WO1984003247A1 - Appareil et procede de sablage - Google Patents

Appareil et procede de sablage Download PDF

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Publication number
WO1984003247A1
WO1984003247A1 PCT/GB1984/000055 GB8400055W WO8403247A1 WO 1984003247 A1 WO1984003247 A1 WO 1984003247A1 GB 8400055 W GB8400055 W GB 8400055W WO 8403247 A1 WO8403247 A1 WO 8403247A1
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WO
WIPO (PCT)
Prior art keywords
shot
reservoir
blasting
nozzle
vehicle
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.)
Ceased
Application number
PCT/GB1984/000055
Other languages
English (en)
Inventor
Michael Potts
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.)
FRAIS ROGER MARK
Original Assignee
FRAIS ROGER MARK
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 FRAIS ROGER MARK filed Critical FRAIS ROGER MARK
Publication of WO1984003247A1 publication Critical patent/WO1984003247A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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 present invention relates to shot blasting.
  • Shot blasting involves directing a shot material entrained in a jet of air on to a surface to be treated and is used in various applications, for example the removal of paint, dirt or corrosion products (eg.rust).
  • the most commonly used shot material is sand, and another material is copper slag. The choice depends upon the particular application and is well understood in the art.
  • shot blasting is also applied to the on-site treatment of structures as, or as the first step of, a renovation operation.
  • Objects of the present invention are to provide improved apparatus for, and an improved method of, such on-site use.
  • apparatus for shot blasting which comprises a transport vehicle having positioned thereon a shot-material reservoir, a shot-material outlet at the bottom region of said reservoir, a source of compressed air and conduit means adapted and arranged for conveying a flow of compressed air from said source to a shot-blasting nozzle whilst collecting shot material from said outlet so that said nozzle is supplied with a shot blasting mixture of air and shot material, the size of said reservoir being such that it can accommodate an amount of shot-material at least sufficient to supply the nozzle with said mixture for a period of at least four hours.
  • On-site shot blasting has heretofore been carried out using portable equipment. In a typical case the reservoir holds a supply of shot material sufficient for 20 minutes of blasting.
  • this reservoir When this reservoir is exhausted it is de-pressurized and refilled manually, usually from a sack.
  • the resulting interruptions of the blasting operation account for a loss of on-site time of as much as 60% and an economically significant proportion of the sand or other shot material is lost by spillage.
  • the interruptions are reduced substantially with consequent saving.
  • the intervals of four hours or more between refilling operations enable the refilling to be in the form of mechanised filling from a supply tanker with substantial elimination of loss by spillage. It is not necessary for the tanker to remain on or in the neighbourhood of the working site, as would be necessary for refilling at intervals of 20 minutes or other short duration.
  • the reservoir may be made much larger than is required to give a four hour working period, a reservoir of such volume as to accommodate at least 4000 Kg of sand (or substantially 5300 Kg of copper slag which is more dense than sand) being preferred.
  • the transport vehicle has at least four driving wheels and is advantageously a low-load truck or low-load vehicle of the articulated type.
  • Such vehicles can be driven to the majority of working sites, including sites at a distance from a roadway.
  • the or each reservoir is provided with valve means for halting the flow of the compressed air at a position upstream of the outlet of the or each reservoir. It happens in practice that a blockage can occur in the flow of the sand or other shot material from a reservoir to the conduit means aforesaid. Halting the flow of compressed air to the shot-material outlet of the reservoir, at least assists the clearance of the blockage especially if the reservoir is of the pressurised type and the flow of compressed air thereto is maintained.
  • An especially useful arrangement is to have the valve means provided with a remotely operable actuator. When, as preferred, the actuator is mounted with the blasting nozzle or otherwise so mounted as to be accessible to the operator at the blasting site, the clearance of most blockages can be effected with little loss of blasting time.
  • Fig.1 is a side elevation of an embodiment of an apparatus provided in accordance with the invention
  • Fig.2 shows a modification of the apparatus of
  • Fig.3 shows part of the apparatus of Figs. 1 and
  • Fig.4 is a cross-section showing the form of remote-controlled valves employed in the apparatus.
  • a 6-wheeled vehicle 1 with all wheels driven has permanently mounted thereon a pair of diesel engined air-compressors 2 each giving an output of 250 cubic feet (7 cubic metres) per minute.
  • Two shot material reservoirs 3 and 4 are mounted on the low-loader platform, 5 of the vehicle. Each reservoir has a volume sufficient to hold 8000 Kg . of sand.
  • a conduit system 6 is provided for pressurising the reservoirs via remotely actuated valve devices 7 & 8.
  • a second conduit system 9 with remotely actuated valve devices 10 & 11 provides an air supply to one or both of a pair of shot blasting nozzles 12 & 13 via pick-up arrangements of conventional design, positioned at the bottoms of the reservoirs, for feeding the sand or other shot material to flexible connectors 14 & 15 and thence to the nozzles 12 & 13.
  • Valve levers 16 & 17 on the nozzles open valves 10 end 11 when released by the operator thereof.
  • An electrical or pneumatic system not shown, links these levers with their valves.
  • the sand content of the stream ejected from a nozzle on to the surface 18 to be treated typically has a sand content of 10% by volume and a velocity of the order of 200 Km per hour.
  • each reservoir For typical blasting operations, the reservoirs require replenishment only at intervals of 10 mandays.
  • each reservoir In a modified form of the apparatus, each reservoir is divided internally into two parts, each of which communicates with a nozzle. With the two nozzles operated by a pair of operators, replenishment is required at 5 man-day intervals. Replenishment of the reservoir is by a tanker vehicle specially driven to the site, only a small fraction of the tanker's available operational time being required for this purpose.
  • Examples of surfaces which can be treated with the apparatus are the exterior surfaces of gasholers and cargo containers of the kind carried by container ships.
  • the shot blasting operation can be commenced, without significant delay, upon arrival of the vehicle with the reservoirs already containing the sand or other shot material. It is not necessary for the loading to be complete. Thus a residual load from another working site can be employed, at least for starting the blasting operation. Having a multi-sheel drive on the vehicle gives useful access to working sites over a wide range of terrains, virtually independently of the weather.
  • Fig.2 shows a reservoir 116 which replaces the reservoirs 3 & 4 of Fig.1.
  • Each of these reservoirs has a manhole arrangement 17 and a tubular shot material entrance 18 with a cover 19 which is removable for connection of a supply conduit 20 for shot material 21.
  • Entrance 18 is fitted after supplying the shot material with a silica gell cartridge 22 for the absorption of moisture during periods when the filled reservoir is not in use.
  • An air compressor 2 supplies a conduit 23 provided with a non-return valve 24.
  • a branch conduit 25 supplies compressed air to reservoir 116 via a branch 26 beyond which the conduit has an extension fitted with a pressure relief valve 27 which is opened manually in preparation for filling the reservoir.
  • valve 27 is provided in combination with a pressure gauge.
  • conduit 23 extends to shot nozzle 12a. Shot material is collected from reservoir 116 via a passageway 28 positioned downstream of 8 constriction 29.
  • a valve 30 operable by a handle 16a and shown in further detail in Fig.3.
  • Valve 30 has an internal air passageway 31 leading to a port 32.
  • a handle 16, pivotally mounted at 33 carries a rubber gromet 34 which is brought into sealing arrangement with port 32 by the blasting operator at his working position.
  • Air at two atmospheres pressure above atmosphere is supplied to valve 30 by a flexible tube 35 connected with an inlet 36.
  • This tube leads from a manifold 37 fed from conduit 23 via a regulator 38, positioned as shown, and a line 39.
  • a branch 40 controls a shot delivery valve 41 which is closed to prevent the passage of shot material in the absence of an air flow through conduit 23.
  • Another branch , 41 of line 39 leads to manifold 37 vis 9 two-way valve arrangement 42 which diverts the flow from the compressor via an outlet 43 to atmosphere in the absence of a pressure build-up produced by closure of valve 30. Also connected with manifold 37 is a line 38 leading via a valve 44.
  • the pneumatic arrangements prevent the supply of compressed air to the reservoir or nozzle 12a when handle 16a is released.
  • those parts of the apparatus controlled by the handle 16a. preferably function to permit the shot blasting only when the pressure in the control system exceeds a minimum, eg. one atmosphere (ie. two atmospheres absolute).
  • a rubber hose part 50 which may be part of the conduit itself, has metal components 51 and 52 secured on opposite sides.
  • Component 52 is formed with an apex part 53 shaped to provide a recess 54.
  • a plunger 55 extends into recess 54 from a pneumatic actuator 56 of the diaphragm type and holds hose part 50 pinched to a fully closed state by component 52 except when an opening pressure is received by a control line such as line 39.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Road Paving Machines (AREA)
  • Air Transport Of Granular Materials (AREA)

Abstract

Un véhicule de transport (1) est pourvu d'un réservoir (3, 4) contenant un matériau de sablage et possédant au fond une sortie de matériau de sablage. Une source d'air comprimé (2) est acheminée par une conduite pour alimenter en air la tuyère de sablage (12, 13) avec le matériau de sablage récupéré de la sortie. Les dimensions de ce réservoir sont telles qu'il peut contenir une quantité de matériau de sablage suffisante pour alimenter la tuyère avec ce mélange pendant une période de quatre heures au moins. Des vannes de commande (10, 11) pour l'air comprimé et pour le matériau de sablage sont actionnées à distance par une poignée (16, 17) sur la tuyère (12, 13).
PCT/GB1984/000055 1983-02-22 1984-02-22 Appareil et procede de sablage Ceased WO1984003247A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB838304919A GB8304919D0 (en) 1983-02-22 1983-02-22 Apparatus for shot blasting

Publications (1)

Publication Number Publication Date
WO1984003247A1 true WO1984003247A1 (fr) 1984-08-30

Family

ID=10538421

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1984/000055 Ceased WO1984003247A1 (fr) 1983-02-22 1984-02-22 Appareil et procede de sablage

Country Status (3)

Country Link
EP (1) EP0145719A1 (fr)
GB (2) GB8304919D0 (fr)
WO (1) WO1984003247A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0683014A1 (fr) * 1994-05-13 1995-11-22 CINOMATIC S.r.l. Machine à hydro-jet de sable et/ou machine hydronettoyante à haute efficacité
US5481832A (en) * 1993-09-23 1996-01-09 Tirikos; Steven M. Bridge sand blasting support apparatus

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997049525A1 (fr) * 1996-06-27 1997-12-31 Wizard Technology Limited Dispositif de projection abrasive

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2763965A (en) * 1954-10-28 1956-09-25 Roy A Stokes Portable abrasive containing and feeding apparatus
US3399492A (en) * 1966-07-21 1968-09-03 C H Heist Ohio Corp Sandblast truck assembly
US3559343A (en) * 1968-07-05 1971-02-02 Heist Corp C H Sandblast truck
US4019284A (en) * 1975-07-07 1977-04-26 Hileman Jr Fred Lee Self-contained sandblasting apparatus

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1527333A (en) * 1977-02-01 1978-10-04 Shigyo G Mobile shot blasting apparatus for shot blasting the bottom of a ship or the like
EP0095232A3 (fr) * 1982-05-22 1985-10-09 Tilghman Wheelabrator Limited Dispositif de traitement au jet abrasif monté à l'intérieur d'un récipient transportable

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2763965A (en) * 1954-10-28 1956-09-25 Roy A Stokes Portable abrasive containing and feeding apparatus
US3399492A (en) * 1966-07-21 1968-09-03 C H Heist Ohio Corp Sandblast truck assembly
US3559343A (en) * 1968-07-05 1971-02-02 Heist Corp C H Sandblast truck
US4019284A (en) * 1975-07-07 1977-04-26 Hileman Jr Fred Lee Self-contained sandblasting apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5481832A (en) * 1993-09-23 1996-01-09 Tirikos; Steven M. Bridge sand blasting support apparatus
EP0683014A1 (fr) * 1994-05-13 1995-11-22 CINOMATIC S.r.l. Machine à hydro-jet de sable et/ou machine hydronettoyante à haute efficacité

Also Published As

Publication number Publication date
GB8404696D0 (en) 1984-03-28
GB2135917B (en) 1987-05-13
EP0145719A1 (fr) 1985-06-26
GB8304919D0 (en) 1983-03-23
GB2135917A (en) 1984-09-12

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