EP0539581B1 - Unversehrtheitsfühler für strahldüsen - Google Patents

Unversehrtheitsfühler für strahldüsen Download PDF

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Publication number
EP0539581B1
EP0539581B1 EP92915282A EP92915282A EP0539581B1 EP 0539581 B1 EP0539581 B1 EP 0539581B1 EP 92915282 A EP92915282 A EP 92915282A EP 92915282 A EP92915282 A EP 92915282A EP 0539581 B1 EP0539581 B1 EP 0539581B1
Authority
EP
European Patent Office
Prior art keywords
fluid
fluid jet
nozzle
sensor
chamber
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.)
Expired - Lifetime
Application number
EP92915282A
Other languages
English (en)
French (fr)
Other versions
EP0539581A1 (de
Inventor
Wei-Long Chen
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.)
Ingersoll Rand Co
Original Assignee
Ingersoll Rand Co
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 Ingersoll Rand Co filed Critical Ingersoll Rand Co
Publication of EP0539581A1 publication Critical patent/EP0539581A1/de
Application granted granted Critical
Publication of EP0539581B1 publication Critical patent/EP0539581B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
    • B26F3/00—Severing by means other than cutting; Apparatus therefor
    • B26F3/004—Severing by means other than cutting; Apparatus therefor by means of a fluid jet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/08—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means
    • B05B12/085—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means responsive to flow or pressure of liquid or other fluent material to be discharged
    • 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
    • B24C7/0069—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 with means for preventing clogging of the equipment or for preventing abrasive entering the airway

Definitions

  • This invention relates generally to fluid jet nozzles and more particularly to a flow sensor located in a chamber downstream of the orifice to sense the flow characteristics of the fluid jet and the condition of the nozzle orifice.
  • Abrasive fluid jet cutters and cleaners are especially difficult to monitor since the flow characteristics of the fluid jet downstream of the funnel tube can be affected not only by the condition of the orifice and specifics of the fluid jet adjacent the orifice, but also by the configuration and dimensions of the chamber and funnel tube and the type and amount of abrasives being used. Monitoring whether the fluid jet is within permissible limits and causes of the flow abnormalities in the fluid jet is therefore difficult.
  • EP-A-1 599 977 discloses a nozzle assembly apparatus which includes a fluid source supplying a nozzle orifice with a fluid jet discharging through the orifice into a chamber, there being sensor means for sensing the fluid condition in the chamber.
  • an apparatus comprising: a nozzle assembly having a nozzle orifice formed therein; a highly pressurised fluid source in fluid communication with said nozzle orifice, wherein a fluid jet is discharged through the nozzle orifice into a chamber downstream of said nozzle assembly; a sensor means in fluid communication with the chamber, for sensing a fluid condition in said chamber which provides an indication of quality of the nozzle orifice, the fluid jet or combination thereof; characterised by alignment means for aligning the orientation of the fluid jet relative to the workpiece based upon said indication of the quality of the fluid jet.
  • Figure 1 illustrates a fluid jet nozzle apparatus 10.
  • the fluid jet nozzle apparatus 10 includes a nozzle assembly 12, a nozzle tube 14 and a nozzle nut 16.
  • the nozzle assembly 12 has a nozzle orifice 18 formed therein as is well known in the art.
  • the nozzle tube 14 is in fluid communication with the nozzle orifice 18, wherein a fluid jet 20 is produced downstream of the nozzle assembly 12 into a chamber 22.
  • a sensor 24 is in fluid communication with the chamber 22.
  • Either a flow meter or a pressure sensor may be used as a sensor 24 in the present application. Both types of sensors provide reliable indication of the condition of the fluid jet 20. It may be desired to provide both a pressure sensor 27 and a flow meter. As illustrated in Fig. 2, in situations where the sensor is monitored by a computer, an acceptable value for the pressure indicated by the pressure sensor 27 can be within a preset range for a specified range indicated by the flow meter 25, or vice versa.
  • Sensors of this type may be applied to either non-abrasive fluid jet cutting applications, as illustrated in Fig. 1, or to abrasive fluid jet cutting applications as illustrated in Fig. 2.
  • an abrasive inlet means 26 is in fluid communication with the chamber 22.
  • a funnel tube 28 is located downstream of the chamber 22, and is coaxial with the fluid jet 20.
  • One or more control valves 30 may be applied to control the fluid flow from abrasive inlet means 26 or sensor 25, 27. Using the control valves 30, the sensor 24 and the abrasive inlet means 26 may be applied as desired.
  • abrasive fluid jet cutting applications there exists an optimum abrasive feeding rate which depends upon the operational parameters of the fluid jet cutter (the relevant parameters include the size of the nozzle orifice 18, the size of the funnel tube 28, the fluid pressure and the type and size of abrasives added to the fluid.
  • the present invention provides the operator with a reliable and quantitative indication of whether the funnel tube 28 meets acceptable standards.
  • the operator has to continually observe the fluid jet stream and using non-quantitative standards and determine when the nozzle fell below the desired standards.
  • the prior art requires a skilled operator to function properly.
  • Yet another application in abrasive fluid jet cutting is the detection of the clogging of the funnel tube 28 during the cutting process by injected garnet particles of large dimensions. This clogging quickly becomes apparent by the sensor 24 indications.
  • the sensor 24 may range in complexity from a visual sensor which has to be observed by the operator to one which sends signals to a microprocessor (not shown but well known in the art).
  • the microprocessor can be used to stop application of fluid to the nozzle tube 14 when the quality of the fluid stream (as sensed by 24, 25 or 27) goes below a preset limit.
  • the information from the microprocessor is input into an alignment means 33. This assumes that when the quality of the fluid jet decreases, the stream will become wider, and the cutting kerf 34 (width of a workpiece 36 which is cut by the fluid jet 20) will widen.
  • the adjustment means can reposition the orientation of the fluid jet nozzle apparatus 10 relative to the workpiece to compensate for the increase in dimension of the fluid jet. It is to be understood that the adjustment means can reposition either the fluid jet nozzle apparatus 10 (see Fig. 3) or the workpiece 36 (see Fig. 4).

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)

Claims (5)

  1. Vorrichtung mit einer Düsenanordnung (12) mit einer darin geformten Düsenöffnung (18), mit einer unter hohem Druck stehenden Fluidquelle, die in Fluidverbindung mit der Düsenöffnung steht, wobei ein Fluidstrom (20) durch die Düsenöffnung in eine stromabwärts von der Düsenanordnung gelegene Kammer (22) entladen wird, mit einer mit der Kammer in Fluidverbindung stehenden Fühlereinrichtung (24) zum Erfühlen eines Fluidzustandes in der Kammer, was einen Hinweis auf die Qualität der Düsenöffnung (18), des Fluidstroms (20) oder einer Kombination daraus ergibt, gekennzeichnet durch eine Ausrichtungseinheit (33) zum Ausrichten der Orientierung des Fluidstromes relativ zu dem Werkstück (36) auf der Basis des Hinweises auf die Qualität des Fluidstroms.
  2. Vorrichtung nach Anspruch 1, wobei die Fühlereinrichtung ein Fluiddrucksensor (27) ist.
  3. Vorrichtung nach Anspruch 1, wobei die Fühlereinrichtung ein Fluidströmungsmeßgerät (25) ist.
  4. Vorrichtung nach Anspruch 1, wobei die Fühlereinrichtung ein Fluiddrucksensor (27) und ein Fluidströmungsmeßgerät (25) ist.
  5. Vorrichtung nach einem der vorhergehenden Ansprüche, mit einer mit der Kammer in Fluidverbindung stehenden Verschleißmitteleinlaßeinrichtung (26), wobei die Fühlereinrichtung mit der Verschleißmitteleinlaßeinrichtung in Fluidverbindung steht.
EP92915282A 1991-05-17 1992-05-15 Unversehrtheitsfühler für strahldüsen Expired - Lifetime EP0539581B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US70199791A 1991-05-17 1991-05-17
US701997 1991-05-17
PCT/US1992/004143 WO1992020456A1 (en) 1991-05-17 1992-05-15 Integrity sensor for fluid jet nozzle

Publications (2)

Publication Number Publication Date
EP0539581A1 EP0539581A1 (de) 1993-05-05
EP0539581B1 true EP0539581B1 (de) 1996-03-27

Family

ID=24819482

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92915282A Expired - Lifetime EP0539581B1 (de) 1991-05-17 1992-05-15 Unversehrtheitsfühler für strahldüsen

Country Status (5)

Country Link
EP (1) EP0539581B1 (de)
JP (1) JPH06503761A (de)
DE (1) DE69209436T2 (de)
ES (1) ES2085629T3 (de)
WO (1) WO1992020456A1 (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5637027A (en) * 1993-12-23 1997-06-10 Hughes Aircraft Company CO2 jet spray system employing a thermal CO2 snow plume sensor
WO2004076075A1 (en) * 2003-02-27 2004-09-10 Nordson Corporation Flow detection in liquid application systems
CA3062081A1 (en) 2017-06-23 2018-12-27 Flow International Corporation Autonomous modification of waterjet cutting systems
BE1025457B1 (nl) * 2017-08-08 2019-03-11 D.E.C.O. Nv Waterstraalinrichting en methode voor het detecteren van een insnijding
LU101065B1 (en) 2018-12-21 2020-06-24 Univ Luxembourg Machining system and monitoring method

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2520566A (en) * 1947-02-19 1950-08-29 Sargrove Electronics Ltd Grit blasting apparatus and the like
US4420957A (en) * 1981-10-26 1983-12-20 Progressive Blasting Systems, Inc. Monitor method and apparatus for particle blasting equipment
AT380422B (de) * 1984-04-25 1986-05-26 Ver Edelstahlwerke Ag Fluessigkeitsstrahlschneideinrichtung

Also Published As

Publication number Publication date
EP0539581A1 (de) 1993-05-05
ES2085629T3 (es) 1996-06-01
DE69209436D1 (de) 1996-05-02
WO1992020456A1 (en) 1992-11-26
DE69209436T2 (de) 1996-08-14
JPH06503761A (ja) 1994-04-28

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