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WO1988004220A1 - Method and apparatus for wet abrasive blasting - Google Patents

Method and apparatus for wet abrasive blasting Download PDF

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Publication number
WO1988004220A1
WO1988004220A1 PCT/GB1987/000856 GB8700856W WO8804220A1 WO 1988004220 A1 WO1988004220 A1 WO 1988004220A1 GB 8700856 W GB8700856 W GB 8700856W WO 8804220 A1 WO8804220 A1 WO 8804220A1
Authority
WO
WIPO (PCT)
Prior art keywords
nozzle
accordance
abrasive
inlet
fluid
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/GB1987/000856
Other languages
French (fr)
Inventor
Kenneth Gordon Mccoll
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.)
KG Mccoll & Co Ltd
Original Assignee
KG Mccoll & Co Ltd
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 KG Mccoll & Co Ltd filed Critical KG Mccoll & Co Ltd
Publication of WO1988004220A1 publication Critical patent/WO1988004220A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/14—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas designed for spraying particulate materials
    • B05B7/1404—Arrangements for supplying particulate material
    • B05B7/1431—Arrangements for supplying particulate material comprising means for supplying an additional liquid
    • B05B7/1436—Arrangements for supplying particulate material comprising means for supplying an additional liquid to a container where the particulate material and the additional liquid are brought together
    • 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
    • B24C5/04—Nozzles therefor
    • 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
    • B24C7/0038—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 the blasting medium being a gaseous stream
    • 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

Definitions

  • This invention relates to a method and an apparatus for wet abrasive blasting of, for example, steel, stone, wood and structures constructed therefrom.
  • a method of cleaning structures which comprises directing a jet of fluid with entrained abrasive at the structure characterised in that the said jet is surrounded by a high velocity gas jet.
  • the high velocity gas jet which provides the main acceleration and propulsion force, is provided coaxially about the fluid abrasive jet.
  • the abrasive such as sand
  • the fluid such as water
  • a gravity fed arrangement or from a container which is subject to pressurisation.
  • This invention also provides an apparatus for wet sand blasting of structures, the apparatus including a noszle structure incorporating a high pressure fluid feed in operative combination with an inlet for abrasive arranged such that the fluid flow draws in and entrains the abrasive, the noszle structure having an outlet surrounded by a coaxially positioned annular nozzle assembly supplied with compressed gas.
  • the abrasive is sand fed to the nozzle structure from a container which is subject to compressed gas such as air, or in an alternative arrangement the sand is fed from a hopper which includes a compressed air feed serving to agitate or fluidise the sand.
  • the compressed air feed is effected through a pipe with a plurality of apertures along its length, the pipe extending through the hopper and the feed pipe thereby serving to fluidise the sand and improve the flow.
  • Figure la shows diagrammatically an arrangement for the nozzle
  • Figure 1b shows a first modification
  • Figure 1c shows a second modification
  • Figure 2a shows one method of feeding sand to the nozzle utilising a hopper
  • Figure 2b shows an alternative method of feeding sand and water to the nozzle
  • Figure 3 shows a further method of feeding sand to a nozsle using a compressed air source feeding a container
  • Figure 4 shows a more detailed construction of nozzle assembly
  • Figure 5 shows an alternative construction of nozzle.
  • the object of the apparatus according to the invention is to provide a high velocity jet of fluid such as water with entrained abrasive, sand as example, suitable for blasting metal or the like surfaces to clean same.
  • a nozzle 1 which incorporates a high pressure water feed 2 with an orifice 3 of small size which feeds a nozzle chamber 4. Dry sand is fed through an inlet 5 and this sand is entrained by the water issuing into the chamber 4 to thereby produce a high velocity water and sand jet 6.
  • a coaxially positioned annular nozzle assembly 7 is provided which is fed with high pressure air 8. The air supply 8 thus surrounds the water and sand issuing from jet 6 and serves to accelerate both the water and the sand with a resultant improved cleaning effect on the structure.
  • Figure 1b shows an advantageous modification wherein the high velocity water and sand jet issues from the nozzle 1 at 6a with a small angle of divergence.
  • Figure 1c shows a further modification where small transversely acting air jets 6b are arranged to impinge on the jet 6. In both these arrangements the acceleration of the centre jet of water and sand is improved due to the interference with the air jet 8.
  • FIG. 2a the feed pipe 20 which serves to couple with the sand inlet 5 of Figures la, 1b, 1c is fed with sand from a hopper 21.
  • a compressed air feed pipe 22 extends through the centre of the hopper and coaxially along the pipe 20.
  • This pipe 22 is provided with spaced apertures 23a along its length and is fed with compressed air which serves to agitate the sand, thus improving the flow characteristics. Further compressed air feed points are provided at 23 which agitate sand within the hopper.
  • FIG 3 a further alternative arrangement is provided whereby the feed pipe 30 for sand which connects with the inlet 5 of Figure 1 is supplied from a pressure pot 31 containing sand which is fed with compressed air through an inlet 32.
  • This arrangement causes the sand to be fed into the nozzle assembly under pressure thus improving the take-up.
  • the feed pipe 30 includes a valve 33 followed in the flow direction by a compressed air inlet from pipe 34 to agitate the sand.
  • a pipe 35 provides for pressure equalisation.
  • FIG 4 A preferred construction for the noszle assembly shown in Figure la is illustrated in Figure 4, and as shown the nozzle includes an inlet 40 for high pressure water and inlet 40a for sand which is fed from either the hopper of Figure 2a or the compressed air supply pot of Figure 3.
  • the high pressure water issues through a small orifice 41 into a collecting or entrainment chamber 42 whereby sand from the inlet 40a is mixed therewith.
  • the entrained sand and high pressure water passes through ceramic nozzle 43 and issues in the form of a high pressure jet 44 at the nozzle outlet.
  • Located around the nozzle 43 is a coaxial annular noszle chamber 47 which is fed with compressed air through an inlet 45.
  • the compressed air exhausts from an annular nozzle 46 which is positioned about the nozzle 43 and thus provides the improvement in the cleaning action of the water and sand jet.
  • the chamber 42 and nozzle 43 are mounted in a gas- tight manner within a housing 50 using a seal 51.
  • the housing has an insert body 52 mounted at the forward end and secured by bolts 53.
  • the insert body defines a coaxial air receiving chamber 54 feeding the nozzle chamber 47.
  • the compressed air pressure used will be of the order of 120 lb/in 2 and the water pressure applied is some 1000 lb/in 2 .
  • the compressed air pressure used for agitation is about 20 lb/in 2 an d the height of the hopper 21 above the nozzle is about 2 metres.
  • Figure 5 shows an alternative nozzle assembly wherein like parts to those in Figure 4 have the same reference numerals.
  • This embodiment however has a single feed 48 for a sand water pre-mixture. Operation is otherwise similar.
  • the premixed sand and water may be supplied by an arrangement as shown in Figure 2b, as example, wherein sand 205 is contained in a hopper 210 also containing water up to level 240.
  • the sand and water are agitated by compressed air feed in through nozzles 230 and along an aperture pipe 220.
  • the sand/water mixture is drawn out through pipe using a pump or air operated ejector device (not shown) and fed to inlet 48 of the nozzle shown in Figure 5.
  • modified versions include the arrangements previously described in conjunction with Figures lb and 1c, wherein the water/sand nozzle 43 is modified to give a diverging component to the flow or the compressed air exhaust 46 is adapted to give an inwardly directed jet or component of flow.
  • the high pressure water supply is passed through a small orifice prior to mixing with the abrasive and this causes a fall in pressure and hence a degree of suction for ingesting the abrasive into the nozzle.
  • the modified form of Figure 5 there is no need for high pressure water and the abrasive is contained in the water as a slurry which is then blasted on to the work piece as before.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Nozzles (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Abstract

Nozzle apparatus for abrasively cleaning structures comprises an inlet (48) for a sand and water mixture, the inlet communicating with a chamber (42) leading to a nozzle (43). To improve the cleaning action a compressed air feed (45) is used feeding a nozzle (47) having an outlet (46) positioned coaxially about the outlet of nozzle (43). In this arrangement the jet of water with entrained sand is surrounded by a high velocity jet of air providing an improved cleaning action.

Description

TITLE
Method and Apparatus for Wet Abrasive Blasting
This invention relates to a method and an apparatus for wet abrasive blasting of, for example, steel, stone, wood and structures constructed therefrom.
It is known to clean structures of steel or the like by directing at the structure a jet of relatively high velocity water with entrained sand as abrasive. The sand is generally fed into the water stream by suction from a container at atmospheric pressure and a disadvantage of existing methods is that the velocity of the water jet with the entrained sand is not very high and thus the effectiveness of cleaning is poor. Further dry sand needs to be used with attendant high packaging costs. Problems also arise in relation to the method of feeding sand into the water stream as this can become - erratic and often an insufficient quantity of sand is entrained. Large quantities of water are also used together with expensive equipment. The area of the jet is also relatively small and these disadvantages can make the cleaning of structures uneconomic. The invention is principally intended to be applicable to cleaning structures of steel wood, stone and the like. This invention seeks to provide a method and apparatus which improves the effectiveness of the cleaning operation and, hence, improves the economics and retains complete dust suppression.
According to this invention, there is provided a method of cleaning structures which comprises directing a jet of fluid with entrained abrasive at the structure characterised in that the said jet is surrounded by a high velocity gas jet. In preferred arrangement the high velocity gas jet which provides the main acceleration and propulsion force, is provided coaxially about the fluid abrasive jet.
Preferably the abrasive, such as sand, is fed to the fluid such as water, using a gravity fed arrangement or from a container which is subject to pressurisation.
This invention also provides an apparatus for wet sand blasting of structures, the apparatus including a noszle structure incorporating a high pressure fluid feed in operative combination with an inlet for abrasive arranged such that the fluid flow draws in and entrains the abrasive, the noszle structure having an outlet surrounded by a coaxially positioned annular nozzle assembly supplied with compressed gas. In a preferred embodiment the abrasive is sand fed to the nozzle structure from a container which is subject to compressed gas such as air, or in an alternative arrangement the sand is fed from a hopper which includes a compressed air feed serving to agitate or fluidise the sand. Preferably the compressed air feed is effected through a pipe with a plurality of apertures along its length, the pipe extending through the hopper and the feed pipe thereby serving to fluidise the sand and improve the flow.
The invention is further described and illustrated by reference to the accompanying drawings showing embodiments by way of example only. In the drawings:
Figure la shows diagrammatically an arrangement for the nozzle,
Figure 1b shows a first modification, Figure 1c shows a second modification, Figure 2a shows one method of feeding sand to the nozzle utilising a hopper, Figure 2b shows an alternative method of feeding sand and water to the nozzle, Figure 3 shows a further method of feeding sand to a nozsle using a compressed air source feeding a container, Figure 4 shows a more detailed construction of nozzle assembly, and Figure 5 shows an alternative construction of nozzle. Referring firstly to Figure la of the drawings, the object of the apparatus according to the invention is to provide a high velocity jet of fluid such as water with entrained abrasive, sand as example, suitable for blasting metal or the like surfaces to clean same. To achieve this a nozzle 1 is provided which incorporates a high pressure water feed 2 with an orifice 3 of small size which feeds a nozzle chamber 4. Dry sand is fed through an inlet 5 and this sand is entrained by the water issuing into the chamber 4 to thereby produce a high velocity water and sand jet 6. In order to improve the characteristics of the jet 6 so as to provide a very high velocity water, sand and air jet, a coaxially positioned annular nozzle assembly 7 is provided which is fed with high pressure air 8. The air supply 8 thus surrounds the water and sand issuing from jet 6 and serves to accelerate both the water and the sand with a resultant improved cleaning effect on the structure. In addition, the arrangement provides for a much increased area of coverage through use of the composite jet, and sand is used more economically. Figure 1b shows an advantageous modification wherein the high velocity water and sand jet issues from the nozzle 1 at 6a with a small angle of divergence. Figure 1c shows a further modification where small transversely acting air jets 6b are arranged to impinge on the jet 6. In both these arrangements the acceleration of the centre jet of water and sand is improved due to the interference with the air jet 8.
In order to feed dry sand into the nozzle at 5 two arrangements are described according to further features of this invention. In Figure 2a the feed pipe 20 which serves to couple with the sand inlet 5 of Figures la, 1b, 1c is fed with sand from a hopper 21. A compressed air feed pipe 22 extends through the centre of the hopper and coaxially along the pipe 20. This pipe 22 is provided with spaced apertures 23a along its length and is fed with compressed air which serves to agitate the sand, thus improving the flow characteristics. Further compressed air feed points are provided at 23 which agitate sand within the hopper.
In Figure 3 a further alternative arrangement is provided whereby the feed pipe 30 for sand which connects with the inlet 5 of Figure 1 is supplied from a pressure pot 31 containing sand which is fed with compressed air through an inlet 32. This arrangement causes the sand to be fed into the nozzle assembly under pressure thus improving the take-up. The feed pipe 30 includes a valve 33 followed in the flow direction by a compressed air inlet from pipe 34 to agitate the sand. A pipe 35 provides for pressure equalisation.
A preferred construction for the noszle assembly shown in Figure la is illustrated in Figure 4, and as shown the nozzle includes an inlet 40 for high pressure water and inlet 40a for sand which is fed from either the hopper of Figure 2a or the compressed air supply pot of Figure 3. The high pressure water issues through a small orifice 41 into a collecting or entrainment chamber 42 whereby sand from the inlet 40a is mixed therewith. The entrained sand and high pressure water passes through ceramic nozzle 43 and issues in the form of a high pressure jet 44 at the nozzle outlet. Located around the nozzle 43 is a coaxial annular noszle chamber 47 which is fed with compressed air through an inlet 45. The compressed air exhausts from an annular nozzle 46 which is positioned about the nozzle 43 and thus provides the improvement in the cleaning action of the water and sand jet.
The chamber 42 and nozzle 43 are mounted in a gas- tight manner within a housing 50 using a seal 51. The housing has an insert body 52 mounted at the forward end and secured by bolts 53. The insert body defines a coaxial air receiving chamber 54 feeding the nozzle chamber 47.
In the arrangement of Figure 4 the compressed air pressure used will be of the order of 120 lb/in2 and the water pressure applied is some 1000 lb/in2.
In Figure 2 the compressed air pressure used for agitation is about 20 lb/in2 an d the height of the hopper 21 above the nozzle is about 2 metres.
In Figure 3 the compressed air supply to the pot 31 will be up to 100 lb/in2.
Figure 5 shows an alternative nozzle assembly wherein like parts to those in Figure 4 have the same reference numerals. This embodiment however has a single feed 48 for a sand water pre-mixture. Operation is otherwise similar. The premixed sand and water may be supplied by an arrangement as shown in Figure 2b, as example, wherein sand 205 is contained in a hopper 210 also containing water up to level 240. The sand and water are agitated by compressed air feed in through nozzles 230 and along an aperture pipe 220. The sand/water mixture is drawn out through pipe using a pump or air operated ejector device (not shown) and fed to inlet 48 of the nozzle shown in Figure 5.
In the constructions shown in Figures 4 and 5 modified versions (not shown) include the arrangements previously described in conjunction with Figures lb and 1c, wherein the water/sand nozzle 43 is modified to give a diverging component to the flow or the compressed air exhaust 46 is adapted to give an inwardly directed jet or component of flow.
In the nozzle of Figure 4, the high pressure water supply is passed through a small orifice prior to mixing with the abrasive and this causes a fall in pressure and hence a degree of suction for ingesting the abrasive into the nozzle. In the modified form of Figure 5 there is no need for high pressure water and the abrasive is contained in the water as a slurry which is then blasted on to the work piece as before.

Claims

1. A method of cleaning structures which comprises directing a jet of fluid with entrained abrasive at the structure, characterised in that the said jet is surrounded by a high velocity gas jet.
2. A method in accordance with Claim 1, wherein the fluid comprises water.
3. A method in accordance with Claim 1 or 2 , wherein the abrasive is sand.
4. A method in accordance with Claim 1, 2 or 3 wherein the gas is air.
5. A method in accordance with any preceding claim, wherein the fluid and abrasive are directed towards the structure through a nozzle, said nozzle outlet being coaxially surrounded by a further nozzle through which the high velocity jet of gas is directed.
6. A method in accordance with any preceding claim, wherein the abrasive and the fluid are fed to the nozzle through separate feed paths.
7. A method in accordance with Claim 6, wherein the fluid is fed through an orifice to an entrainment chamber having an inlet for abrasive, the entrainment chamber feeding the nozzle.
8. A method in accordance with Claim 6 or 7 , wherein the abrasive is fluidised and conveyed along the feed path using a gaseous medium such as air.
9. A method in accordance with any preceding Claim 1 to 5, wherein the abrasive and fluid are premixed and fed to the nozzle through a common feed path.
10. A method in accordance with Claim 9 wherein the pre-mixture is effected by agitating the abrasive within the liquid using a gaseous medium.
11. A method in accordance with any preceding claim, wherein the high velocity gas jet includes a portion with a radially inwardly directed component of flow.
12. A method in accordance with any preceding claim, wherein the jet of fluid with entrained abrasive has an outwardly radially directed component of flow.
13. Apparatus for cleaning structures, comprising a first nozzle with an inlet for abrasive and a fluid under pressure, the nozzle outlet being surrounded by a second coaxial nozzle with an inlet for high pressure gas.
14. Apparatus in accordance with Claim 13, wherein an inlet for fluid comprises an orifice directed into an entrainment chamber, an inlet for abrasive being located adjacent said orifice whereby fluid issuing from said orifice produces induction and entrainment of the abrasive, the entrainment chamber communicating with the nozzle.
15. Apparatus in accordance with Claim 13, wherein a common inlet is provided for premixed abrasive and fluid, the inlet feeding a receiving chamber and communicating with the nozzle.
16. Apparatus in accordance with Claim 13 or 14, wherein dry abrasive is fed to the inlet from a container, the container having gas inlets to effect fluidisation of the abrasive, a feed duct from the container conveying the fluidised abrasive to the inlet.
17. Apparatus in accordance with Claim 16, wherein the container comprises a closed container fed with gas under pressure, an outlet from the container having a control valve and a gas feed serving to convey the abrasive along a feed duct to the inlet.
18. Apparatus in accordance with Claim 15, wherein .a container is provided for abrasive and fluid, the container having inlets for agitating gas and an outlet connected with pump means serving to convey mixed abrasive and fluid to the inlet.
19. Apparatus in accordance with any preceding Claim 13 to 18, wherein the inlet for gas communicates with a chamber coaxially positioned about the first nozzle, said chamber communicating with a forwardly extending second nozzle having an outlet orifice defined by an end portion of the first nozzle.
20. Apparatus in accordance with Claim 19, wherein the first nozzle defines an inner wall of the second nozzle, an insert member defining an outer wall of the second nozsle.
21. An apparatus in accordance with any preceding claim 13 to 20, wherein the high pressure gas feeds a further nozzle or nozzles directed inwardly towards the first nozzle axis.
22. An apparatus in accordance with any preceding claim 13 to 21, wherein the first nozzle has an outlet or outlets producing a diverging flow.
23. Nozzle apparatus for cleaning structures as described herein and exemplified with reference to Figures 1a or 1b or 1C or Figure 4 or Figure 5 of the drawings.
24. Apparatus in accordance with Claim 23, further including feed means as described in Figure 2a or 2b or 3 of the drawings.
25. A method of cleaning structures as described herein and exemplified with particular reference to the drawings.
PCT/GB1987/000856 1986-12-03 1987-11-30 Method and apparatus for wet abrasive blasting Ceased WO1988004220A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB868628930A GB8628930D0 (en) 1986-12-03 1986-12-03 Sand blasting
GB8628930 1986-12-03

Publications (1)

Publication Number Publication Date
WO1988004220A1 true WO1988004220A1 (en) 1988-06-16

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ID=10608398

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1987/000856 Ceased WO1988004220A1 (en) 1986-12-03 1987-11-30 Method and apparatus for wet abrasive blasting

Country Status (3)

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AU (1) AU8324787A (en)
GB (2) GB8628930D0 (en)
WO (1) WO1988004220A1 (en)

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WO1990008083A1 (en) * 1989-01-11 1990-07-26 Abb Stal Ab Ejector with peripheral supply of propellent gas
WO1992002349A3 (en) * 1990-08-04 1992-03-19 Robert Sidney Jackson The removal of material from surfaces
EP0672502A1 (en) * 1994-03-11 1995-09-20 Guyson International Ltd Apparatus for the application of blast media onto articles
WO1997006923A1 (en) * 1995-08-11 1997-02-27 Crycle Cryogenic C.V. Method and apparatus for cutting, abrading, and drilling with sublimable particles and vaporous liquids
GB2359037A (en) * 2000-02-08 2001-08-15 Circle Technical Services Ltd Cutting apparatus and method
WO2012112056A1 (en) * 2011-02-14 2012-08-23 Neodrill As Device for underwater surface treatment with an abrasive agent
EP2801443A1 (en) * 2013-05-07 2014-11-12 Phibo Industries BVBA Processing medium for processing stainless steel or other metallic surfaces, method for processing stainless steel or other metallic surfaces using such a processing medium and nozzle arranged to be fitted on a process gun
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US9108297B2 (en) 2010-06-21 2015-08-18 Omax Corporation Systems for abrasive jet piercing and associated methods
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US9283656B2 (en) 2011-04-01 2016-03-15 Omax Corporation Systems and methods for fluidizing an abrasive material
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US9586306B2 (en) 2012-08-13 2017-03-07 Omax Corporation Method and apparatus for monitoring particle laden pneumatic abrasive flow in an abrasive fluid jet cutting system
US8904912B2 (en) 2012-08-16 2014-12-09 Omax Corporation Control valves for waterjet systems and related devices, systems, and methods
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US9050704B1 (en) 2013-03-15 2015-06-09 Omax Corporation Abrasive-delivery apparatuses for use with abrasive materials in abrasive-jet systems and related apparatuses, systems, and methods
US11577366B2 (en) 2016-12-12 2023-02-14 Omax Corporation Recirculation of wet abrasive material in abrasive waterjet systems and related technology
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WO2021127253A1 (en) 2019-12-18 2021-06-24 Hypertherm, Inc. Liquid jet cutting head sensor systems and methods
WO2021195106A1 (en) 2020-03-24 2021-09-30 Hypertherm, Inc. High-pressure seal for a liquid jet cutting system
WO2021202390A1 (en) 2020-03-30 2021-10-07 Hypertherm, Inc. Cylinder for a liquid jet pump with multi-functional interfacing longitudinal ends
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US2369576A (en) * 1943-12-20 1945-02-13 Pangborn Corp Blast gun
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US2658312A (en) * 1951-01-26 1953-11-10 Leslie W Smith Spray gun nozzle for spraying buffing compounds
US2797530A (en) * 1954-08-17 1957-07-02 Pangborn Corp Sluriator
DE2253633A1 (en) * 1971-11-12 1973-05-17 Atlas Copco Ab DEVICE FOR SPRAYING POWDER
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GB8727944D0 (en) 1988-01-06
AU8324787A (en) 1988-06-30
GB2198975A (en) 1988-06-29
GB8628930D0 (en) 1987-01-07

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