EP0069874B1 - Abrasive blasting method using air under pressure - Google Patents
Abrasive blasting method using air under pressure Download PDFInfo
- Publication number
- EP0069874B1 EP0069874B1 EP82105335A EP82105335A EP0069874B1 EP 0069874 B1 EP0069874 B1 EP 0069874B1 EP 82105335 A EP82105335 A EP 82105335A EP 82105335 A EP82105335 A EP 82105335A EP 0069874 B1 EP0069874 B1 EP 0069874B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- air
- jet
- additional
- blasting
- pressure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000000034 method Methods 0.000 title claims description 22
- 238000005270 abrasive blasting Methods 0.000 title 1
- 238000005422 blasting Methods 0.000 claims description 43
- 238000002347 injection Methods 0.000 claims description 15
- 239000007924 injection Substances 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 238000007664 blowing Methods 0.000 claims 1
- 239000011344 liquid material Substances 0.000 claims 1
- 239000000126 substance Substances 0.000 claims 1
- 239000000654 additive Substances 0.000 abstract description 28
- 230000000996 additive effect Effects 0.000 abstract description 28
- 239000007788 liquid Substances 0.000 abstract description 15
- 238000005488 sandblasting Methods 0.000 abstract description 3
- 238000009736 wetting Methods 0.000 abstract description 3
- 239000007789 gas Substances 0.000 abstract 7
- 239000012159 carrier gas Substances 0.000 abstract 4
- 239000002245 particle Substances 0.000 abstract 3
- 239000007787 solid Substances 0.000 abstract 2
- 239000000203 mixture Substances 0.000 abstract 1
- 239000000725 suspension Substances 0.000 abstract 1
- 239000003795 chemical substances by application Substances 0.000 description 9
- 239000000428 dust Substances 0.000 description 6
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 238000002156 mixing Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 2
- 208000028571 Occupational disease Diseases 0.000 description 1
- 239000006061 abrasive grain Substances 0.000 description 1
- 238000000889 atomisation Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000009172 bursting Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 210000004072 lung Anatomy 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000000080 wetting agent Substances 0.000 description 1
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
- B24C11/00—Selection of abrasive materials or additives for abrasive blasts
- B24C11/005—Selection of abrasive materials or additives for abrasive blasts of additives, e.g. anti-corrosive or disinfecting agents in solid, liquid or gaseous form
-
- 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 abrasive is introduced into a carrier air stream and conveyed by the carrier air stream, accelerated and blown against a surface to be treated, and a supplementary air stream loaded with a liquid additive wetting the grains of the blasting agent, in particular water is added with the air stream loaded with the blasting agent, in particular injected into the air stream loaded with the blasting agent.
- a method for compressed air blasting in which a granular abrasive is introduced into a carrier air stream and conveyed by the carrier air stream, accelerated and blown against a surface to be treated, and a supplementary air stream loaded with a liquid additive wetting the grains of the blasting agent, in particular water is added with the air stream loaded with the blasting agent, in particular injected into the air stream loaded with the blasting agent.
- wet blasting In the known method for compressed air blasting described above, so-called wet blasting is sought; the individual grains of the blasting medium should be coated with the additive in such a way that the dust which develops when it hits the surface to be treated due to bursting grains of the blasting medium is bound.
- the aim of the known process is thus a process formerly known as sandblasting and now often known as free blasting, which is neither dry blasting nor wet blasting due to the coating of the grains of the blasting medium with the additive, but rather is to be found in the intermediate area between the two processes.
- the addition of the additive, in particular water, is carried out in such a way that, on the one hand, the coating of the individual grains of the blasting medium has practically evaporated after impact, so that no additive runs off, but on the other hand the low coating of the grains of the blasting medium is sufficient to prevent dust formation largely suppressed, so that contributes to occupational safety because the risk of the typical occupational disease dust lung is significantly reduced.
- the known method is characterized by a low water consumption and can therefore be used like the known dry blasting - sandblasting with dry sand - because discharge devices for water or the like are not required.
- the object of the invention is therefore to design and further develop the known method in such a way that, with the lowest consumption of liquid additive, the most uniform and uniform moistening of all the grains of the blasting agent in the entire jet is achieved.
- a precisely metered coating of each individual abrasive grain, regardless of its location in the air flow, is aimed for.
- the method according to the invention in which this object is achieved, is initially characterized in that the back pressure of the additional air flow in the injection region is approximately one and a half to two and a half times, preferably twice as high as the back pressure of the carrying air flow.
- the above-mentioned dynamic pressure difference between the additional air flow and the air flow ensures that the liquid additive penetrates deep enough into the air flow on the one hand, but on the other hand does not shoot through the air flow and is not only reflected on the inner wall of the blasting device used.
- a good atomization of the liquid additive is achieved in the specified parameter range; the desired low water consumption is achieved.
- the dust binding proves to be very cheap.
- the total pressure of a flowing medium is made up of the static pressure and the dynamic pressure.
- the back pressure is known to be the measure of the kinetic energy of the flowing medium, i.e. a direct measure of the flow velocity.
- sufficient mixing of the air flow and the additional air flow is achieved, which leads to the desired takeover of the liquid additive by the grains of the blasting medium.
- the focus has been on the dynamic pressures and thus indirectly on the speeds of the air flow and the additional air flow, but not on the actual speeds of the grains of the abrasive or the liquid additive.
- these speeds are always below the speed of the carrying air flow or additional air flow carrying them, so that the desired mixing results.
- the mass of abrasive supplied to the injection area in the time unit is approximately 1.4 to 2.5 times, in particular 1.7 to 2.2 times, the mass supplied to the injection area in the time unit Air corresponds to.
- the mass of additive, in particular water, supplied to the injection area in the time unit corresponds to approximately 2 o to 3 o, preferably d 6, of the mass of carrier air supplied to the injection area in the time unit.
- This mass of additive is sufficient, on the one hand, to be able to moisten the grains of the abrasive sufficiently in the entire cross-section of the air flow, but on the other hand it is not so high that excess, liquid additive is produced, which is either deposited in the blasting device or on the surface to be treated and must be dissipated.
- the consumption of liquid additive for example water, remains limited.
- the moistening of the grains of the blasting agent is improved by an additional relative movement between the grains of the blasting agent and the finely divided additive. This can be done by eccentrically introducing the air flow into the additional air flow; the grains of the blasting medium can be set in rotary movements, in particular in helical movements, or can also undergo their own rotation.
- a device as described in DE-A No. 2724318 is suitable for carrying out the method described above.
- the disclosure content of this document is expressly made the disclosure content of the present patent application.
- the grains of the blasting medium are still slow and therefore only move a short distance during the time required for moistening. This enables even moistening to be achieved.
- the suction effect in the smallest nozzle cross-section is not necessary anyway, because the additional air flow is fed with excess pressure.
- the dynamic pressure of the additional air flow is typically in the range from 10 to 30 bar. Satisfactory results were achieved with these pressure values.
- blasting media can only be introduced into a nozzle area if there is at the same time an additional air stream sufficiently loaded with additive.
- Even in the event of operating errors it is not possible to work without adding the liquid additive, in particular, therefore, to work with dry abrasive.
- the occupational safety achieved by wet blasting is always set and cannot be switched off due to operating errors.
- the forced coupling also ensures that the additional air flow is sufficiently loaded with the liquid additive in order to be able to adequately bind the accumulated dust quantities.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Nozzles (AREA)
- Sorption Type Refrigeration Machines (AREA)
- Jet Pumps And Other Pumps (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 ein mit einem flüssigen, die Körner des Strahlmittels benetzenden Zusatzstoff, insbesondere Wasser, beladener Zusatzluftstrom dem mit dem Strahlmittel beladenen Tragluftstrom zugegeben wird, insbesondere in den mit dem Strahlmittel beladenen Tragluftstrom injiziert wird. Ein solches Verfahren ist mit der DE-A Nr. 2724318 bekannt geworden.The invention relates to a method for compressed air blasting, in which a granular abrasive is introduced into a carrier air stream and conveyed by the carrier air stream, accelerated and blown against a surface to be treated, and a supplementary air stream loaded with a liquid additive wetting the grains of the blasting agent, in particular water is added with the air stream loaded with the blasting agent, in particular injected into the air stream loaded with the blasting agent. Such a method is known from DE-A No. 2724318.
Bei dem zuvor beschriebenen bekannten Verfahren zum Druckluftstrahlen wird ein sogenanntes Feuchtstrahlen angestrebt; die einzelnen Körner des Strahlmittels sollen mit dem Zusatzstoff so umhüllt werden, dass der beim Auftreffen auf die zu behandelnde Oberfläche aufgrund zerplatzender Körner des Strahlmittels sich entwickelnde Staub gebunden wird. Abgezielt wird somit bei dem bekannten Verfahren auf ein früher als Sandstrahlen und heute häufig als Freistrahlen bezeichnetes Verfahren, das aufgrund der Umhüllung der Körner des Strahlmittels mit dem Zusatzstoff weder ein Trockenstrahlen noch ein Nassstrahlen ist, sondern vielmehr im Zwischenbereich zwischen beiden Verfahren anzusiedeln ist.In the known method for compressed air blasting described above, so-called wet blasting is sought; the individual grains of the blasting medium should be coated with the additive in such a way that the dust which develops when it hits the surface to be treated due to bursting grains of the blasting medium is bound. The aim of the known process is thus a process formerly known as sandblasting and now often known as free blasting, which is neither dry blasting nor wet blasting due to the coating of the grains of the blasting medium with the additive, but rather is to be found in the intermediate area between the two processes.
Die Zugabe des Zusatzstoffes, insbesondere Wasser, erfolgt dabei so, dass einerseits die Umhüllung der einzelnen Körner des Strahlmittels nach dem Auftreffen praktisch schon verdunstet ist, so dass kein Zusatzstoff abläuft, dass andererseits aber die geringe Umhüllung der Körner des Strahlmittels ausreicht, um eine Staubbildung weitgehend zu unterdrücken, so dass zum Arbeitsschutz beigetragen wird, weil die Gefahr der typischen Berufskrankheit Staublunge deutlich verringert ist. Das bekannte Verfahren zeichnet sich durch einen geringen Wasserverbrauch aus und lässt sich somit wie das bekannte Trockenstrahlen - Sandstrahlen mit trockenem Sand - einsetzen, weil Abführeinrichtungen für anfallendes Wasser od. dgl. nicht erforderlich sind.The addition of the additive, in particular water, is carried out in such a way that, on the one hand, the coating of the individual grains of the blasting medium has practically evaporated after impact, so that no additive runs off, but on the other hand the low coating of the grains of the blasting medium is sufficient to prevent dust formation largely suppressed, so that contributes to occupational safety because the risk of the typical occupational disease dust lung is significantly reduced. The known method is characterized by a low water consumption and can therefore be used like the known dry blasting - sandblasting with dry sand - because discharge devices for water or the like are not required.
Bei der praktischen Durchführung des zuvor beschriebenen bekannten Verfahrens hat sich gezeigt, dass eine gleichmässige Anfeuchtung aller Körner des Strahlmittels im austretenden Strahl nicht immer mit Sicherheit vorliegt. Bei Versuchen haben sich häufig die im Mantelbereich des austretenden Strahls befindlichen Körner als ausreichend angefeuchtet, die innen im Strahl liegenden Körner jedoch als viel zu trocken gezeigt, so dass diese Körner beim Auftreffen auf die zu behandelnde Oberfläche unerwünscht viel Staub hervorriefen. Im übrigen hat sich bei anderen Versuchen gezeigt, dass sich der flüssige Zusatzstoff an den Innenwandungen des benutzten Strahlgeräts niederschlug, also nicht im erwünschten Umfang von den Körnern des Strahlmittels aufgenommen wurde.In the practical implementation of the known method described above, it has been shown that a uniform moistening of all the grains of the blasting medium in the emerging jet is not always certain. In experiments, the grains located in the jacket area of the emerging jet have often been moistened as sufficient, but the grains lying inside in the jet have been shown to be too dry, so that these grains undesirably caused a lot of dust when they hit the surface to be treated. Furthermore, it has been shown in other experiments that the liquid additive was deposited on the inner walls of the blasting device used, ie was not absorbed to the desired extent by the grains of the blasting agent.
Aufgabe der Erfindung ist daher, das bekannte Verfahren dahingehend auszugestalten und weiterzubilden, dass bei geringstem Verbrauch an flüssigem Zusatzstoff eine möglichst gleichartige und gleichmässige Anfeuchtung aller Körner des Strahlmittels im gesamten Strahl erreicht wird. Anders ausgedrückt wird eine genau dosierte Umhüllung jedes einzelnen Strahlmittelkorns, unabhängig von seinem Ort im Tragluftstrom, angestrebt.The object of the invention is therefore to design and further develop the known method in such a way that, with the lowest consumption of liquid additive, the most uniform and uniform moistening of all the grains of the blasting agent in the entire jet is achieved. In other words, a precisely metered coating of each individual abrasive grain, regardless of its location in the air flow, is aimed for.
Das erfindungsgemässe Verfahren, bei dem diese Aufgabe gelöst ist, ist zunächst dadurch gekennzeichnet, dass im Injektionsbereich der Staudruck des Zusatzluftstroms etwa eineinhalbmal bis zweieinhalbmal, vorzugsweise zweimal so hoch ist wie der Staudruck des Tragluftstroms. Der zuvor angegebene Staudruckunterschied zwischen dem Zusatzluftstrom und dem Traglufstrom gewährleistet, dass der flüssige Zusatzstoff einerseits tief genug in den Tragluftstrom eindringt, andererseits aber den Tragluftstrom nicht durchschiesst und sich nicht lediglich an der Innenwand des verwendeten Strahlgerätes niederschlägt. Im angegebenen Parameterbereich wird eine gute Zerstäubung des flüssigen Zusatzstoffes erzielt; es stellt sich der erwünschte geringe Wasserverbrauch ein. Dabei erweist sich die Staubbindung als sehr günstig.The method according to the invention, in which this object is achieved, is initially characterized in that the back pressure of the additional air flow in the injection region is approximately one and a half to two and a half times, preferably twice as high as the back pressure of the carrying air flow. The above-mentioned dynamic pressure difference between the additional air flow and the air flow ensures that the liquid additive penetrates deep enough into the air flow on the one hand, but on the other hand does not shoot through the air flow and is not only reflected on the inner wall of the blasting device used. A good atomization of the liquid additive is achieved in the specified parameter range; the desired low water consumption is achieved. The dust binding proves to be very cheap.
Nach der Bernoulli-Gleichung setzt sich der Gesamtdruck eines strömenden Mediums zusammen aus dem statischen Druck und dem Staudruck. Der Staudruck ist bekanntlich das Mass für die kinetische Energie des strömenden Mediums, also ein direktes Mass für die Strömungsgeschwindigkeit. Bei den angegebenen Staudruckverhältnissen wird eine ausreichende Durchmischung von Tragluftstrom und Zusatzluftstrom erreicht, die zur gewünschten Übernahme des flüssigen Zusatzstoffes durch die Körner des Strahlmittels führt.According to the Bernoulli equation, the total pressure of a flowing medium is made up of the static pressure and the dynamic pressure. The back pressure is known to be the measure of the kinetic energy of the flowing medium, i.e. a direct measure of the flow velocity. At the specified dynamic pressure ratios, sufficient mixing of the air flow and the additional air flow is achieved, which leads to the desired takeover of the liquid additive by the grains of the blasting medium.
Abgestellt wurde bislang auf die Staudrücke und somit indirekt auf die Geschwindigkeiten von Tragluftstrom und Zusatzluftstrom, nicht aber auf die tatsächlichen Geschwindigkeiten der Körner des Strahlmittels bzw. des flüssigen Zusatzstoffes. Diese Geschwindigkeiten liegen jedoch stets unterhalb der Geschwindigkeit des sie tragenden Tragluftstroms bzw. Zusatzluftstroms, so dass sich die gewünschte Durchmischung ergibt. Dabei ist es jedoch besonders vorteilhaft, wenn die in der Zeiteinheit dem Injektionsbereich zugeführte Masse an Strahlmittel etwa dem 1,4- bis 2,5-, insbesondere dem 1,7- bis 2,2fachen, der in der Zeiteinheit dem Injektionsbereich zugeführten Masse an Tragluft entspricht. Bei diesen Massenverhältnissen wird unter Berücksichtigung der angegebenen Staudruckverhältnisse eine optimale Durchmischung beider Luftströme erreicht; weder quetscht ein Luftstrom den anderen ab, noch ist die im Zusatzluftstrom zugeführte Luftmenge so gross, dass sie die Beladung des austretenden Strahls an Strahlmittel und damit die Fähigkeit dieses Strahls, eine Oberfläche effektiv zu behandeln, entscheidend verringert. Weiterhin wird die in . Flugrichtung der Körner des Strahlmittels gemessene Länge des Injektionsbereiches in vernünftigen Grenzen gehalten, falls der Winkel zwischen dem Tragluftstrom und dem Zusatzluftstrom nicht zu klein gewählt wird. Relativ kurze Injektionsbereiche haben den Vorteil, dass die verwendeten Strahlgeräte nicht zu lang werden.So far, the focus has been on the dynamic pressures and thus indirectly on the speeds of the air flow and the additional air flow, but not on the actual speeds of the grains of the abrasive or the liquid additive. However, these speeds are always below the speed of the carrying air flow or additional air flow carrying them, so that the desired mixing results. In this case, however, it is particularly advantageous if the mass of abrasive supplied to the injection area in the time unit is approximately 1.4 to 2.5 times, in particular 1.7 to 2.2 times, the mass supplied to the injection area in the time unit Air corresponds to. With these mass ratios, optimal mixing of both air streams is achieved, taking into account the specified dynamic pressure ratios; neither does one air flow squeeze the other out, nor is the amount of air supplied in the additional air flow so large that it significantly reduces the loading of the emerging jet of abrasive and thus the ability of this jet to effectively treat a surface. Furthermore, the in. Direction of flight of the grains of the blasting medium measured length of the injection area kept within reasonable limits, if the angle between the carrier air flow and the additional air flow is not chosen too small. Relatively short injection area rich have the advantage that the blasting equipment used does not become too long.
Unter den zuvor angegebenen Bedingungen hat es sich als optimal herausgestellt, wenn die in der Zeiteinheit dem Injektionsbereich zugeführte Masse an Zusatzstoff, also insbesondere Wasser, etwa 2o bis 3o vorzugsweise d6 der in der Zeiteinheit dem Injektionsbereich zugeführten Masse an Tragluft entspricht. Diese Masse an Zusatzstoff reicht einerseits aus, um im gesamten Querschnitt des Tragluftstroms die Körner des Strahlmittels ausreichend anfeuchten zu können, ist andererseits aber nicht so hoch, dass überschüssiger, flüssiger Zusatzstoff anfällt, der sich entweder im Strahlgerät oder auf der zu behandelnden Oberfläche niederschlägt und abgeführt werden muss. Somit bleibt der Verbrauch an flüssigem Zusatzstoff, z.B. an Wasser, wie angestrebt, begrenzt.Under the conditions specified above, it has been found to be optimal if the mass of additive, in particular water, supplied to the injection area in the time unit corresponds to approximately 2 o to 3 o, preferably d 6, of the mass of carrier air supplied to the injection area in the time unit. This mass of additive is sufficient, on the one hand, to be able to moisten the grains of the abrasive sufficiently in the entire cross-section of the air flow, but on the other hand it is not so high that excess, liquid additive is produced, which is either deposited in the blasting device or on the surface to be treated and must be dissipated. As a result, the consumption of liquid additive, for example water, remains limited.
Um die Körner des Strahlmittels in der gewünschten Weise, also möglichst dünn und ringsum auf ihrer gesamten Oberfläche anfeuchten zu können, empfiehlt es sich, je nach dem Werkstoff des Strahlmittels, die einzelnen Körner vor der Zugabe des flüssigen Zusatzstoffes mit einem Benetzungsmittel, insbesondere einem hydrophilen Material, zu überziehen. Weiterhin wird die Anfeuchtung der Körner des Strahlmittels durch eine zusätzliche Relativbewegung zwischen den Körnern des Strahlmittels und dem feinverteilten Zusatzstoff verbessert. Dies kann durch aussermittiges Einleiten des Tragluftstroms in den Zusatzluftstrom erfolgen; die Körner des Strahlmittels können in Drehbewegungen, insbesondere in schraubenlinienförmig verlaufende Bewegungen versetzt werden oder auch eine Eigendrehung erhalten. Durch diese Relativbewegungen wird erreicht, dass die gesamte Oberfläche jedes einzelnen Korns des Strahlmittels erreicht wird, obwohl die Zusammenführung von Tragluftstrom und Zusatzluftstrom zwangsläufig in einem gewissen Winkel, zumindest einem Winkelbereich erfolgt und aufgrund dieser Zusammenführung lediglich eine teilweise Benetzung der einzelnen Körner zu erwarten ist.In order to be able to moisten the grains of the blasting medium in the desired way, i.e. as thinly as possible and all around on its entire surface, it is advisable, depending on the material of the blasting medium, to add a wetting agent, especially a hydrophilic one, to the individual grains before adding the liquid additive Material to coat. Furthermore, the moistening of the grains of the blasting agent is improved by an additional relative movement between the grains of the blasting agent and the finely divided additive. This can be done by eccentrically introducing the air flow into the additional air flow; the grains of the blasting medium can be set in rotary movements, in particular in helical movements, or can also undergo their own rotation. Through these relative movements it is achieved that the entire surface of each individual grain of the abrasive is reached, although the combination of the carrier air flow and the additional air flow necessarily takes place at a certain angle, at least one angular range, and due to this combination only partial wetting of the individual grains is to be expected.
Zur Durchführung des oben beschriebenen Verfahrens eignet sich eine Vorrichtung, wie sie in der DE-A Nr. 2724318 beschrieben ist. Der Offenbarungsgehalt dieser Druckschrift wird ausdrücklich zum Offenbarungsgehalt der hier vorliegenden Patentanmeldung gemacht. In Abänderung des bekannten Strahlgeräts wird jedoch zusätzlich vorgeschlagen, die Injektionskanäle für den mit dem flüssigen Zusatzstoff beladenen Zusatzluftstrom nicht im Bereich der Engstelle der VenturiDüse münden zulassen, sondern vielmehr - in Flugrichtung der Körner des Strahlmittels gesehen -vor dieser Engstelle anzuordnen. Vor dem engsten Düsenquerschnitt haben die Körner des Strahlmittels noch eine geringe Geschwindigkeit und bewegen sich deshalb während der für das Anfeuchten benötigten Zeit nur auf einer kurzen Strecke. Dadurch kann eine gleichmässige Anfeuchtung erreicht werden. Die Ansaugwirkung im geringsten Düsenquerschnitt ist ohnehin nicht notwendig, weil der Zusatzluftstrom mit Überdruck eingespeist wird.A device as described in DE-A No. 2724318 is suitable for carrying out the method described above. The disclosure content of this document is expressly made the disclosure content of the present patent application. In a modification of the known blasting device, however, it is additionally proposed not to allow the injection channels for the additional air stream loaded with the liquid additive to open out in the area of the constriction of the Venturi nozzle, but rather - in the direction of flight of the grains of the blasting agent - to be arranged in front of this constriction. Before the narrowest cross-section of the nozzle, the grains of the blasting medium are still slow and therefore only move a short distance during the time required for moistening. This enables even moistening to be achieved. The suction effect in the smallest nozzle cross-section is not necessary anyway, because the additional air flow is fed with excess pressure.
Der Staudruck des Zusatzluftstroms liegt typischerweise im Bereich von 10 bis 30 bar. Mit diesen Straudruckwerten wurden zufriedenstellende Ergebnisse erzielt. Schliesslich ist es bei dem erfindungsgemässen Verfahren noch vorteilhaft, die Zugabe von Strahlmittel mit der Zugabe des mit dem Zusatzstoff beladenen Zusatzluftstroms zwangszukoppeln. Dadurch kann nur dann Strahlmittel in einen Düsenbereich eingeleitet werden, wenn zugleich ein ausreichend mit Zusatzstoff beladener Zusatzluftstrom vorhanden ist. Auch bei Bedienungsfehlern ist es nicht möglich, ohne Zugabe des flüssigen Zusatzstoffs zu arbeiten, insbesondere also mit trockenem Strahlmittel zu arbeiten. Der durch das Feuchtstrahlen erzielte Arbeitsschutz stellt sich also stets ein und ist auch durch Bedienungsfehler nicht auszuschalten. Dabei sorgt die Zwangskopplung zudem für eine ausreichende Beladung des Zusatzluftstroms mit dem flüssigen Zusatzstoff, um die anfallenden Staubmengen stets ausreichend binden zu können.The dynamic pressure of the additional air flow is typically in the range from 10 to 30 bar. Satisfactory results were achieved with these pressure values. Finally, in the method according to the invention, it is also advantageous to forcibly couple the addition of blasting agent with the addition of the additional air stream loaded with the additive. As a result, blasting media can only be introduced into a nozzle area if there is at the same time an additional air stream sufficiently loaded with additive. Even in the event of operating errors, it is not possible to work without adding the liquid additive, in particular, therefore, to work with dry abrasive. The occupational safety achieved by wet blasting is always set and cannot be switched off due to operating errors. The forced coupling also ensures that the additional air flow is sufficiently loaded with the liquid additive in order to be able to adequately bind the accumulated dust quantities.
Claims (9)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT82105335T ATE12196T1 (en) | 1981-07-09 | 1982-06-18 | PROCESS FOR COMPRESSED AIR BLASTING. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19813127035 DE3127035A1 (en) | 1981-07-09 | 1981-07-09 | "PROCESS FOR AIR RADIATION" |
| DE3127035 | 1981-07-09 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0069874A2 EP0069874A2 (en) | 1983-01-19 |
| EP0069874A3 EP0069874A3 (en) | 1983-04-13 |
| EP0069874B1 true EP0069874B1 (en) | 1985-03-20 |
Family
ID=6136450
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP82105335A Expired EP0069874B1 (en) | 1981-07-09 | 1982-06-18 | Abrasive blasting method using air under pressure |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US4802312A (en) |
| EP (1) | EP0069874B1 (en) |
| JP (1) | JPS5871065A (en) |
| KR (1) | KR840000284A (en) |
| AT (1) | ATE12196T1 (en) |
| DE (2) | DE3127035A1 (en) |
| GR (1) | GR76183B (en) |
| PT (1) | PT75183B (en) |
Families Citing this family (26)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3413576A1 (en) * | 1984-04-11 | 1985-10-24 | Druckluft- und Vakuumtechnik Ing. Heinz Kieß GmbH & Co KG, 4330 Mülheim | METHOD AND DEVICE FOR BLASTING WORKPIECES, CONSTRUCTIONS AND THE LIKE BY means of a carrier air stream loaded with a granular blasting agent |
| DE3415174A1 (en) * | 1984-04-21 | 1985-10-31 | Ernst Peiniger GmbH Unternehmen für Bautenschutz, 4300 Essen | Process for abrasive blasting using compressed air |
| EP0171448B1 (en) * | 1984-08-14 | 1988-02-03 | Johann Szücs | Device and method for cleaning of stone and metal surfaces |
| DE3730320A1 (en) * | 1987-09-10 | 1989-03-30 | Bayer Ag | USE OF WAITER DISPERSIONS FOR THE PRESSURE AIR RADIATION |
| AU622841B2 (en) * | 1988-03-02 | 1992-04-16 | Cleaning Technology Limited | Abrasive cleaning or cutting |
| WO1992010335A1 (en) * | 1990-12-07 | 1992-06-25 | Kievsky Institut Grazhdanskoi Aviatsii Imeni 60-Letia Sssr | Method for hydroabrasive cleaning of surface of articles |
| US5203698A (en) * | 1991-04-25 | 1993-04-20 | Blake Thomas S | Wet foam sandblaster |
| US5160548A (en) * | 1991-09-09 | 1992-11-03 | Ohmstede Mechanical Services, Inc. | Method for cleaning tube bundles using a slurry |
| US5332447A (en) * | 1993-01-21 | 1994-07-26 | Church & Dwight Co., Inc. | Method of cleaning using a blast media containing a surfactant-clathrate compound |
| US5308403A (en) * | 1993-01-21 | 1994-05-03 | Church & Dwight Co., Inc. | Blast media containing magnesium oxide |
| US5316587A (en) * | 1993-01-21 | 1994-05-31 | Church & Dwight Co., Inc. | Water soluble blast media containing surfactant |
| US5407378A (en) * | 1993-07-23 | 1995-04-18 | Church & Dwight Co., Inc. | Water blasting process |
| US5384990A (en) * | 1993-08-12 | 1995-01-31 | Church & Dwight Co., Inc. | Water blasting process |
| US5593339A (en) * | 1993-08-12 | 1997-01-14 | Church & Dwight Co., Inc. | Slurry cleaning process |
| US5637029A (en) * | 1993-11-22 | 1997-06-10 | Lehane; William B. | Method and apparatus for shot blasting materials |
| US8353741B2 (en) * | 2009-09-02 | 2013-01-15 | All Coatings Elimination System Corporation | System and method for removing a coating from a substrate |
| EP2397257B1 (en) | 2010-06-21 | 2018-01-03 | Omax Corporation | Systems for abrasive jet piercing and associated methods |
| US9283656B2 (en) | 2011-04-01 | 2016-03-15 | Omax Corporation | Systems and methods for fluidizing an abrasive material |
| US9586306B2 (en) | 2012-08-13 | 2017-03-07 | Omax Corporation | Method and apparatus for monitoring particle laden pneumatic abrasive flow in an abrasive fluid jet cutting system |
| US8904912B2 (en) | 2012-08-16 | 2014-12-09 | Omax Corporation | Control valves for waterjet systems and related devices, systems, and methods |
| US11577366B2 (en) | 2016-12-12 | 2023-02-14 | Omax Corporation | Recirculation of wet abrasive material in abrasive waterjet systems and related technology |
| US11554461B1 (en) | 2018-02-13 | 2023-01-17 | Omax Corporation | Articulating apparatus of a waterjet system and related technology |
| US11224987B1 (en) | 2018-03-09 | 2022-01-18 | Omax Corporation | Abrasive-collecting container of a waterjet system and related technology |
| WO2021127253A1 (en) | 2019-12-18 | 2021-06-24 | Hypertherm, Inc. | Liquid jet cutting head sensor systems and methods |
| CN115698559A (en) | 2020-03-24 | 2023-02-03 | 海别得公司 | High pressure seal for liquid jet cutting system |
| CN115698507A (en) | 2020-03-30 | 2023-02-03 | 海别得公司 | Cylinder for liquid injection pump with multifunctional interface longitudinal end |
Family Cites Families (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE192600C (en) * | ||||
| BE486822A (en) * | ||||
| US738218A (en) * | 1903-06-05 | 1903-09-08 | Harry J Mackintosh | Woven fabric. |
| US1848122A (en) * | 1930-02-20 | 1932-03-08 | Alois W Forster | Device for use in introducing alpha fluid into alpha conduit for flowing materials |
| US2114573A (en) * | 1936-04-04 | 1938-04-19 | George F Rhodes | Sand blasting process |
| US2380738A (en) * | 1940-07-29 | 1945-07-31 | Arthur H Eppler | Art of sandblasting |
| US2369576A (en) * | 1943-12-20 | 1945-02-13 | Pangborn Corp | Blast gun |
| US2508766A (en) * | 1946-01-07 | 1950-05-23 | Morel Stanislas | Device for increasing the efficiency of sandblast gun operating by means of compressed air |
| US2543517A (en) * | 1947-06-09 | 1951-02-27 | Jo Zach Miller Iii | Apparatus for combining and emplacing cementitious substances |
| US2587184A (en) * | 1949-05-09 | 1952-02-26 | Alvin L Marjama | Sandblast nozzle |
| FR1060192A (en) * | 1952-07-08 | 1954-03-31 | Hydraulic sandblasting process | |
| FR1097024A (en) * | 1954-03-01 | 1955-06-28 | Mixing nozzle for sandblasting and fluid sprayer | |
| US3344558A (en) * | 1965-07-23 | 1967-10-03 | Wyatt S Kirkland | Sand blast nozzle |
| NL6815103A (en) * | 1968-10-23 | 1970-04-27 | ||
| US4080762A (en) * | 1976-08-26 | 1978-03-28 | Watson John D | Fluid-abrasive nozzle device |
| GB1571508A (en) * | 1977-02-17 | 1980-07-16 | Kelsall T | Wet blast cleaning |
| DE2724318C2 (en) * | 1977-05-28 | 1984-09-20 | Ernst Peiniger GmbH Unternehmen für Bautenschutz, 4300 Essen | Process for moistening the abrasive when blasting with compressed air |
| DE2911629A1 (en) * | 1979-03-24 | 1980-09-25 | Peiniger Ernst Gmbh | Pressure air appts. with blast nozzle - has central orifice for blast material, surrounded by air nozzles whose axes cross orifice axis at specified distance |
| US4253610A (en) * | 1979-09-10 | 1981-03-03 | Larkin Joe M | Abrasive blast nozzle |
-
1981
- 1981-07-09 DE DE19813127035 patent/DE3127035A1/en not_active Withdrawn
-
1982
- 1982-06-18 DE DE8282105335T patent/DE3262640D1/en not_active Expired
- 1982-06-18 EP EP82105335A patent/EP0069874B1/en not_active Expired
- 1982-06-18 AT AT82105335T patent/ATE12196T1/en active
- 1982-06-23 GR GR68524A patent/GR76183B/el unknown
- 1982-06-30 KR KR1019820002930A patent/KR840000284A/en not_active Withdrawn
- 1982-07-05 PT PT75183A patent/PT75183B/en not_active IP Right Cessation
- 1982-07-06 US US06/395,619 patent/US4802312A/en not_active Expired - Fee Related
- 1982-07-07 JP JP57117046A patent/JPS5871065A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| EP0069874A3 (en) | 1983-04-13 |
| US4802312A (en) | 1989-02-07 |
| PT75183A (en) | 1982-08-01 |
| KR840000284A (en) | 1984-02-18 |
| DE3127035A1 (en) | 1983-01-27 |
| GR76183B (en) | 1984-08-03 |
| ATE12196T1 (en) | 1985-04-15 |
| JPS5871065A (en) | 1983-04-27 |
| PT75183B (en) | 1984-05-28 |
| DE3262640D1 (en) | 1985-04-25 |
| EP0069874A2 (en) | 1983-01-19 |
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