EP2266701A1 - Electrode de travail pour une installation de fragmentation électrodynamique - Google Patents

Electrode de travail pour une installation de fragmentation électrodynamique Download PDF

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Publication number
EP2266701A1
EP2266701A1 EP10009321A EP10009321A EP2266701A1 EP 2266701 A1 EP2266701 A1 EP 2266701A1 EP 10009321 A EP10009321 A EP 10009321A EP 10009321 A EP10009321 A EP 10009321A EP 2266701 A1 EP2266701 A1 EP 2266701A1
Authority
EP
European Patent Office
Prior art keywords
expansion sleeve
expansion
working electrode
central conductor
working
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.)
Granted
Application number
EP10009321A
Other languages
German (de)
English (en)
Other versions
EP2266701B1 (fr
Inventor
Reinhard MÜLLER-SIEBERT
Daniel Emanuel Maurer
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.)
Selfrag AG
Original Assignee
Selfrag AG
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 Selfrag AG filed Critical Selfrag AG
Publication of EP2266701A1 publication Critical patent/EP2266701A1/fr
Application granted granted Critical
Publication of EP2266701B1 publication Critical patent/EP2266701B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C19/00—Other disintegrating devices or methods
    • B02C19/18—Use of auxiliary physical effects, e.g. ultrasonics, irradiation, for disintegrating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C19/00—Other disintegrating devices or methods
    • B02C19/18—Use of auxiliary physical effects, e.g. ultrasonics, irradiation, for disintegrating
    • B02C2019/183—Crushing by discharge of high electrical energy

Definitions

  • the invention relates to a working electrode for an electrodynamic fragmentation system, change parts for such a working electrode and a use of the working electrode according to the preambles of the independent claims.
  • high voltage breakdowns are produced by a working electrode applied to high voltage pulses and a base electrode, which is usually at a neutral potential, through the material to be comminuted, which leads to the comminution of the material.
  • a slight removal of material at the working electrode tip takes place at each high-voltage breakdown, so that it is worn after a certain period of use and must be replaced. It may also be necessary to change the electrode when changing the material to be digested with the equipment in order to prevent contamination of the end product with unwanted electrode material.
  • high-voltage electrodes are known from the prior art in which the electrode tip is formed by an exchangeable exchangeable part and which thereby largely avoid the aforementioned disadvantages.
  • Such high voltage electrodes are for example in SU 1790069 A1 . SU 1781892 A1 . JP 2003 001137 A . US 2005/0150668 A1 . DE 38 44 419 A1 and US 4,458,153 shown.
  • the electrode tip is either screwed to the central conductor of the high voltage electrode or in the case of DE 38 44 419 A1
  • these high-voltage electrodes have the disadvantage that it can come at high pressure pulsations in the working space to a dissolution of the electrode tip forming change part and in the case of the clamped electrode tip also a structurally relatively complex arrangement for fixing the Electrode tip is required.
  • a first aspect of the invention relates to a working electrode for an electrodynamic fragmentation system with a replaceable electrode tip.
  • the working electrode comprises an insulator body, for example made of plastic or of a ceramic material, with a central conductor of a highly electrically conductive, preferably metallic material, for example of aluminum, copper or stainless steel, which passes through the insulator axially.
  • a high voltage generator for charging the working electrode with high voltage pulses.
  • the central conductor At its other end, the so-called working end, which dips in operation in the filled with process fluid, eg water, and the material to be crushed workspace of the fragmentation, the central conductor carries an electrode tip, which forms the starting point for the voltage breakdown in operation.
  • the electrode tip is formed by a replaceable, one-piece or multi-part removable part.
  • the removable part is frictionally secured by clamping in an end opening in the working end of the central conductor, which is preferably accomplished by the replacement part comprises a preferably cylindrical expansion sleeve and an at least partially arranged in the expansion sleeve expansion means by which the expansion sleeve in such a spreadable area is that it is pressed radially against the wall of the frontal opening and thereby clamped axially immovable in the opening.
  • such working electrodes have the advantage that when a wear of the electrode or a change in the material to be crushed, only the electrode tip must be changed and, for example, an opening of an oil-filled high-voltage system for the purpose of replacing the entire working electrode is superfluous. It is thereby advantageous to significantly reduce the maintenance-related downtime and operating costs of electrodynamic fragmentation systems. It is advantageous if the expansion body is connected to a drive element for axially displacing it with respect to the expansion sleeve to effect a radial spreading of the expansion sleeve, which protrudes at the working end of the central conductor emerges from the frontal opening and at its end facing away from the spreader end forms the electrode tip.
  • the clamping of the removable part in the central conductor can be effected in a simple manner by exerting an axial force on the drive element. If, in addition, the expansion body and the drive element are formed integrally with one another, which is preferred, the result is a particularly simple and robust construction.
  • the expansion body has a preferably cone-shaped or pyramid-shaped section for radial spreading of the expansion sleeve or is formed overall as a cone or truncated pyramid, as this very large expansion forces can be generated in a controlled manner.
  • the drive element wipe the electrode tip and the spreader on an external thread, by means of which an axial force can be exerted on this to effect a displacement of the spreader and a resulting radial expansion and clamping of the expansion in the opening in the central conductor.
  • an axial force can be exerted on this to effect a displacement of the spreader and a resulting radial expansion and clamping of the expansion in the opening in the central conductor.
  • the expansion body is designed such that an axial displacement of the same towards the working end of the central conductor causes a radial spreading of the expansion sleeve, the drive element for clamping the change part in the central conductor so tensile forces must be transmitted, it is advantageous if the external thread the drive element for generating the axial displacement forces cooperates with a corresponding internal thread of an abutment element, which is supported axially on the expansion sleeve. This results in a simple construction with few components.
  • the abutment element is designed as a hexagon nut or as a face nut with at least two end holes, which preferably have a circumferential, on its outer circumference, has radial bead, which can serve as field relief.
  • the expansion body is designed such that an axial displacement of the same in the direction away from the working end of the central conductor causes a radial spreading of the expansion sleeve
  • the drive element for clamping the change part in the central conductor must therefore transmit compressive forces
  • the external thread of the Drive element cooperates with a corresponding internal thread of an abutment member which is axially connected to the expansion sleeve for transmitting axial tensile forces between the abutment member and the expansion sleeve.
  • the abutment element is formed integrally with the expansion sleeve, which is preferred, the result is a conceivably compact construction with a minimum of components.
  • the expansion sleeve in the region between the abutment element and the region where it is spread radially from the spreader an expansion region, which preferably has a length of at least twice, more preferably at least four times the diameter of the internal thread of the abutment member.
  • the constructive provision of expansion areas for transmitting the forces required for the generation of contact forces between components of the exchangeable exchangeable part and the central conductor makes it possible to exchange forces between these components even under strong pressure pulsations in the working area, so that particularly robust and maintenance-free working electrodes can be provided over a long period of time.
  • the drive element between electrode tip and spreader has a region with a non-rotationally symmetrical cross section, preferably at least two parallel mirror surfaces, which are positively connected with a tool such. a wrench can be taken, for the purpose of rotation of the drive member relative to the expansion sleeve and / or temporarily securing the same against rotation.
  • a seal preferably an O-ring, is disposed between the changing part and the central conductor to prevent penetration of process liquid and dirt into the attachment area between the change part and the central conductor.
  • a seal preferably an O-ring
  • the central conductor in the region of its working end, where it emerges from the insulator body, on its outer circumference on a circumferential, radial bead.
  • the central conductor in the region of its Häend Policy exit from the insulator body on a region with a non-rotationally symmetrical cross-section, preferably two parallel mirror surfaces, for positive cooperation with a tool such. a fork wrench.
  • the central conductor at its end of work End face has at least two end holes for positive engagement with a face spanner.
  • the electrode tip is formed as a spherical cap or as a paraboloid of revolution.
  • Such molds provide a locally defined breakdown starting point while maintaining good electrode tip life
  • a second aspect of the invention relates to a replacement part for a working electrode according to the first aspect of the invention.
  • the change part has an expansion sleeve and a preferably cone-shaped or pyramid-shaped expansion body, which is arranged at least partially within the expansion sleeve and cooperates with it in such a way that the expansion sleeve by an axial displacement of the expansion body relative to it in a region, preferably an end portion of the expansion sleeve , can be spread radially.
  • the spreader preferably cohesively, such as by integral training or by soldering or welding, connected to a drive element for moving the spreader in the expansion sleeve, which protrudes at its end remote from the spreader from the expansion sleeve and at this end a kugelkalottenförmige or rotationsparaboloidförmige Electrode tip forms.
  • the drive element has an external thread on which a preferably nut-like abutment element is arranged with a corresponding internal thread is.
  • the abutment member is axially supported on the expansion sleeve, so that a rotation thereof relative to the drive element can cause an axial movement of the expansion element connected to the drive element in the direction of the electrode tip, which then leads to an increasing spreading of the expansion sleeve.
  • the abutment element is designed as a face nut, preferably with at least two, more preferably with at least four end holes distributed with the same pitch.
  • the face-end nut forms an encircling, radial bead on its outer circumference, and more preferably if it has substantially the shape of a disk with rounded peripheral edges.
  • the abutment element can additionally serve as a field relief.
  • the drive element between the spreader and the external thread on a preferably designed as a stretch or expansion sleeve expansion region, preferably with a length of at least twice, more preferably at least four times the diameter of the external thread.
  • a third aspect of the invention relates to a replacement part for a working electrode according to the first aspect of the invention.
  • the change part has an expansion sleeve and a particular conical or pyramidal expansion body for radially spreading the expansion sleeve by axial displacement of the same relative to the expansion sleeve.
  • the expansion body is preferably cohesively, such as connected by one-piece design or by welding or soldering, with a drive element for moving the expansion body in the expansion sleeve.
  • the drive element protrudes at its end facing away from the spreader out of the expansion sleeve and is at this end as kugelkalottenförmige or one formed Rotationsparaboloidförmige electrode tip.
  • the drive element also has an external thread which cooperates with a corresponding internal thread of an abutment element.
  • the abutment element is, preferably by integral formation, connected to the expansion sleeve, so that a transmission of axial tensile forces between the abutment element and the expansion sleeve is possible and caused by rotation of the drive element relative to the abutment element axial movement of the spreader in a direction away from the electrode tip can be, which then leads to an increasing spreading of the expansion sleeve.
  • the expansion sleeve in the region between the abutment member and the region where it is spread radially from the spreader an expansion region, preferably with a length of at least twice, more preferably at least four times the diameter of the internal thread of the abutment member ,
  • such strain ranges can be recognized by the fact that they have a reduced cross-section in order to obtain a rigid stiffness characteristic as little as possible.
  • the change parts according to the second and third aspects of the invention are preferred commercial goods and allow the construction of working electrodes, in which the electrode tip can be changed easily without disconnecting the electrode from the voltage supply system.
  • a fourth aspect of the invention relates to the use of the working electrode according to the first aspect of the invention for the electrodynamic fragmentation of preferably poorly conductive materials such as concrete or slag. In such uses, the benefits of the invention are particularly evident.
  • Fig. 1 shows the working end of a first inventive working electrode in longitudinal section.
  • the electrode comprises a cylindrical and towards the working end stepwise frusto-conically tapering insulator body 1 made of plastic, with a central conductor 2 arranged in its center made of stainless steel, which is shrunk into the insulator body 1.
  • the central conductor 2 has at its end face on the working side a central cylindrical blind hole which opens towards the working end, at which the central conductor 2 emerges from the insulator body 1 with the formation of a circumferential radial bead 14.
  • a claim according to exchange part 4 comprising a cylindrical, slotted at one end expansion sleeve 24 (not shown cut), which is spread radially by means of a frusto-conical expansion body 25 at its slotted end, such that they in Area of this end is pressed radially to the wall 26 of the blind hole bore and thereby clamped axially immovable in the blind hole.
  • the expansion body 25 is integral with a drive member 27 for axially displacing the same in the expansion sleeve for the purpose of effecting the radial spreading the expansion sleeve is formed, which protrudes at its end remote from the spreader 25 from the expansion sleeve 24 and terminates at this end in a spherical cap electrode tip 3.
  • the drive element 27 has an external thread 28 on which an abutment element 29 designed as a hexagon nut (not shown cut) is arranged with a corresponding internal thread.
  • the abutment member 29 is axially supported on the expansion sleeve 24 (not on the inner conductor 2), so that a rotation of the same relative to the drive member 27 can cause axial movement of the drive member 27 connected to the expansion body 25 in the direction of the electrode tip 3, which Then leads to an increasing spreading of the expansion sleeve 24 and to increase the clamping forces between the wall 26 of the blind hole and the expansion sleeve 24.
  • the drive element 27 is designed as a stretch shaft in the area between the expansion body 25 and the external thread 28 (not visible in the figure).
  • Fig. 2 shows the working end of a second inventive working electrode in longitudinal section, which essentially corresponds in construction to the above-described working electrode.
  • the inner conductor 2 is formed in the present case as a pure cylinder sleeve without radial bead and the abutment member 29 as a disk-shaped Stirnlochmutter with four end holes 23 and rounded peripheral edges, which here form the radial bead 14 of the field relief.
  • the expansion sleeve 24 in this embodiment is shorter and significantly larger in circumference, the expansion body 25 is rather plate-shaped and visible here the expansion shaft 8 of the drive member 27 is shorter than in the example in Fig. 1 ,
  • the insulator body 1, the electrode tip 3, the mirror surfaces 12 and the external thread 28 of the drive element 27 are, however, identical.
  • Fig. 3 shows the working end of a third inventive working electrode in longitudinal section.
  • the electrode here also comprises a cylindrical insulator body 1 which is of frusto-conical shape towards the working end and in the center of which a central conductor 2 is arranged.
  • the central conductor 2 has at its end face on the working end side a central cylindrical bore which, towards the working end, on which the central conductor 2 emerges from the insulator body 1 with the formation of a circumferential radial bead 14, is opened.
  • the radial bead 14 is provided with end bores 23 for engaging a face hole key.
  • an inventive change part 4 Arranged in the central bore of the central conductor 2 is an inventive change part 4, which in the present case comprises an expansion sleeve 24 and a conical spreader 25 for radially spreading the expansion sleeve 24 by axial displacement relative to the same.
  • the expansion body 25 is integrally connected to a drive element 27 for displacing the expansion body 25 in the expansion sleeve 24, which protrudes at its end facing away from the expansion body of the expansion sleeve 24 and is formed at this end as a spherical cap electrode tip 3.
  • the drive element 27 also has an external thread 28 which is screwed into a corresponding internal thread at the working end of the expansion sleeve 24.
  • This area of the expansion sleeve 24 forms a claimed abutment element.
  • Spreader body 25, drive member 27, external thread 28 and electrode tip 3 are thus formed here of a one-piece Einschraubteil, which also has mirror surfaces 12 for cooperation with an insertion or Ausschraubtechnikmaschine and when screwing into the expansion sleeve 24 automatically a spread and corresponding clamping of the same in the bore in the central conductor 2 causes. So that no torsional forces are introduced into the contact surface between the central conductor 2 and the insulator body 1, the central conductor 2 is expediently secured against twisting when screwing in or unscrewing this screw-in part with a face-hole key.

Landscapes

  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Disintegrating Or Milling (AREA)
  • Prevention Of Electric Corrosion (AREA)
  • Electrodes For Compound Or Non-Metal Manufacture (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Discharge Heating (AREA)
EP10009321A 2006-02-15 2006-02-15 Electrode de travail pour une installation de fragmentation électrodynamique Not-in-force EP2266701B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
PCT/CH2006/000100 WO2007093063A1 (fr) 2006-02-15 2006-02-15 Électrode active pour un équipement de fragmentation électrodynamique
EP06701855A EP2026907B1 (fr) 2006-02-15 2006-02-15 Électrode active pour un équipement de fragmentation électrodynamique

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
EP06701855.6 Division 2006-02-15

Publications (2)

Publication Number Publication Date
EP2266701A1 true EP2266701A1 (fr) 2010-12-29
EP2266701B1 EP2266701B1 (fr) 2012-03-14

Family

ID=37045918

Family Applications (2)

Application Number Title Priority Date Filing Date
EP06701855A Active EP2026907B1 (fr) 2006-02-15 2006-02-15 Électrode active pour un équipement de fragmentation électrodynamique
EP10009321A Not-in-force EP2266701B1 (fr) 2006-02-15 2006-02-15 Electrode de travail pour une installation de fragmentation électrodynamique

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP06701855A Active EP2026907B1 (fr) 2006-02-15 2006-02-15 Électrode active pour un équipement de fragmentation électrodynamique

Country Status (10)

Country Link
US (1) US8125129B2 (fr)
EP (2) EP2026907B1 (fr)
JP (1) JP5049297B2 (fr)
AT (2) ATE549089T1 (fr)
AU (2) AU2006338157C1 (fr)
CA (1) CA2642411C (fr)
DE (1) DE502006008364D1 (fr)
DK (2) DK2026907T3 (fr)
ES (2) ES2383785T3 (fr)
WO (1) WO2007093063A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010015343B4 (de) * 2010-04-17 2018-04-05 Borgwarner Ludwigsburg Gmbh HF-Zündeinrichtung und Verfahren zu ihrer Herstellung
WO2013053066A1 (fr) * 2011-10-10 2013-04-18 Selfrag Ag Procédé destiné à fragmenter et/ou à pré-affaiblir un matériau au moyen de décharges à haute tension
PL2888053T3 (pl) * 2012-08-24 2017-01-31 Selfrag Ag Sposób i urządzenie do rozdrabniania i/lub osłabiania materiału za pomocą impulsów wysokonapięciowych
CN104736664B (zh) * 2012-10-17 2016-09-14 宇部兴产株式会社 波长转换部件及使用其的发光装置
CN105845123B (zh) * 2016-03-21 2019-04-19 西北工业大学 一种大功率水下等离子体强声源的放电电极头
CN109551067B (zh) * 2019-01-22 2023-12-22 崇义章源钨业股份有限公司 火花机电极
RU2733413C1 (ru) * 2020-01-14 2020-10-01 Сергей Николаевич Ким Стойкий рабочий электрод для электрогидравлических и электроимпульсных устройств

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Publication number Priority date Publication date Assignee Title
US4458153A (en) 1982-09-13 1984-07-03 Wesley Richard H Organism destruction by electrohydraulic discharge within a pulsed magnetic field envelope
DE3844419A1 (de) 1987-12-30 1989-07-20 Viktor Nikolaevic Zacharov Unterwasserentlader zur zertruemmerung von konkrementen
SU1781892A1 (ru) 1989-12-28 1996-08-10 Экспериментальный кооператив "ЭГИДА-А" Высоковольтный электрод
SU1790069A1 (ru) 1990-04-06 1996-08-10 Экспериментальный кооператив "ЭГИДА-А" Высоковольтный электрод установки электрогидравлического дробления
JP2003001137A (ja) 2001-06-19 2003-01-07 Sumitomo Electric Ind Ltd 破砕装置用電極および破砕装置
US20050150688A1 (en) * 2002-02-12 2005-07-14 Macgregor Scott J. Plasma channel drilling process
US20050150668A1 (en) 2003-12-29 2005-07-14 Jim Williamson Box scraper with scarifier

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JPS6198897A (ja) * 1984-10-19 1986-05-17 株式会社　スギノマシン 脆性物体の破砕方法およびその装置
JPH03113110A (ja) * 1989-09-25 1991-05-14 Masahiko Kono アンカーボルト構造体
US5420473A (en) 1993-10-12 1995-05-30 Thomas; Howard C. Spark gap electrode assembly for lithotripters
JPH09192526A (ja) * 1996-01-12 1997-07-29 Kobe Steel Ltd 放電破砕装置
JP2000018227A (ja) * 1998-07-03 2000-01-18 Hazama Gumi Ltd 二重ボルト及び位置調整用具
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Publication number Priority date Publication date Assignee Title
US4458153A (en) 1982-09-13 1984-07-03 Wesley Richard H Organism destruction by electrohydraulic discharge within a pulsed magnetic field envelope
DE3844419A1 (de) 1987-12-30 1989-07-20 Viktor Nikolaevic Zacharov Unterwasserentlader zur zertruemmerung von konkrementen
SU1781892A1 (ru) 1989-12-28 1996-08-10 Экспериментальный кооператив "ЭГИДА-А" Высоковольтный электрод
SU1790069A1 (ru) 1990-04-06 1996-08-10 Экспериментальный кооператив "ЭГИДА-А" Высоковольтный электрод установки электрогидравлического дробления
JP2003001137A (ja) 2001-06-19 2003-01-07 Sumitomo Electric Ind Ltd 破砕装置用電極および破砕装置
US20050150688A1 (en) * 2002-02-12 2005-07-14 Macgregor Scott J. Plasma channel drilling process
US20050150668A1 (en) 2003-12-29 2005-07-14 Jim Williamson Box scraper with scarifier

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DATABASE WPI Week 199712, Derwent World Patents Index; AN 1997-130988, XP002402088 *
DATABASE WPI Week 199712, Derwent World Patents Index; AN 1997-131002, XP002402087 *

Also Published As

Publication number Publication date
AU2006338157C1 (en) 2011-05-19
AU2006338157B2 (en) 2010-11-11
WO2007093063A1 (fr) 2007-08-23
EP2026907B1 (fr) 2010-11-17
DK2266701T3 (da) 2012-07-09
EP2026907A1 (fr) 2009-02-25
JP5049297B2 (ja) 2012-10-17
CA2642411C (fr) 2013-08-13
US8125129B2 (en) 2012-02-28
US20090153009A1 (en) 2009-06-18
JP2009526636A (ja) 2009-07-23
EP2266701B1 (fr) 2012-03-14
ATE488299T1 (de) 2010-12-15
ATE549089T1 (de) 2012-03-15
DE502006008364D1 (de) 2010-12-30
AU2011200094B2 (en) 2013-01-10
CA2642411A1 (fr) 2007-08-23
AU2006338157A1 (en) 2007-08-23
ES2383785T3 (es) 2012-06-26
ES2353901T3 (es) 2011-03-08
AU2011200094A1 (en) 2011-01-27
DK2026907T3 (da) 2011-02-28

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