 8 ein Zusatzluftstrom zugegeben, der mit einem flüssigen Zusatzstoff, insbesondere Wasser, beladen ist. Der beladene Zusatzluftstrom wird über einen Anschlußstutzen 9 und eine - nicht dargestellte - Zuleitung unter Druck in eine Ringkammer 10 eingespeist, von wo er unter einem Winkel von etwa 450 zur Flugrichtung des Strahlmittels durch den Schlitz 8 in den mit dem Strahlmittel 2 beladenen Tragluftstrom injiziert wird. Im Injektionsbereich ist der Staudruck des Zusatzluftstroms etwa doppelt so hoch wie der Staudruck des Tragluftstroms, so daß der Zusatzluftstrom den Tragluftstrom vollständig durchdringen kann. Dadurch wird erreicht, daß das Strahlmittel 2 gleichmäßig und dosiert mit dem flüssigen Zusatzstoff benetzt werden kann.According to the invention, in the initial region of the acceleration section formed by the
Im dargestellten Ausführungsbeispiel liegt der örtliche Bereich der Zugabe des Zusatzluftstroms in den Tragluftstrom bei etwa einem Viertel- der Gesamtlänge des Verengungsbereichs 5 des Düsenbereichs 3; das Strahlmittel 2 hat also etwa erst ein Viertel der Beschleunigung erfahren, die es insgesamt auf dem Weg bis zur Düsenengstelle 7 des Düsenbereichs 3 erfährt.In the exemplary embodiment shown, the local area of the addition of the additional air flow into the air flow is approximately a quarter of the total length of the
Claims (8)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT82105336T ATE10595T1 (en) | 1981-07-09 | 1982-06-18 | PROCEDURE FOR COMPRESSED AIR BLASTING AND BLASTING EQUIPMENT FOR PERFORMING THE PROCESS. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19813127013 DE3127013A1 (en) | 1981-07-09 | 1981-07-09 | METHOD FOR COMPRESSED AIR JET, AND JET FOR IMPLEMENTING THE METHOD |
| DE3127013 | 1981-07-09 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0069875A2 true EP0069875A2 (en) | 1983-01-19 |
| EP0069875A3 EP0069875A3 (en) | 1983-04-06 |
| EP0069875B1 EP0069875B1 (en) | 1984-12-05 |
Family
ID=6136440
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP82105336A Expired EP0069875B1 (en) | 1981-07-09 | 1982-06-18 | Abrasive blasting method using air under pressure, and device therefor |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP0069875B1 (en) |
| JP (1) | JPS6029540B2 (en) |
| KR (1) | KR840000282A (en) |
| AT (1) | ATE10595T1 (en) |
| DE (2) | DE3127013A1 (en) |
| GR (1) | GR76182B (en) |
| PT (1) | PT75184B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0110529A2 (en) * | 1982-10-22 | 1984-06-13 | Flow Industries Inc. | High velocity fluid abrasive jet |
| EP0171448A1 (en) * | 1984-08-14 | 1986-02-19 | Johann Szücs | Device and method for cleaning of stone and metal surfaces |
| US4648215A (en) * | 1982-10-22 | 1987-03-10 | Flow Industries, Inc. | Method and apparatus for forming a high velocity liquid abrasive jet |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3415174A1 (en) * | 1984-04-21 | 1985-10-31 | Ernst Peiniger GmbH Unternehmen für Bautenschutz, 4300 Essen | Process for abrasive blasting using compressed air |
| JPS6243655U (en) * | 1985-09-02 | 1987-03-16 |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2376616A (en) * | 1944-01-18 | 1945-05-22 | Metalweld Inc | Sandblasting apparatus |
| USRE23064E (en) * | 1948-12-14 | Method and apparatus for | ||
| CH302642A (en) * | 1952-07-23 | 1954-10-31 | Rosset Paul | Sandblasting process and gun for implementing this process. |
| GB774624A (en) * | 1955-05-10 | 1957-05-15 | John Alexander Johnson | Improvements in or relating to devices for producing jets of sand or like granular or powder material |
| US3344558A (en) * | 1965-07-23 | 1967-10-03 | Wyatt S Kirkland | Sand blast nozzle |
| GB1571508A (en) * | 1977-02-17 | 1980-07-16 | Kelsall T | Wet blast cleaning |
-
1981
- 1981-07-09 DE DE19813127013 patent/DE3127013A1/en not_active Withdrawn
-
1982
- 1982-06-18 DE DE8282105336T patent/DE3261457D1/en not_active Expired
- 1982-06-18 EP EP82105336A patent/EP0069875B1/en not_active Expired
- 1982-06-18 AT AT82105336T patent/ATE10595T1/en active
- 1982-06-23 GR GR68523A patent/GR76182B/el unknown
- 1982-06-30 KR KR1019820002929A patent/KR840000282A/en unknown
- 1982-07-05 PT PT75184A patent/PT75184B/en not_active IP Right Cessation
- 1982-07-07 JP JP57117047A patent/JPS6029540B2/en not_active Expired
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| USRE23064E (en) * | 1948-12-14 | Method and apparatus for | ||
| US2376616A (en) * | 1944-01-18 | 1945-05-22 | Metalweld Inc | Sandblasting apparatus |
| CH302642A (en) * | 1952-07-23 | 1954-10-31 | Rosset Paul | Sandblasting process and gun for implementing this process. |
| GB774624A (en) * | 1955-05-10 | 1957-05-15 | John Alexander Johnson | Improvements in or relating to devices for producing jets of sand or like granular or powder material |
| US3344558A (en) * | 1965-07-23 | 1967-10-03 | Wyatt S Kirkland | Sand blast nozzle |
| GB1571508A (en) * | 1977-02-17 | 1980-07-16 | Kelsall T | Wet blast cleaning |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0110529A2 (en) * | 1982-10-22 | 1984-06-13 | Flow Industries Inc. | High velocity fluid abrasive jet |
| EP0110529A3 (en) * | 1982-10-22 | 1985-10-16 | Flow Industries Inc. | High velocity fluid abrasive jet |
| US4648215A (en) * | 1982-10-22 | 1987-03-10 | Flow Industries, Inc. | Method and apparatus for forming a high velocity liquid abrasive jet |
| EP0171448A1 (en) * | 1984-08-14 | 1986-02-19 | Johann Szücs | Device and method for cleaning of stone and metal surfaces |
| US4716690A (en) * | 1984-08-14 | 1988-01-05 | Szuecs Johan | Apparatus and method for cleaning stone and metal surfaces |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5861855A (en) | 1983-04-13 |
| JPS6029540B2 (en) | 1985-07-11 |
| KR840000282A (en) | 1984-02-18 |
| DE3261457D1 (en) | 1985-01-17 |
| EP0069875B1 (en) | 1984-12-05 |
| PT75184B (en) | 1984-05-28 |
| ATE10595T1 (en) | 1984-12-15 |
| EP0069875A3 (en) | 1983-04-06 |
| DE3127013A1 (en) | 1983-01-27 |
| GR76182B (en) | 1984-08-03 |
| PT75184A (en) | 1982-08-01 |
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