EP0069875B1 - Verfahren zum Druckluftstrahlen und Strahlgerät zur Durchführung des Verfahrens - Google Patents

Verfahren zum Druckluftstrahlen und Strahlgerät zur Durchführung des Verfahrens Download PDF

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Publication number
EP0069875B1
EP0069875B1 EP82105336A EP82105336A EP0069875B1 EP 0069875 B1 EP0069875 B1 EP 0069875B1 EP 82105336 A EP82105336 A EP 82105336A EP 82105336 A EP82105336 A EP 82105336A EP 0069875 B1 EP0069875 B1 EP 0069875B1
Authority
EP
European Patent Office
Prior art keywords
gas stream
additive
carrier gas
blasting
particulate
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
Application number
EP82105336A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0069875A3 (en
EP0069875A2 (de
Inventor
Karl Christian Glaeser
Gerhard Buhr
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ernst Peiniger Unternehmen fur Bautenschutz GmbH
Ernst Peiniger GmbH Unternehmen fur Bautenschutz
Original Assignee
Ernst Peiniger Unternehmen fur Bautenschutz GmbH
Ernst Peiniger GmbH Unternehmen fur Bautenschutz
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Ernst Peiniger Unternehmen fur Bautenschutz GmbH, Ernst Peiniger GmbH Unternehmen fur Bautenschutz filed Critical Ernst Peiniger Unternehmen fur Bautenschutz GmbH
Priority to AT82105336T priority Critical patent/ATE10595T1/de
Publication of EP0069875A2 publication Critical patent/EP0069875A2/de
Publication of EP0069875A3 publication Critical patent/EP0069875A3/de
Application granted granted Critical
Publication of EP0069875B1 publication Critical patent/EP0069875B1/de
Expired legal-status Critical Current

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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 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 an auxiliary air stream laden with an additive, in particular water, is added to the laden carrier air stream, and one Abrasive feed line is a downstream converging area.
  • the blasting medium is moistened by adding the additional air stream laden with a liquid additive (cf. DE-OS No. 2724318).
  • a liquid additive cf. DE-OS No. 2724318.
  • 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, that is to say 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 highest possible impact speed of the blasting medium on the surface to be treated is aimed for.
  • the blasting medium transported in a supply line by means of flight conveyance through the air flow is entrained in the nozzle area of the blasting device, in which the static pressure of the air flow is converted as much as possible into kinetic energy, by the air flow accelerated in this way, whereby the blasting medium should reach a speed that is as high as possible Range of the speed of the air flow is.
  • 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 in a relatively long way, in which the nozzle area has a relatively long constriction area.
  • the speed of the blasting agent remains significantly behind the speed of the air flow.
  • the speed of the blasting agent is further reduced by the fact that the blasting agent experiences a mass increase due to the liquid additive with which it is moistened, so that its actual acceleration is reduced even further.
  • a disadvantage of the known, previously described method 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 region of the blasting device in which a high acceleration of the blasting agent is to be achieved at the same time.
  • the time available for wetting the blasting agent with the additive is 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 in such a way that, on the one hand, a targeted, easily controllable and complete coating of the blasting medium with the preferably liquid additive is possible with the smallest amount of this additive, on the other hand but the acceleration of the abrasive 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 air flow, which is in the converging area, in which the blasting agent feed line is arranged, in which the Speed and the acceleration of the abrasive 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 areas 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 Conditions with regard to the trajectory of the blasting agent, so that the moistening of the blasting agent can take place at this point 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 agent.
  • 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 an off-center addition of the additional air stream.
  • 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 for the addition of the additional air flow loaded with the additive is formed at the beginning of the constriction area of the nozzle area.
  • the addition of the additional air stream loaded with the additive is preferably carried out via a slot which forms an angle of 45 ° with the axis of the nozzle region and is at a distance of a quarter of the total length of the constriction region from the entry end of the constriction region.
  • a granular abrasive 2 is fed to the blasting device through a feed line 1 by means of flight promotion, in a stream of carrier air, 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 consists essentially 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 carrying air stream loaded with the blasting agent 2 via a slot 8, which is loaded with a liquid additive, in particular water.
  • the loaded additional air stream is fed via a connecting piece 9 and a (not shown) feed line under pressure into an annular chamber 10, from where it is injected at an angle of approximately 45 ° to the direction of flight of the blasting agent through the slot 8 into the carrying air stream loaded with the blasting agent 2 becomes.
  • the dynamic pressure of the additional air flow is approximately twice as high as the dynamic pressure of the carrying air flow, so that the additional air flow can completely penetrate the carrying air flow. This ensures that the blasting agent 2 can be wetted with the liquid additive in a uniform and metered manner.
  • 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)
  • Mechanical Treatment Of Semiconductor (AREA)
  • Treatments Of Macromolecular Shaped Articles (AREA)
  • Air Transport Of Granular Materials (AREA)
  • Glanulating (AREA)
  • Processing Of Solid Wastes (AREA)
EP82105336A 1981-07-09 1982-06-18 Verfahren zum Druckluftstrahlen und Strahlgerät zur Durchführung des Verfahrens Expired EP0069875B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82105336T ATE10595T1 (de) 1981-07-09 1982-06-18 Verfahren zum druckluftstrahlen und strahlgeraet zur durchfuehrung des verfahrens.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3127013 1981-07-09
DE19813127013 DE3127013A1 (de) 1981-07-09 1981-07-09 Verfahren zum druckluftstrahlen und strahlgeraet zur durchfuehrung des verfahrens

Publications (3)

Publication Number Publication Date
EP0069875A2 EP0069875A2 (de) 1983-01-19
EP0069875A3 EP0069875A3 (en) 1983-04-06
EP0069875B1 true EP0069875B1 (de) 1984-12-05

Family

ID=6136440

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82105336A Expired EP0069875B1 (de) 1981-07-09 1982-06-18 Verfahren zum Druckluftstrahlen und Strahlgerät zur Durchführung des Verfahrens

Country Status (7)

Country Link
EP (1) EP0069875B1 (el)
JP (1) JPS6029540B2 (el)
KR (1) KR840000282A (el)
AT (1) ATE10595T1 (el)
DE (2) DE3127013A1 (el)
GR (1) GR76182B (el)
PT (1) PT75184B (el)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4648215A (en) * 1982-10-22 1987-03-10 Flow Industries, Inc. Method and apparatus for forming a high velocity liquid abrasive jet
CA1231235A (en) * 1982-10-22 1988-01-12 Mohammed Hashish Method and apparatus for forming a high velocity liquid abrasive jet
DE3415174A1 (de) * 1984-04-21 1985-10-31 Ernst Peiniger GmbH Unternehmen für Bautenschutz, 4300 Essen Verfahren zum druckluftstrahlen
DE3469145D1 (en) * 1984-08-14 1988-03-10 Johan Szucs Stone and metal cleaning system
JPS6243655U (el) * 1985-09-02 1987-03-16

Family Cites Families (6)

* Cited by examiner, † Cited by third party
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 (fr) * 1952-07-23 1954-10-31 Rosset Paul Procédé de sablage et pistolet pour la mise en oeuvre de ce procédé.
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

Also Published As

Publication number Publication date
ATE10595T1 (de) 1984-12-15
PT75184A (de) 1982-08-01
EP0069875A3 (en) 1983-04-06
KR840000282A (ko) 1984-02-18
EP0069875A2 (de) 1983-01-19
JPS6029540B2 (ja) 1985-07-11
JPS5861855A (ja) 1983-04-13
DE3127013A1 (de) 1983-01-27
PT75184B (de) 1984-05-28
GR76182B (el) 1984-08-03
DE3261457D1 (en) 1985-01-17

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