EP3572186A1 - Têtes abrasives comportant une alimentation en gaz propre - Google Patents

Têtes abrasives comportant une alimentation en gaz propre Download PDF

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Publication number
EP3572186A1
EP3572186A1 EP19174330.1A EP19174330A EP3572186A1 EP 3572186 A1 EP3572186 A1 EP 3572186A1 EP 19174330 A EP19174330 A EP 19174330A EP 3572186 A1 EP3572186 A1 EP 3572186A1
Authority
EP
European Patent Office
Prior art keywords
abrasive
infeed
gas
jet
clean gas
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.)
Pending
Application number
EP19174330.1A
Other languages
German (de)
English (en)
Inventor
Jiri Mestanek
Zdenek RÍHA
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.)
Ustav Geoniky Av Cr VVI
PTV sro
Original Assignee
Ustav Geoniky Av Cr VVI
PTV sro
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 Ustav Geoniky Av Cr VVI, PTV sro filed Critical Ustav Geoniky Av Cr VVI
Publication of EP3572186A1 publication Critical patent/EP3572186A1/fr
Pending 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
    • B24C5/04—Nozzles therefor

Definitions

  • the technical solution falls within the hydraulics area.
  • the patent subject-matter is a tool to clean/remove material surfaces and split/clean materials with a liquid beam enriched with solid abrasive particles.
  • an abrasive head is used as a tool with predominantly automatic gas and abrasive intake to split and cut various materials.
  • the tool consists of three main components: liquid jet, mixing chamber and abrasive jet.
  • the above-mentioned components are positioned in line along the tool axis in a way that the high-speed liquid beam formed by a liquid jet passes all along the tool axis.
  • Water may be used as the liquid here.
  • Air may be used as the gas.
  • the liquid jet is designed to convert pressure energy into kinetic energy, thus creating a high-speed liquid beam.
  • the thin liquid beam passes through the center of the tool or other abrasive head's main parts. The beam movement in the mixing chamber center may result in automatic gas and abrasive intake into the mixing chamber.
  • the gas and abrasive particles are accelerated here by the high-speed liquid beam motion.
  • the created mixture of liquid, gas and abrasive particles flows on to pass through the abrasive jet center. Further acceleration of the gas and abrasive particles is made by the action of the high-speed liquid beam flowing in housing interior of the abrasive jet, which is largely formed by an input cone linked with the upstream mixing chamber shape and a long cylindrical opening.
  • Document US 2017326706 may appear to be the closest technological state. It describes the jet head dealing with the gas infeeds to stabilize the water beam.
  • the gas infeeds are implemented both upstream and downstream the mixing chamber.
  • the gas infeeds are implemented by several components arranged and inserted in the jet head, while the gas is supplied upstream, i.e. under an angle of more than 90° to the common axis into the point with the highest liquid beam velocity, directly under the liquid jet where huge energy losses of the liquid beam occur.
  • the liquid beam loses its velocity and the vortex flow may even unbalance the liquid beam.
  • the solution according to document US 2017326706 is nearly unusable in practice.
  • a new abrasive head with clean gas infeed to split/cut materials by a liquid beam enriched with solid abrasive particles was developed. This head significantly extends the tool lifetime by eliminating damage to the liquid jet's aperture by abrasive as well as eliminating degradation of abrasive inside the tool.
  • the abrasive head fully prevents the gas and abrasive mixture backflow upstream towards the water jet, making the abrasive particles move downstream outside the tool, thus eliminating damage to the water jest and degradation of the abrasive itself.
  • the backflow avoidance is designed in a manner that the abrasive head contains a clean gas infeed in the liquid beam infeed channel.
  • the clean gas infeed makes the gas intake into the abrasive head, thus eliminating unwanted air recirculation along with the particles of the abrasive itself that harm the tool's internal walls and mainly the liquid jet's walls.
  • the recirculation is shown on Fig.1 and 2 , with Fig.1 describing gas and abrasive upstream recirculation up to the liquid jet in case when no clean gas infeed is installed, while Fig. 2 shows clean gas flow through the channel downstream the liquid beam flow which eliminates backward recirculation of gas and abrasive by filling the entire channel.
  • clean gas supply into the infeed channels is made separately before the abrasive infeed.
  • the tool From the pressurized water infeed up to the abrasive jet, i.e. downstream, the tool consists of the liquid jet connected to the infeed channel equipped with the clean gas intake.
  • the liquid jet leads into the mixing chamber connected to the abrasive jet.
  • the clean gas infeed has the benefit of being inclined to the common axis by 10 to 90°.
  • At least one gas and abrasive mixture infeed leads into the mixing chamber, the gas and abrasive mixture has the advantage of being fed into the mixing chamber through several symmetrically positioned infeeds.
  • the gas and abrasive mixture infeed has the benefit of being inclined to the common axis by 10 to 90°.
  • the infeeds of gas and abrasive mixture have the benefit of being connected to the gas and abrasive mixture distributor.
  • the liquid jet, infeed channel, mixing chamber and abrasive jet are positioned in the tool's axis downstream the pressurized water infeed.
  • the infeed channel's inner cross-section is smaller than the abrasive jet cylindrical part's inner cross-section, which guarantees automatic gas and abrasive mixture intake into the abrasive jet.
  • the clean gas intake can extend the lifetime of an existing tool.
  • the clean gas infeed can be implemented in an existing tool in a fairly easy way such as with electro-erosive machining.
  • damage to the liquid jet by abrasive particles is fully avoided, still without any decrease in both the abrasive head's cutting power as well as energy.
  • the tool design should be selected with respect to the tool load level.
  • Stressed tool components, bearing housings and jets may be made of hard metal or high-strength abrasive-resistant steel (such as 17-4PH, 17022, 1.4057 or 17346 steel etc.) and it's recommended to select high-strength materials such as diamond or sapphire for the liquid jets.
  • high-strength materials such as diamond or sapphire for the liquid jets.
  • the pressurized water connection is located on the top part of the supporting housing.
  • the liquid jet body, the common channel housing, the inserted jet body and the mixing chamber housing are placed inside the inner body while the housings and other components may be connected using threaded joint, press connection or other permanent or demountable means. More housings and/or components can be made of a single piece.
  • the abrasive jet housing is placed at the bottom of the supporting housing. As a benefit, the abrasive jet housing can be fixed in the supporting housing with a threaded joint or can be attached to the supporting housing via a collet with a nut.
  • the mixing chamber can be a direct part of the bearing housing.
  • Fig.3 shows a tool design with clean gas intake 96 through the infeed 26 leading into the infeed channel 25 downstream the water jet 21 located downstream the pressurized liquid infeed 73 .
  • the water jet 21 is connected to the infeed channel 25 into which the clean gas 96 infeed 26 leads.
  • the tool main components, i.e. water jet 21 , mixing chamber 22 and abrasive jet 23 are positioned in the tool axis 55 , while the liquid jet 21 axis 56 is identical with the infeed channel axis 25 and the tool axis 55 .
  • the infeed channel 25 leads into the mixing chamber 22 together with one infeed 28 of the gas and abrasive mixture 94 .
  • the infeed channel inner cross-section 25 is smaller than the abrasive jet 23 cylindrical part's 75 inner cross-section. This results in the gas and abrasive mixture 94 being intaken the mixing chamber 22 through the infeed 28 of the gas and abrasive mixture 94 automatically, just like the clean gas 96 is automatically intaken through the clean gas 26 infeed 96 .
  • the gas and abrasive mixture 94 accelerated by the common high-speed liquid beam 95 enters the abrasive jet 23 connected to the mixing chamber 22 .
  • the abrasive jet 23 is positioned in the tool axis 55 at the tool's end. At this point, further acceleration of the described mixture occurs before impacting on the cut material.
  • the abrasive head bearing housing contains infeed channel 25 downstream the water jet 21 , clean gas 96 infeed 26 and the infeed 28 of the gas and abrasive mixture 94 . It's made of 17-4PH steel.
  • the mixing chamber housing 22 is made of hard metal.
  • the abrasive jet's housing 23 is made of hard metal. Clean gas 96 infeed 26 made of 17022 steel is connected to the abrasive head's bearing housing. Gas and abrasive mixture 94 infeed 28 made of 17022 steel is connected to the abrasive head's bearing housing.
  • An abrasive head with inclined clean gas infeed into the infeed channel.
  • Fig 4 shows a tool design example with clean gas intake 96 through the infeed 26 leading into the common channel 25 under an angle of 55° to the tool axis 55 downstream after the water jet 21 installed after the pressurized liquid infeed 73 .
  • the water jet 21 is connected to the infeed channel 25 into which the clean gas 96 infeed 26 leads.
  • the tool main components, i.e. water jet 21 , mixing chamber 22 and abrasive jet 23 are positioned in the tool axis 55 , while the liquid jet 21 axis 56 is identical with the infeed channel axis 25 and the tool axis 55 .
  • the infeed channel 25 leads into the mixing chamber 22 together with one infeed 28 of the gas and abrasive mixture 94 .
  • the infeed channel inner cross-section 25 is greater than the abrasive jet 23 cylindrical part's 75 inner cross-section. This results in the gas and abrasive mixture 94 being intaken the mixing chamber 22 through the infeed 28 of the gas and abrasive mixture 94 by overpressure, with the clean gas 96 being automatically intaken through the clean gas 96 infeed 26 .
  • the gas and abrasive mixture 94 accelerated by the common high-speed liquid beam 95 enters the abrasive jet 23 connected to the mixing chamber 22 .
  • the abrasive jet 23 is positioned in the tool axis 55 at the tool's end. At this point, further acceleration of the described mixture occurs before impacting on the cut material.
  • the abrasive head bearing housing contains infeed channel 25 downstream the water jet 21 , mixing chamber 22 and the infeed 28 of the gas and abrasive mixture 94 . It's made of 1.4057 abrasion-resistant steel.
  • the abrasive jet's housing 23 is made of hard metal. Clean gas 96 infeed 26 made of 17346 steel is connected to the abrasive head's bearing housing.
  • the gas and abrasive mixture 94 infeed 28 made of 17346 steel is connected to the abrasive head's bearing housing.
  • An abrasive head with inclined gas and abrasive mixture infeed and inclined clean gas infeed An abrasive head with inclined gas and abrasive mixture infeed and inclined clean gas infeed.
  • Fig.5 shows a tool design example with clean gas intake 96 through the infeed 26 leading into the infeed channel 25 downstream the water jet 21 located downstream the pressurized liquid infeed 73 .
  • the water jet 21 is connected to the infeed channel 25 into which the clean gas 96 infeed 26 leads, inclined to the tool axis 55 by 60° downstream.
  • the tool main components, i.e. water jet 21 , mixing chamber 22 and abrasive jet 23 are positioned in the tool axis 55 , while the liquid jet 21 axis 56 is identical with the infeed channel axis 25 and the tool axis 55 .
  • the infeed channel 25 leads into the mixing chamber 22 together with one infeed 28 of the gas and abrasive mixture 94 inclined to the tool axis 55 by 50° downstream.
  • the infeed channel inner cross-section 25 is smaller than the abrasive jet 23 cylindrical part's 75 inner cross-section. This results in the gas and abrasive mixture 94 being intaken into the shaped mixing chamber 22 through the infeed 28 of the gas and abrasive mixture 94 automatically, just like the clean gas 96 is automatically intaken through the clean gas 26 infeed 96 .
  • the gas and abrasive mixture 94 accelerated by the common high-speed liquid beam 95 enters the abrasive jet 23 connected to the mixing chamber 22 .
  • the abrasive jet 23 is positioned in the tool axis 55 at the tool's end. At this point, further acceleration of the described mixture occurs before impacting on the cut material.
  • the abrasive head bearing housing contains infeed channel 25 downstream the water jet 21 , clean gas 96 infeed 26 and the infeed 28 of the gas and abrasive mixture 94 . It's made of 17022 steel.
  • the mixing chamber housing 22 is made of hard metal.
  • the abrasive jet's housing 23 is made of hard metal.
  • the liquid jet 21 is made of sapphire and the infeed channels 25 are made of PVC. Clean gas 96 infeed 26 made of 17022 steel is connected to the abrasive head's bearing housing.
  • Gas and abrasive mixture 94 infeed 28 made of 17-4PH steel is connected to the abrasive head's bearing housing.
  • Fig.6 shows a tool design example with clean gas intake 96 through the infeed 26 leading into the infeed channel 25 downstream the water jet 21 located downstream the pressurized liquid infeed 73 .
  • the water jet 21 is connected to the infeed channel 25 into which two clean gas 96 infeeds 26 leads, inclined to the tool axis 55 by 60° downstream.
  • the tool main components, i.e. water jet 21 , mixing chamber 22 and abrasive jet 23 are positioned in the tool axis 55 , while the liquid jet 21 axis 56 is identical with the infeed channel axis 25 and the tool axis 55 .
  • the infeed channel 25 leads into the mixing chamber 22 together with two infeeds 28 of the gas and abrasive mixture 94 inclined to the tool axis 55 by 55° downstream.
  • the gas and abrasive 94 mixture infeeds 28 are connected to the distributor of the gas and abrasive mixture 94 .
  • the infeed channel inner cross-section 25 is smaller than the abrasive jet 23 cylindrical part's 75 inner cross-section. This results in the gas and abrasive mixture 94 being intaken into the shaped mixing chamber 22 through the infeeds 28 of the gas and abrasive mixture 94 automatically, just like the clean gas 96 is automatically intaken through the clean gas 26 infeed 96 .
  • the abrasive jet 23 is positioned in the tool axis 55 at the tool's end. At this point, further acceleration of the described mixture occurs before impacting on the cut material.
  • the abrasive head bearing housing contains infeed channel 25 downstream the water jet 21 , clean gas 96 infeed 26 and the infeed 28 of the gas and abrasive mixture 94 . It's made of 17022 steel.
  • the mixing chamber housing 22 is made of hard metal.
  • the abrasive jet's housing 23 is made of hard metal.
  • the liquid jet 21 is made of sapphire and the infeed channels 25 are made of PVC. Clean gas 96 infeed 26 made of 17022 steel is connected to the abrasive head's bearing housing.
  • Gas and abrasive mixture 94 infeed 28 made of 17-4PH steel is connected to the abrasive head's bearing housing.
EP19174330.1A 2018-05-22 2019-05-14 Têtes abrasives comportant une alimentation en gaz propre Pending EP3572186A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CZ2018000235 2018-05-22

Publications (1)

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EP3572186A1 true EP3572186A1 (fr) 2019-11-27

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EP19174330.1A Pending EP3572186A1 (fr) 2018-05-22 2019-05-14 Têtes abrasives comportant une alimentation en gaz propre

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Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB774624A (en) 1955-05-10 1957-05-15 John Alexander Johnson Improvements in or relating to devices for producing jets of sand or like granular or powder material
JPS6228173B2 (fr) 1981-07-23 1987-06-18 Sumitomo Chemical Co
US4995202A (en) 1990-04-26 1991-02-26 The Dow Chemical Company Nozzle unit and method for using wet abrasives to clean hard surfaces
WO1992019384A1 (fr) * 1991-04-24 1992-11-12 Ingersoll-Rand Company Limiteur de contre-courant pour un ajutage a jet de fluide
EP0873220A1 (fr) 1996-10-04 1998-10-28 SÄCHSISCHE WERKZEUG UND SONDERMASCHINEN GmbH Tete de coupe modulaire a agent abrasif et a jet d'eau
US20050017091A1 (en) * 2003-07-22 2005-01-27 Omax Corporation Abrasive water-jet cutting nozzle having a vented water-jet pathway
EP2321093B1 (fr) * 2008-06-23 2013-01-02 Flow International Corporation Corps de tête de découpe à évents pour système à jet abrasif
EP2853349A1 (fr) 2013-09-27 2015-04-01 Water Jet Sweden AB Buse de coupe à jet d'eau abrasif
WO2016071866A1 (fr) * 2014-11-05 2016-05-12 Institute Of Geonics As Cr, V. V. I. Dispositif de découpe à jet de fluide abrasif à vitesse élevée
US20160129551A1 (en) 2014-11-07 2016-05-12 Sugino Machine Limited Abrasive nozzle head
EP3094448A1 (fr) 2014-01-15 2016-11-23 Flow International Corporation Systèmes de tête de découpe au jet d'eau haute pression, composants et procédés associes
US20170326706A1 (en) 2016-05-11 2017-11-16 Sugino Machine Limited Nozzle device
EP3539721A1 (fr) * 2018-03-13 2019-09-18 PTV, spol. s.r.o. Tête abrasive à jets multiples

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB774624A (en) 1955-05-10 1957-05-15 John Alexander Johnson Improvements in or relating to devices for producing jets of sand or like granular or powder material
JPS6228173B2 (fr) 1981-07-23 1987-06-18 Sumitomo Chemical Co
US4995202A (en) 1990-04-26 1991-02-26 The Dow Chemical Company Nozzle unit and method for using wet abrasives to clean hard surfaces
WO1992019384A1 (fr) * 1991-04-24 1992-11-12 Ingersoll-Rand Company Limiteur de contre-courant pour un ajutage a jet de fluide
EP0873220A1 (fr) 1996-10-04 1998-10-28 SÄCHSISCHE WERKZEUG UND SONDERMASCHINEN GmbH Tete de coupe modulaire a agent abrasif et a jet d'eau
US20050017091A1 (en) * 2003-07-22 2005-01-27 Omax Corporation Abrasive water-jet cutting nozzle having a vented water-jet pathway
EP2321093B1 (fr) * 2008-06-23 2013-01-02 Flow International Corporation Corps de tête de découpe à évents pour système à jet abrasif
EP2853349A1 (fr) 2013-09-27 2015-04-01 Water Jet Sweden AB Buse de coupe à jet d'eau abrasif
EP3094448A1 (fr) 2014-01-15 2016-11-23 Flow International Corporation Systèmes de tête de découpe au jet d'eau haute pression, composants et procédés associes
WO2016071866A1 (fr) * 2014-11-05 2016-05-12 Institute Of Geonics As Cr, V. V. I. Dispositif de découpe à jet de fluide abrasif à vitesse élevée
US20160129551A1 (en) 2014-11-07 2016-05-12 Sugino Machine Limited Abrasive nozzle head
US20170326706A1 (en) 2016-05-11 2017-11-16 Sugino Machine Limited Nozzle device
EP3539721A1 (fr) * 2018-03-13 2019-09-18 PTV, spol. s.r.o. Tête abrasive à jets multiples

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