WO2005039825A1 - A method and a device for surface cleaning - Google Patents

A method and a device for surface cleaning Download PDF

Info

Publication number
WO2005039825A1
WO2005039825A1 PCT/NO2004/000318 NO2004000318W WO2005039825A1 WO 2005039825 A1 WO2005039825 A1 WO 2005039825A1 NO 2004000318 W NO2004000318 W NO 2004000318W WO 2005039825 A1 WO2005039825 A1 WO 2005039825A1
Authority
WO
WIPO (PCT)
Prior art keywords
nozzle holder
fluid
abrasive agent
accordance
tube
Prior art date
Application number
PCT/NO2004/000318
Other languages
English (en)
French (fr)
Inventor
Elmund Harestad
Valter Harestad
Original Assignee
Watech As
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 Watech As filed Critical Watech As
Publication of WO2005039825A1 publication Critical patent/WO2005039825A1/en

Links

Classifications

    • 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
    • B24C11/00—Selection of abrasive materials or additives for abrasive blasts
    • 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
    • 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
    • B24C7/0007—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

Definitions

  • This invention relates to a method and a device for surface cleaning. More particularly, it concerns a method, in which there is preferably used a ceramic abrasive material which is mixed into a fluid, after which the mixture of fluid and abrasive material flows through a feed hose up to a cleaning gun. By means of a rotating nozzle in the feeding gun, the mixture of fluid and abrasive material is directed towards the surface which is to be cleaned.
  • the invention also comprises a device for practicing the method.
  • the invention has as its object to remedy or reduce at least one of the drawbacks of the prior art.
  • a pump supplies a mixing unit for abrasive material and fluid with a fluid under pressure.
  • the pressure is most advantageously in the order of 900 bars, but can be varied within wide limits according to what materials are to be cleaned.
  • the abrasive material is normally formed by a ceramic material, for example sand, whereas the fluid, in by far the most cases, is water, to which chemicals have possibly been added in order to prevent ice formation.
  • the term sand is used for the abrasive material, whereas water represents the fluid.
  • the stream of water from the pump is divided into a first partial stream which flows through a first control valve, possibly an adjustable throat, and further through the feed hose to a cleaning gun.
  • a second partial stream flows through a second control valve into a pressure-tight sand tank filled with sand.
  • a mixture of sand and water flows via an outlet pipe out of the sand tank and is directed into the first partial stream.
  • the mixture of water and sand is directed into a spindle tube which is rotating about its longitudinal axis .
  • a spindle sub comprising a relatively short nipple tube.
  • the nipple tube is preferably made from tungsten carbide.
  • a nipple gasket encircling the nipple tube seals against the spindle tube.
  • the nipple gasket may with advantage be made from a synthetic material containing some glass.
  • the spindle tube is provided with a nozzle holder co-rotating with the spindle tube.
  • the nozzle holder may be provided with one or more nozzles, the nozzles being assigned suitable directions of flow relative to the axis of rotation.
  • the nozzles may be arranged in such a way that the jets from the nozzles will intersect at a distance from the nozzle holder.
  • the distance between the nozzle holder and the surface to be cleaned it may be controlled how large a surface the jet is to cover, the jet being able to work in one point when said distance matches the distance of the point of intersection between the jets.
  • the nozzles may be placed ⁇ n such a way that the reaction force from the out-flowing water helps to put the nozzle holder into rotation.
  • the relative portions of water and sand flowing out of the mixing unit can be adjusted by, among other things, adjusting the through-put of the first and the second control valves .
  • control valves can, with advantage, be connected to a control system, in which water-sand ratios and also water pressure are pre-programmed, and in which the operator can easily select a program during the work.
  • the invention Compared with the prior art, the invention contributes to an increased yield, reduced relative energy consumption, improved work environment and operator safety.
  • the invention represents a method which, when used sensibly, can be used also in explosion-hazardous areas .
  • Figure 1 shows a plant for surface cleaning including a pump, a mixing unit and a cleaning gun
  • Figure 2 shows a principle drawing of the mixing unit , arrows indicating flow directions
  • Figure 3 shows a longitudinal section through the cleaning gun
  • Figure 4 shows, on a larger scale, a section of the cleaning gun of Figure 3 ;
  • Figure 5 shows a nozzle holder, in which the nozzles are placed in such a way that the jets from the nozzles will intersect.
  • the reference numeral 1 identifies a plant for surface cleaning, including a pump 2 pumping water under pressure to a mixing unit 4 for water and sand, and a cleaning gun 6 connected to the mixing unit 4 by means of a feed hose 8.
  • a sand tank 10 In the mixing unit 4 there is placed a sand tank 10, see Figure 2.
  • the sand tank 10 is provided with a filling opening 12 for sand.
  • Water from the pump 2 is supplied to the mixing unit 4 by way of a supply pipe 14.
  • the water stream is then divided!, and a first water stream is directed to a first control valve 16, further to a preferably adjustable throat 18 and then on to the feed hose 8, these components forming a first flow path.
  • a second water stream is directed by way of a second control valve 20 and an inlet pipe 22 to the sand tank 10. From the bottom portion of the sand tank 10 sand and water are directed via an outlet pipe 24 into the first water stream upstream of the feed hose 8, the components 20, 22 and! 24, together with the sand tank 10, forming a second flow path.
  • the throat 18 is adjusted to produce a pressure drop in the first water stream, corresponding to the pressure drop experienced by the second water stream when flowing tb_rough, among other things, the sand in the sand tank 10.
  • control valves 16 and 20 are used in order to set the relative flow rate through the sand tank 10 and may with advantage be connected to a control plant, not shown.
  • the cleaning gun 6 includes a gun housing 26, see Figure 3, a tube housing 28 projecting forwards from the gun housing 26 and a bearing housing 30 projecting rearwards from the gun housing 26.
  • a grip 32 is provided with a trigger 34, t_he trigger 34, when operated, being arranged to start, via a not shown connection to the not shown control system, the supply of water and sand in a manner known in itself, through the feed hose 8.
  • the grip 32 is connected to the gun housing 26.
  • a support 36 is arranged to loear against the operator's shoulder portion.
  • the support 36 is also connected to the gun housing 26.
  • a rotatable spindle tube 38 extends through respective through bores 40, 42 and 44 of the bearing housing 30, the gun housing and the tube housing 28.
  • the spindle tube is supported by means of bearings 46 in the bearing housing 30 and by a bearing 46' in the projecting end portion of the tube housing 28.
  • the spindle tube 38 is connected to a nozzle holder 52 co-rotating with the spindle tube 38.
  • the nozzle holder 52 is provided with nozzles 54 communicating with the spindle tube 38 via bores 56.
  • the feed hose 8 is connected by means of a nipple 58 to a through-bore nipple tube holder 60, see Figure 4.
  • the nipple tube holder 60 is connected to the bearing housing 30 by mans of threads 62.
  • a nipple tube 64 concentric to the spindle tube 38, is placed sealingly, by means of a gasket 66, in a bore 68 of the nipple tube holder 60.
  • a locking washer 70 prevents the nipple tube 64 from being pushed out of the nipple tube holder 60 during operation.
  • the nipple tube 64 projects into the spindle tube 38 and is sealingly encircled by a nipple gasket 72 sealing against the bore 74 of the spindle tube.
  • a protective sleeve 76 encircles the connection of the feed hose 8 to the cleaning gun 10, see Figure 3.
  • the nipple gasket 72 rotates on the nipple tube 64, preventing water and sand from penetrating into the bearing housing 30.
  • water flows in from the pump 2 through the supply pipe 14 and is divided into two streams of water, the relative flow rates depending on the setting of the control valves 16, 20.
  • the first water stream is directed through a throat 18, whereas the second water stream flows via the inlet pipe 22 to the sand tank 10.
  • the sand tank 10 the water entrains sand before flowing out through the outlet pipe 24 and then being directed into tlie first water stream before water and sand flow to the cleaning gun 6 via the feed hose 8.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sink And Installation For Waste Water (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Cleaning By Liquid Or Steam (AREA)
  • Cleaning In General (AREA)

Abstract

Sammendrag Fremgangsmåte og anordning for overflaterensing hvor et slitemiddel blandes med et fluid før blandingen sprøytes mot den overflate som skal renses, idet en pumpe (2) forsyner en rensepistol (6) med fluid, og hvor at rensemidlet og fluidet blandes sammen før det sammen strømmer gjennom mateslangen (8) til rensepistolen (6).
PCT/NO2004/000318 2003-10-24 2004-10-20 A method and a device for surface cleaning WO2005039825A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20034755 2003-10-24
NO20034755A NO319655B1 (no) 2003-10-24 2003-10-24 Anordning for overflaterensing

Publications (1)

Publication Number Publication Date
WO2005039825A1 true WO2005039825A1 (en) 2005-05-06

Family

ID=29775114

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NO2004/000318 WO2005039825A1 (en) 2003-10-24 2004-10-20 A method and a device for surface cleaning

Country Status (2)

Country Link
NO (1) NO319655B1 (no)
WO (1) WO2005039825A1 (no)

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3323257A (en) * 1964-08-20 1967-06-06 Rocco P Fonti Systems for underwater sandblasting
US4936059A (en) * 1987-11-16 1990-06-26 Flow Industries, Inc. Abrasive swivel assembly and method
US4947589A (en) * 1989-07-24 1990-08-14 Truman's Inc., Ohio Corporation Sandblasting valving device
EP0514945A1 (de) * 1991-05-23 1992-11-25 PRO AQUA GERÄTE GmbH Wasser/Sand-Dosiergerät
US5283991A (en) * 1992-09-08 1994-02-08 Josef Keizers Sandblasting method and a moist-sand blasting apparatus
US5536200A (en) * 1993-02-03 1996-07-16 Kiess; Karl H. Nozzle of a sand blaster for dust-free blasting of planar surfaces
DE29612046U1 (de) * 1996-07-11 1996-09-12 Otto Christ GmbH & Co., 87734 Benningen Vorrichtung zum Reinigen von verschmutzten Oberflächen
US5992404A (en) * 1997-03-07 1999-11-30 Jenoptik Aktiengesellschaft Process and device for clearing out joints in masonry
US6273512B1 (en) * 1999-09-09 2001-08-14 Robert C. Rajewski Hydrovac excavating blast wand

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8708499D0 (en) * 1987-04-09 1987-05-13 Baldwin & Stanton Ltd Abrasive blasting apparatus
US4901928A (en) * 1988-10-04 1990-02-20 Stripping Technologies Inc. Pressure hose handle and system
US6315648B1 (en) * 1998-03-13 2001-11-13 Dana L. Neer Apparatus for pressure treating a surface

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3323257A (en) * 1964-08-20 1967-06-06 Rocco P Fonti Systems for underwater sandblasting
US4936059A (en) * 1987-11-16 1990-06-26 Flow Industries, Inc. Abrasive swivel assembly and method
US4947589A (en) * 1989-07-24 1990-08-14 Truman's Inc., Ohio Corporation Sandblasting valving device
EP0514945A1 (de) * 1991-05-23 1992-11-25 PRO AQUA GERÄTE GmbH Wasser/Sand-Dosiergerät
US5283991A (en) * 1992-09-08 1994-02-08 Josef Keizers Sandblasting method and a moist-sand blasting apparatus
US5536200A (en) * 1993-02-03 1996-07-16 Kiess; Karl H. Nozzle of a sand blaster for dust-free blasting of planar surfaces
DE29612046U1 (de) * 1996-07-11 1996-09-12 Otto Christ GmbH & Co., 87734 Benningen Vorrichtung zum Reinigen von verschmutzten Oberflächen
US5992404A (en) * 1997-03-07 1999-11-30 Jenoptik Aktiengesellschaft Process and device for clearing out joints in masonry
US6273512B1 (en) * 1999-09-09 2001-08-14 Robert C. Rajewski Hydrovac excavating blast wand

Also Published As

Publication number Publication date
NO20034755D0 (no) 2003-10-24
NO319655B1 (no) 2005-09-05
NO20034755L (no) 2005-04-25

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