EP0025156A1 - Procédé et installation pour traiter des surfaces avec un jet abrasif humide - Google Patents

Procédé et installation pour traiter des surfaces avec un jet abrasif humide Download PDF

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Publication number
EP0025156A1
EP0025156A1 EP80105011A EP80105011A EP0025156A1 EP 0025156 A1 EP0025156 A1 EP 0025156A1 EP 80105011 A EP80105011 A EP 80105011A EP 80105011 A EP80105011 A EP 80105011A EP 0025156 A1 EP0025156 A1 EP 0025156A1
Authority
EP
European Patent Office
Prior art keywords
water
nozzle
line
container
tube
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Withdrawn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
EP80105011A
Other languages
German (de)
English (en)
Inventor
Karl J. Dipl.-Ing. Sprakel
Horst Müller
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.)
Myers-Europe Pumpen GmbH
Original Assignee
Myers-Europe Pumpen 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 Myers-Europe Pumpen GmbH filed Critical Myers-Europe Pumpen GmbH
Publication of EP0025156A1 publication Critical patent/EP0025156A1/fr
Withdrawn legal-status Critical Current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
    • B24C7/0007—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts the abrasive material being fed in a liquid carrier
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C3/00—Abrasive blasting machines or devices; Plants
    • B24C3/02—Abrasive blasting machines or devices; Plants characterised by the arrangement of the component assemblies with respect to each other
    • B24C3/06—Abrasive blasting machines or devices; Plants characterised by the arrangement of the component assemblies with respect to each other movable; portable

Definitions

  • the invention relates to a wet sandblasting method, in particular for underwater operation, in which a water-sand mixture is supplied in a metered amount per unit time to a nozzle and emerges from it in a jet of high pressure.
  • a method of this type is known in which dry sand is kept in a container which is connected to a nozzle via a valve and a sand line.
  • the nozzle is connected to a high-pressure water pump, forms a hard water jet and creates a negative pressure in the sand pipe, through which the sand is sucked out of the container.
  • the sand reaches the high-pressure water at most in a sufficiently uniform flow when the sand is filled into the container in an extremely dry state and can also be kept dry there.
  • an air compressor is required if you want to work under water at depths below 5m. All of this requires significant setup and ongoing operating costs.
  • air bubbles are conveyed to the nozzle together with the sand and are released from the water-sand jet emerging from the nozzle when working underwater and the visibility is considerably impaired.
  • the invention is therefore based on the object of designing a wet sandblasting method of the type described in the introduction, especially for underwater operation, in a cost-saving and effective manner.
  • This object is achieved in that a sand supply is suspended with water from ambient pressure, the suspension is introduced into a water stream by means of gravity and the water-sand mixture thus created is added to a high-pressure water jet at the outlet of the nozzle.
  • the method according to the invention can be carried out in such a way that the water flow is directed downward at the point at which the build-up is initiated and is kept in motion by a negative pressure which is generated in the nozzle by the high-pressure water jet.
  • the method according to the invention can also be carried out in such a way that the water flow at the point at which the suspension is initiated is generated by an additional water jet directed upwards.
  • a device has been created in which a container is provided for the preparation of the water-sand mixture, which contains a water-flowable, at least approximately vertical pipe, which is enclosed by a storage space for a sand reservoir suspended with water and only leaves a limited cross section that connects the storage space with a mixing chamber which is connected to the nozzle via a first line, the nozzle being connected directly to a high-pressure water pump through a second line.
  • a container is provided for the preparation of the water-sand mixture, which contains a water-flowable, at least approximately vertical pipe, which is enclosed by a storage space for a sand reservoir suspended with water and only leaves a limited cross section that connects the storage space with a mixing chamber which is connected to the nozzle via a first line, the nozzle being connected directly to a high-pressure water pump through a second line.
  • the wall area of the container adjacent to the lower end of the tube is preferably funnel-shaped and arranged coaxially with the tube.
  • connection of limited cross-section between the storage space and the mixing chamber can be created in that the tube delimits an annular gap between its open lower end and an adjacent wall area of the container.
  • the connection between the storage space and the mixing chamber can also be established through openings in the tube itself. In both cases, the cross-section of the connection between the storage space and the mixing chamber can easily be enlarged or reduced using known means and thereby adapt to different working conditions and sand grains.
  • the container is preferably open at the top and has a hanging device with which it can be hung from a quay, a ship, a drilling platform or the like.
  • the container also under water, can be hung in the vicinity of the work station, so that the first line leading from the container to the nozzle can be relatively short and, accordingly, the flow losses arising therein can be kept low.
  • the high-pressure water pump together with the associated drive is expediently on board the ship Drilling platform or the like arranged.
  • an embodiment of the device according to the invention is particularly suitable for this purpose, in which the upper end of the tube arranged in the container is designed as a water inflow and the container has an outlet below the mixing chamber which is connected to the nozzle by the first line.
  • This embodiment has the advantage of particular simplicity, especially when working under water, since water from the environment enters the upper end of the pipe, which is provided as a water inflow, and flows easily through the pipe from top to bottom as soon as high-pressure water exits the nozzle from the second line and there creates a negative pressure, which then easily reacts via the first line to the pipe in the container and causes a water flow to the nozzle.
  • the method according to the invention is to be carried out in such a way that the water flow at the point at which the suspension is initiated is generated by an upward additional water jet
  • another embodiment of the invention is particularly suitable for this, in which the first line connects the upper end of the tube to the nozzle and the container below the mixing chamber has an inlet which is connected to the high pressure water pump via a third line.
  • the additional effort for the third line is worthwhile in many cases primarily because it gives the possibility to work with the nozzle at a point that can be considerably higher than the container. At such a point, the work can also be interrupted without the risk of the first line becoming blocked.
  • the third line is connected to the high-pressure water pump via a gun on which the nozzle is arranged and via the second line ending at the gun.
  • the amount of water per unit of time which is passed through the third line into the mixing chamber need only be a small fraction, for example one tenth of the amount of water which is fed to the nozzle through the second line.
  • the device shown in FIGS. 1 and 2 is intended to carry out sandblasting work from a ship 10 on underwater parts of an oil rig 12, for example in order to expose these parts for a non-destructive testing of shell growth or the like.
  • a hanger 18 hangs a container 20 on a loading boom 14 of the ship 10.
  • the container 20 has a circular cylindrical main part 22 and a funnel-shaped wall region 24 adjoining it downwards, which opens into an outlet 26.
  • the outlet 26 is connected to a nozzle 30 belonging to a gun 32 through a first conduit 28 formed by an ordinary hose.
  • Gun 32 is held by a diver 34 and has an inlet 36 at which a second conduit 38 terminates.
  • the second line 38 is formed by a high-pressure hose and connects the gun 32 to a high-pressure water pump 40 on board the ship 10, which is driven by an engine 42.
  • the gun 32 has a branch 44 between the inlet 36 and the nozzle 30, to which a recoil nozzle 46, which is coaxial with the nozzle 30 but oppositely directed, is connected, which in operation produces a recoil which is in equilibrium with that of the nozzle 30 .
  • a hose connector 48 is screwed into the outlet 26 from below, which is lined with a wear sleeve 50.
  • a tube 52 is arranged in the container 20, which is guided in a height adjustable manner in a hub 54 and is clamped in such a height position with a screw 56 only indicated that between the lower end 58 of the tube 52 and the adjacent funnel-shaped wall area 24 of the Container 20 an annular gap 60 remains free.
  • the tube 52 is open at its lower end 58 as well as at its upper end 62, so that water from the environment can flow through the tube unhindered.
  • the interior of the container 20 around the tube 52 is provided as a storage space 64 for a sand reservoir 66.
  • the container 20 is open at the top; therefore and due to the suspension of the container under water, the sand reservoir 66 is constantly suspended with water.
  • the annular gap 60 connects the storage space 64 to a mixing chamber 68 formed between the lower tube end 58 and the upper end of the wear sleeve 50.
  • a vibrator 70 can be fastened to the container 20, which is connected to the ship 10 by an electrical, pneumatic or hydraulic line, not shown, and which vibrates the container by electromechanical, pneumatic-mechanical or hydraulic-mechanical means, if necessary, for example by loosen up the sand reserve 66 at the start of operation.
  • FIG. 2 also shows some details of the nozzle 30 in an enlarged axial section, including a hose connection piece 72 which is axially screwed into the nozzle and which is connected to the hose connection piece 48 by the first line 28. From the other, the front in operation and in Fig.2 upper side is in the nozzle 30. Nozzle extension 74 is screwed in, and a nozzle insert 76 is tightly clamped between the latter and the hose connector 72.
  • the nozzle insert 76 has an axial channel 78 which is lined with a wear sleeve 80 which also extends through the hose connector 72.
  • an annular channel 82 is formed, which is connected on the one hand via a pipe bend 84 and the branch 44 to the inlet 36 and on the other hand is connected to the interior of the nozzle extension 74 by a plurality of channels 86.
  • the channels 86 are all around at regular intervals arranged the axis of the nozzle 30 and converge at an acute angle.
  • FIGS. 3 to 5 has numerous components which correspond to the components described with reference to FIGS. 1 and 2 and are provided with the same reference numerals, or components in FIGS. 1 and 2 correspond at least analogously and in this case in FIG .3 to 5 have been given the same reference numbers with a distinctive index mark.
  • the container 20 has at its lower end, instead of the outlet 26 shown in FIGS. 1 and 2, an inlet 90 which is connected by a third line 92 to an additional branch 44 'of the gun 32 and via this and the first line 38 to the high pressure water pump 4 0 is connected.
  • the inlet 90 delimits the mixing chamber 68 downward and contains a water jet nozzle 94 which is arranged in the middle of the mixing chamber 68 and is directed axially upward carries a Venturi nozzle 100.
  • the Venturi nozzle 100 is coaxial with the water jet nozzle 94 and the distance.
  • Pipe 98 arranged and limits the mixing chamber 68 upwards.
  • the vertical tube 52 is also arranged in the container 20; 4 and 5, this is rotatably guided on the cylindrical outer surface of the spacer tube 98 and / or the Venturi nozzle 100.
  • the grub screws 96 extend through slots 102 of the tube 52 which are elongated in the circumferential direction, so that it can be rotated by a limited angle, but cannot be pulled out of the container 20 without the inlet 90.
  • holes 60 ' are provided in the tube 52 and in the spacer tube .98, which are aligned in pairs in accordance with FIG. 5, so that the tube 52 also leaves a limited cross section here, which separates the storage space 64 with the Mixing chamber 68 connects.
  • This cross section can be reduced by rotating the tube 52 and can also be closed completely, which is particularly useful in the case of interruptions in operation, for example for refilling the storage space 64.
  • a ring of spokes 104 is fastened to its upper end according to FIG. 4, which is centered on the inner wall of the main part 22 of the container 20 and can be clamped with a clamping screw 106.
  • the vertical tube 52 could, however, also be vertically adjustable in the manner described with reference to FIG to be released or to be partially or completely covered.
  • a line 28 ′ is fastened to the Venturi nozzle 100, which corresponds to the first line 28 in FIGS. 1 and 2, since it ends at the nozzle 30 in the same way as the line 28 and has the task of creating the water that is created in the mixing chamber 68 -Sand mix to promote nozzle 30.
  • Line 28 'could be attached to the top of tube 52; With regard to the adjustability of the tube 52, however, it is more expedient if the line 28 'according to FIGS. 4 and 5 is fastened to the Venturi nozzle 100, for example with a hose clamp 108, if the line 28' is formed by a hose.
  • the pistol 32 has a trigger 110 with which the diver 34 can open an inlet valve 112 which is biased in the closing direction.
  • This arrangement which is self-evident, is shown schematically in FIG. 4 in order to clarify that, in the exemplary embodiment according to FIGS. 3 to 5, the branch 44 ′ (as well as the branch 44) is arranged between the inlet valve 112 and the nozzle 30.
  • the branch 44 ′ (as well as the branch 44) is arranged between the inlet valve 112 and the nozzle 30.
  • the line cross sections are dimensioned such that the amount of water exiting through the water jet nozzle 94 per time unit is approximately 10% of the amount of water exiting through the channels 86.
  • the water jet emerging from the water jet nozzle 94 flows through the Venturi nozzle 100 and generates a negative pressure, through which water-sand mixture is sucked from the storage space 64 into the mixing chamber 68 in order to be carried away from there into the line 28 ′.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Nozzles (AREA)
  • Jet Pumps And Other Pumps (AREA)
EP80105011A 1979-08-22 1980-08-22 Procédé et installation pour traiter des surfaces avec un jet abrasif humide Withdrawn EP0025156A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2934023 1979-08-22
DE19792934023 DE2934023A1 (de) 1979-08-22 1979-08-22 Nasssandstrahl-verfahren und einrichtung zum durchfuehren des verfahrens

Publications (1)

Publication Number Publication Date
EP0025156A1 true EP0025156A1 (fr) 1981-03-18

Family

ID=6079057

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80105011A Withdrawn EP0025156A1 (fr) 1979-08-22 1980-08-22 Procédé et installation pour traiter des surfaces avec un jet abrasif humide

Country Status (3)

Country Link
EP (1) EP0025156A1 (fr)
DE (1) DE2934023A1 (fr)
GB (1) GB2056333A (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1984001738A1 (fr) * 1982-10-25 1984-05-10 Keizers Sigrid Procede de sablage au moyen de sable humide et appareil de projection de sable pour la mise en oeuvre du procede
EP0164914A1 (fr) * 1984-05-15 1985-12-18 N.I.S. Engineering Limited Méthode de nettoyage par projection
DE3722258A1 (de) * 1987-07-06 1989-01-19 Pro Aqua Geraete Gmbh Vorrichtung zum herstellen eines unter hochdruck stehenden granulat/fluid-gemisches
CN102653077A (zh) * 2010-12-10 2012-09-05 株式会社富士工程 喷砂材料及喷砂方法
CN114593641A (zh) * 2022-02-28 2022-06-07 哈尔滨理工大学 一种喷砂型水炮结构

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2075879B (en) * 1980-05-16 1983-04-07 Link John Cleaning apparatus and method
GB9023334D0 (en) * 1990-10-26 1990-12-05 Marconi Gec Ltd Method and apparatus for removing surface material underwater by erosion
DE4239545A1 (de) * 1992-11-25 1994-05-26 Alba Ind & Umweltschutzservice Hochdruckpistole für Unterwasserarbeiten

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1940539A (en) * 1932-06-08 1933-12-19 Fritsche Rudolf Device for making corrections on lithographic printing surfaces
US2366763A (en) * 1943-04-26 1945-01-09 Pangborn Corp Hydraulic sand feeder
US2372957A (en) * 1943-12-23 1945-04-03 Pangborn Corp Hydraulic sand feeder
DE924075C (de) * 1952-05-31 1955-02-24 Mariblast Corp Sandstrahl-Verfahren und -Vorrichtung zur Oberflaechenbehandlung
US3034263A (en) * 1959-08-07 1962-05-15 Ruric N Mcdaniel Sand blasting apparatus
US3256642A (en) * 1963-11-07 1966-06-21 Rocco P Fonti Underwater sandblasting gun
US3323257A (en) * 1964-08-20 1967-06-06 Rocco P Fonti Systems for underwater sandblasting
US3852918A (en) * 1972-03-29 1974-12-10 R Black Gas-abrasive mixing and feeding device
US4125969A (en) * 1977-01-25 1978-11-21 A. Long & Company Limited Wet abrasion blasting

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1940539A (en) * 1932-06-08 1933-12-19 Fritsche Rudolf Device for making corrections on lithographic printing surfaces
US2366763A (en) * 1943-04-26 1945-01-09 Pangborn Corp Hydraulic sand feeder
US2372957A (en) * 1943-12-23 1945-04-03 Pangborn Corp Hydraulic sand feeder
DE924075C (de) * 1952-05-31 1955-02-24 Mariblast Corp Sandstrahl-Verfahren und -Vorrichtung zur Oberflaechenbehandlung
US3034263A (en) * 1959-08-07 1962-05-15 Ruric N Mcdaniel Sand blasting apparatus
US3256642A (en) * 1963-11-07 1966-06-21 Rocco P Fonti Underwater sandblasting gun
US3323257A (en) * 1964-08-20 1967-06-06 Rocco P Fonti Systems for underwater sandblasting
US3852918A (en) * 1972-03-29 1974-12-10 R Black Gas-abrasive mixing and feeding device
US4125969A (en) * 1977-01-25 1978-11-21 A. Long & Company Limited Wet abrasion blasting

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1984001738A1 (fr) * 1982-10-25 1984-05-10 Keizers Sigrid Procede de sablage au moyen de sable humide et appareil de projection de sable pour la mise en oeuvre du procede
EP0164914A1 (fr) * 1984-05-15 1985-12-18 N.I.S. Engineering Limited Méthode de nettoyage par projection
DE3722258A1 (de) * 1987-07-06 1989-01-19 Pro Aqua Geraete Gmbh Vorrichtung zum herstellen eines unter hochdruck stehenden granulat/fluid-gemisches
CN102653077A (zh) * 2010-12-10 2012-09-05 株式会社富士工程 喷砂材料及喷砂方法
CN102653077B (zh) * 2010-12-10 2016-06-29 株式会社富士工程 喷砂材料及喷砂方法
CN114593641A (zh) * 2022-02-28 2022-06-07 哈尔滨理工大学 一种喷砂型水炮结构

Also Published As

Publication number Publication date
GB2056333A (en) 1981-03-18
DE2934023A1 (de) 1981-03-12

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Inventor name: MUELLER, HORST

Inventor name: SPRAKEL, KARL J., DIPL.-ING.