EP0554692A1 - Verfahren zum Sandstrahlen und Vorrichtung zur Durchführung des Verfahrens - Google Patents

Verfahren zum Sandstrahlen und Vorrichtung zur Durchführung des Verfahrens Download PDF

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Publication number
EP0554692A1
EP0554692A1 EP93100607A EP93100607A EP0554692A1 EP 0554692 A1 EP0554692 A1 EP 0554692A1 EP 93100607 A EP93100607 A EP 93100607A EP 93100607 A EP93100607 A EP 93100607A EP 0554692 A1 EP0554692 A1 EP 0554692A1
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EP
European Patent Office
Prior art keywords
water
bar
air
pressure
blasting
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.)
Withdrawn
Application number
EP93100607A
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German (de)
English (en)
French (fr)
Inventor
Rainer Ing. Angst
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.)
BETON- UND MONIERBAU GMBH
Original Assignee
BETON- und MONIERBAU GmbH
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 BETON- und MONIERBAU GmbH filed Critical BETON- und MONIERBAU GmbH
Publication of EP0554692A1 publication Critical patent/EP0554692A1/de
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • B24C7/0076—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 the blasting medium being a liquid stream
    • 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

Definitions

  • the invention relates to a method for sandblasting surfaces, objects or the like to be renovated, wherein a pressurized air / abrasive mixture is fed in front of a blasting nozzle of a sandblasting device, the pressure of which is greater than the pressure of the air / abrasive mixture.
  • Wet, wet and fog blasting is a sandblasting technique in which larger amounts of water are added to the blasting media to avoid the development of dust.
  • the sandblasting processes mentioned have various disadvantages.
  • the wet blasting devices In the wet blasting process, the power is generated not with air but with water. As a result, the wet blasting devices have only a limited capacity, which depends on the pump output. The devices work on the principle of injection. The water consumption is usually up to 50 l per minute, so that no dust development occurs with this process. However, the treated surface becomes very clogged with this method and the water is heavily contaminated, so that retention basins are required to recycle the amounts of water, which has a very disadvantageous cost.
  • Air is used as the driving medium for wet blasting.
  • an annular nozzle is placed over the jet nozzle, from which a water curtain surrounds the dust jet like an envelope in a funnel shape.
  • the disadvantage of this method of operation is that a clean surface is only created in the core. With a cleaned area of approx. 1 m2, at least 4 m2 are covered with mud and dirty.
  • This pollution consists of blasting media, blasted material and the water that is used to bind dust. So you have a good blasting performance with largely dust-free, but there are considerable disposal problems, since after processing about 10 t of blasting media about 20 t have to be disposed of.
  • the invention takes a different approach.
  • the disadvantages of the known methods namely silting up of the treated surfaces, high water consumption and pollution of the water and dust formation are essentially avoided.
  • the invention achieves this in that the water is supplied in the form of at least one grid or at least one wall at such a high pressure that the grid or the wall remains stable when the air / blasting agent mixture passes.
  • the blasting agent passing through the grating or the wall is wetted on the one hand with water and thus carries a weak water film.
  • the abrasive hits the surface to be treated or the object, the water is immediately at the point of impact, i.e. at the point of origin of the dust. In this way, dust binding is severely restricted as it arises. Since the blasting agent is only wetted with the water, thus a large water surface is generated with low water consumption, the surface to be treated is not silted up.
  • the difference to the fog blasting method lies essentially in the fact that in the wetting method according to the invention the blasting agent is essentially completely wetted and the dust is thus already bound at its point of origin. With the fog process, only a fog is generated, which is to prevent the spreading dust.
  • part of the water supplied in the jet nozzle is accelerated to such a speed that the water in the jet nozzle is broken up into the finest particles up to molecular size. Together with the feature of claim 1 according to the invention, this results in a strong cracking of the water, so that a very large water surface is created which enables a high level of dust binding.
  • a stable wall or a stable grid can be achieved if the water is applied at a pressure of at least 30 bar and the air / blasting agent mixture is applied at least 4 bar.
  • higher pressures are generally necessary, it makes sense to apply the water at a pressure of 70 to 110 bar and the air / blasting agent mixture at 6 to 16 bar.
  • the air / abrasive mixture is operated at a high efficiency and with an excellent dust binding with a water pressure of 90 bar and a pressure of 8 bar. If a heavier blasting agent is used, the water pressure can also be 100 bar, while the mixture is applied at about 10 bar. A further increase in the water pressure to 110 bar and the pressure of the mixture to 12 bar is also possible and brings good results.
  • a slurry is not to be discharged (shotcrete), but the intention is to finely wet the individual grains of the blasting agent and to use these wetted grains for sandblasting.
  • a caking of the wetted abrasive grains is neither intended nor desirable.
  • the method according to the invention is an abrasive method, whereas in the known shotcrete method nothing is removed, on the contrary a material, namely shotcrete, is applied or applied.
  • the invention further relates to an apparatus for performing the method.
  • the device known for mist blasting has a water feed device, a blasting agent feed device and a nozzle holder for a blasting nozzle, which connects to the blasting agent feed device as seen in the conveying direction.
  • the water supply device is connected to the nozzle holder for supplying pressurized water into the air / abrasive mixture.
  • a device with at least one slot to form a wall and / or a number of at least two bores in a row to form a grid is provided in the nozzle holder.
  • a wall or a grid can be produced in a simple manner through the slot or the bores. Such a device is simple and inexpensive to manufacture.
  • the bore diameter or the slot width should be ⁇ 1 mm in order to produce a thin, fine-meshed grid or wall. Good results are achieved if the slot width or the bore diameter is 0.2 to 0.9 mm, very good values being achieved with a slot width of about 0.3 mm and a bore diameter of about 0.5 mm.
  • the device is designed as a tube inserted into the nozzle holder.
  • a tube with corresponding bores and / or slots is easy to manufacture and at low cost, and can also be inserted into the nozzle holder in a simple manner.
  • the single figure shows a view of the device according to the invention in a partially sectioned representation.
  • the sandblasting wetting device according to the invention has an abrasive supply device, generally designated 2.
  • the blasting agent feed device 2 includes, among other things, a compressor (not shown) and a blasting vessel (also not shown) with the blasting agent. Connected to these devices is a material hose 3 which is fastened at its end to a nozzle holder 5 via a screw connection 4.
  • the device 1 also has a water supply device, generally designated 6, which is provided with a high-pressure pump (not shown).
  • the high-pressure pump is connected to a high-pressure hose 7, which is connected at its end to a connection 8.
  • a valve 9 In port 8 there is a valve 9 to control the water flow.
  • the water supply device 6 merges into the nozzle holder 5 via a connecting part 10.
  • the nozzle holder 5 has a circumferential annular space 11.
  • nozzle holder 5 In the nozzle holder 5 there is part of a tube 12 which bears with a flange 13 on a shoulder 14 of the nozzle holder 5.
  • the tube adjoins the material hose 3 at its rear end (viewed in the direction of conveyance F) and is flush with it.
  • the said annular space 11 is formed between the nozzle holder 5 and the tube 12.
  • the bores of the individual rows are clearly offset from one another.
  • the bore diameter is always less than 1.5 mm. Depending on the blasting agent and the object to be blasted or the surface to be blasted, it can be up to 0.2 mm, all diameters between 0.2 and 1.5 mm at intervals of one tenth of a millimeter are conceivable.
  • slots can also be provided, which is not shown.
  • several slots can also be provided in a row. While the holes are used to create a close-meshed grid, the slots are used to create a wall. What has been said about the hole diameters applies to the slot width.
  • a jet nozzle 19 connects to the front end of the tube 12 and is connected to the tube 12 via a holder 20.
  • the holder 20 has an internal thread 21
  • the jet nozzle has an external thread 22.
  • the acceleration region 23 and the discharge region 24 are provided in the jet nozzle, which is provided on the inside with a hardened material.
  • water is supplied to the nozzle holder 5 at a pressure of at least 30 bar via the hose 7.
  • a close-meshed grid or three walls is formed.
  • the air jet mixture is passed through the grid or the walls at a pressure of at least 4 bar. While on the one hand the individual abrasive particles are wetted as they pass through the grating, on the other hand water in the form of very fine particles is torn out of the grating or the walls.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Nozzles (AREA)
EP93100607A 1992-01-24 1993-01-16 Verfahren zum Sandstrahlen und Vorrichtung zur Durchführung des Verfahrens Withdrawn EP0554692A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19924201860 DE4201860C1 (enrdf_load_stackoverflow) 1992-01-24 1992-01-24
DE4201860 1992-01-24

Publications (1)

Publication Number Publication Date
EP0554692A1 true EP0554692A1 (de) 1993-08-11

Family

ID=6450149

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93100607A Withdrawn EP0554692A1 (de) 1992-01-24 1993-01-16 Verfahren zum Sandstrahlen und Vorrichtung zur Durchführung des Verfahrens

Country Status (2)

Country Link
EP (1) EP0554692A1 (enrdf_load_stackoverflow)
DE (1) DE4201860C1 (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2753643A1 (fr) * 1996-09-24 1998-03-27 Loubeyre Patrick Dispositif de commande d'une installation de nettoyage de surfaces contaminees
PL428812A1 (pl) * 2019-02-04 2019-10-21 Land Reko Spółka Z Ograniczoną Odpowiedzialnością Spółka Komandytowa Zawór ścierniwa, zwłaszcza piaskarki

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4440146C2 (de) * 1994-11-10 1999-07-22 Kaercher Gmbh & Co Alfred Strahlvorrichtung zur Reinigung von Gegenständen
GR1003488B (el) * 1999-09-23 2000-11-30 Υδροαμμοβολη ελευθερης σκονης
DE10311137B4 (de) * 2003-03-12 2008-07-10 Elma Hans Schmidbauer Gmbh & Co Kg Strahlgerät

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2376616A (en) * 1944-01-18 1945-05-22 Metalweld Inc Sandblasting apparatus
DE2724318A1 (de) * 1977-05-28 1978-11-30 Peiniger Ernst Gmbh Verfahren und anlage zum druckluftstrahlen
AU553658B2 (en) * 1983-04-27 1986-07-24 Bolrette Pty. Ltd. Abrasive blasting apparatus
US4817342A (en) * 1987-07-15 1989-04-04 Whitemetal Inc. Water/abrasive propulsion chamber
DE9000178U1 (de) * 1990-01-09 1990-03-15 BeHaS Sandstrahlsysteme GmbH, 5100 Aachen Düsenvorrichtung für Sandstrahlgeräte
US4922664A (en) * 1987-05-06 1990-05-08 Whitemetal Inc. Liquid sand blast nozzle and method of using same

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3646709A (en) * 1970-12-17 1972-03-07 Matthew P Nolan Wet sandblast gun
DE8536518U1 (de) * 1985-12-24 1986-03-13 Blaha, Edgar, 6688 Illingen Strahldüsenaufsatz zur Wasserzuführung bei Sandstrahlgebläsen

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2376616A (en) * 1944-01-18 1945-05-22 Metalweld Inc Sandblasting apparatus
DE2724318A1 (de) * 1977-05-28 1978-11-30 Peiniger Ernst Gmbh Verfahren und anlage zum druckluftstrahlen
AU553658B2 (en) * 1983-04-27 1986-07-24 Bolrette Pty. Ltd. Abrasive blasting apparatus
US4922664A (en) * 1987-05-06 1990-05-08 Whitemetal Inc. Liquid sand blast nozzle and method of using same
US4817342A (en) * 1987-07-15 1989-04-04 Whitemetal Inc. Water/abrasive propulsion chamber
DE9000178U1 (de) * 1990-01-09 1990-03-15 BeHaS Sandstrahlsysteme GmbH, 5100 Aachen Düsenvorrichtung für Sandstrahlgeräte

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
HOCH-UND TIEFBAU Bd. 9, Nr. 9, 1988, Seiten 31 - 35 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2753643A1 (fr) * 1996-09-24 1998-03-27 Loubeyre Patrick Dispositif de commande d'une installation de nettoyage de surfaces contaminees
EP0832718A1 (fr) * 1996-09-24 1998-04-01 Patrick Loubeyre Dispositif de commande d'une installation de nettoyage de surfaces contaminées
PL428812A1 (pl) * 2019-02-04 2019-10-21 Land Reko Spółka Z Ograniczoną Odpowiedzialnością Spółka Komandytowa Zawór ścierniwa, zwłaszcza piaskarki

Also Published As

Publication number Publication date
DE4201860C1 (enrdf_load_stackoverflow) 1993-06-24

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