EP1891842A2 - Plasma cutting device with pneumatic striking - Google Patents
Plasma cutting device with pneumatic strikingInfo
- Publication number
- EP1891842A2 EP1891842A2 EP06744806A EP06744806A EP1891842A2 EP 1891842 A2 EP1891842 A2 EP 1891842A2 EP 06744806 A EP06744806 A EP 06744806A EP 06744806 A EP06744806 A EP 06744806A EP 1891842 A2 EP1891842 A2 EP 1891842A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- cylinder
- piston
- electrode
- nozzle
- 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.)
- Granted
Links
- 239000012530 fluid Substances 0.000 claims description 11
- 239000011810 insulating material Substances 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 3
- 230000003042 antagnostic effect Effects 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 230000000295 complement effect Effects 0.000 claims description 2
- 238000001816 cooling Methods 0.000 description 7
- 238000000926 separation method Methods 0.000 description 2
- 239000004020 conductor Substances 0.000 description 1
- 239000012777 electrically insulating material Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H1/00—Generating plasma; Handling plasma
- H05H1/24—Generating plasma
- H05H1/26—Plasma torches
- H05H1/32—Plasma torches using an arc
- H05H1/34—Details, e.g. electrodes, nozzles
Definitions
- the present invention relates to the devices to generate a plasma jet, such as for cutting and in particular it refers to a plasma cutting device with pneumatic contact striking, of torch type, which can be handled manually or can be associated with a robotized arm or with an automatic machine.
- the jet striking is effected translating the electrode from a contact condition with the nozzle to a separation condition of this latter by means of pneumatic type driving means.
- a drawback of said torches consists in that the conformation and the disposition of the known pneumatic type driving means are very bulky so reducing handling and/or causing limits in manual or machine applications.
- An object of the present invention is to propose a plasma cutting device with pneumatic striking, consisting of a small sized and compact torch, allowing easy handling and that can be simply used manually or with automatic machines.
- Another object is to propose a very efficient device having a low consumption of air or of a generic active fluid.
- Further object is to propose a device provided with a fluid feeding connection back positioned and axial or inclined oriented.
- Another object is to propose a device provided with a suitable cooling.
- FIG. 1 shows a schematic longitudinal section view of the plasma cutting device with pneumatic striking, of the present invention, in a rest condition and in which some parts are removed for better evidencing others parts;
- - figure 2 shows a longitudinal section view of the device of figure 1 in an operational condition
- - figure 3 shows a transversal section view according to the plane III - III of figure 2, of a cylinder of the device
- figure 4 shows a schematic longitudinal section view of a first variant of the device of figure 1 represented in the rest condition and in which some parts are removed for better evidencing others parts;
- FIG. 5 shows a longitudinal section view of the variant of the device of figure 4 in the operational condition
- FIG. 6 shows a schematic longitudinal section view of a second variant of the device of figure 1 represented in the rest condition and in which some parts are removed for better evidencing other parts;
- figure 7 shows a longitudinal section view of the variant of the device of figure 6 in the operational condition
- the numeral 1 indicates the plasma cutting device with pneumatic contact striking, object of the present invention.
- the device 1 is provided with a cylinder 4, consisting of a metallic cylindrical wall for the sliding stroke of a pneumatic piston 5, made of electrically insulating material, fit to move an electrode 2, movable inside a nozzle 3, for the plasma outlet, between a rest condition R and an operational condition O, in which the electrode 2 and the nozzle 3 are respectively in mutual contact and spaced apart.
- a cylinder 4 consisting of a metallic cylindrical wall for the sliding stroke of a pneumatic piston 5, made of electrically insulating material, fit to move an electrode 2, movable inside a nozzle 3, for the plasma outlet, between a rest condition R and an operational condition O, in which the electrode 2 and the nozzle 3 are respectively in mutual contact and spaced apart.
- the electrode 2 and the nozzle 3 are electrically isolated and, in the operational condition O, are under a big electric potential difference necessary to support the plasma jet.
- the piston 5 is connected to the electrode 2 directly or at a short distance from this latter; particularly said distance is shorter than four times of the maximum transversal dimension of the electrode 2.
- said distance is shorter than the maximum diameter of the electrode.
- the invention provides that the piston is fixed at a distance to the free end of the electrode, or to the end of this tatter contacting with the nozzle in the rest condition, shorter than the half, or one-third or one-fourth of the total length of the torch,
- the device comprises elastic means 20 fit to provide the antagonistic elastic force against the pneumatic force of the piston 5 fit to move the electrode 2 between the operational condition O and the rest condition R.
- the device comprises a metallic stem 6 of elongated tubular shape, whose one first end, faced toward the nozzle 3, has a female screw connection 7 for a thread connection portion of the electrode.
- the piston 5 is blocked the stem 6 by means of a block pin 27 inserted in diametrical holes of said piston and stem.
- the electrode 2, the nozzle 3, the cylinder 4 for the sliding of the piston, the piston 5 and the stem 6 are coaxial positioned with the longitudinal axis of the device.
- the active fluid preferably consisting of compressed air fit to the plasma formation and to the cooling, is flowed along the longitudinal internal hollow of the tubular stem 6.
- the second end of the stem 6, opposite in respect to the first end connected to the electrode has an inlet for the active fluid and its first end portion, comprising the respective first end, has a set of outlets 8 for said fluid, consisting of radial holes passing through the wail of the stem and flowing into a first chamber 9 of the cylinder 4.
- Said first chamber 9 is delimited by the piston 5 and by a separator 10, made of insulating material and fixed in an irremovable manner to the cylinder 4 to form a head, and provided with a hole slidingly engaged by the stem 6 or by the electrode.
- the separator 10 is interposed between the piston and the electrode.
- the cylinder 4 has at least a first outlet 11, constituted by a set of radial holes passing through the wall of the cylinder and lying on a plane orthogonal in respect to the stem. Said holes are made in a position approximately corresponding to the end of the first chamber opposite to the separator in a manner that the first outlet 11 is at least partially closed by the piston in the rest condition R and at least partially opened in the operational condition O.
- the first outlet 11 of the first chamber 9 is in flow communication with a duct 12 externally delimited by an external sleeve 13 and internally delimited by portions of the separator 10, of a diffuser 14, of the nozzle 3, of the cylinder 4 and of the sleeve 13.
- the first outlet 1 1 flows in the volume between the nozzle 3 and the electrode 2 through said duct 12 and a plurality of passing holes of the diffuser 14 that is made of insulating material and is interposed between the separator 10 and the nozzle 3.
- the first outlet 11 of the first chamber 9 is also in flow communication with the external volume around the nozzle 3 through the duct 12 and a plurality of passing holes 15 of the external sleeve 13.
- An end of the fixed tubular member 16 is inside the cylinder 4 and it serves as end stroke 18 for the piston 5 in the operational condition O determining the maximum distance between the electrode and the nozzle in said condition.
- the elastic means 20 are of metallic helicoidal shape type and are interposed between the piston 5 and a tubular shaped stop mean 19 inside the cylinder. Said stop mean is carried out by an abutment obtained internally in the connection portion 17 of the cylinder 4 or, in alternative, in the fixed tubular member 16.
- the piston 5 is provided with at least an annular sealing mean 28, for instance of O-Ring type.
- the cylinder is equipped with a second outlet 22, constituted by one or more passing holes carried out in the cylindrical wall of the end opposite to the separator of the second chamber of the cylinder 4, in opposite to the first chamber 9 in respect to the piston 5.
- Said second outlet 22 is fit to maintain the second chamber almost at atmospheric pressure also in case of compressed air entering therein.
- the separator 10, the diffuser 14 and the nozzle 3 are interposed between the cylinder 4 and the sleeve 13 and these two latter are mutually fixed by screw for clamping the diffuser and the nozzle.
- the invention provides that the cylinder 4 can be provided with a set of optional openings 29, each of them being constituted by a passing hole flowing into the portion of second chamber of the cylinder, in which are housed the elastic means 20, and in flow communication with the duct 12 delimited by the sleeve 13, by means of respective optional longitudinal grooves 30 obtained on the external face of the cylinder 4.
- the axis of the holes of the optional openings 29 are radial oriented or preferably, inclined in the same manner to generate a spiral air flow to improve the cooling.
- the invention thus provides that the first outlet 11 of the first chamber 9 is in flow communication with the outside through the duct 12, the optional longitudinal grooves 30, the optional openings 29, the second chamber of the cylinder.4 and the second outlet 22 of the cylinder 4 producing an air flow for cooling the portions of the device adjacent to the elastic means 20.
- the torch equipped with the latter increases the thermal dissipation and the electric power.
- the invention provides to regulate the air capacity and then the cooling of the area near the elastic means by modifying the diameter and/or the number of the holes of the optional openings 29.
- the operation of the device 1 provides that, for starting the operational condition, the device is supplied with electric power and with the compressed air that, flowing through the stem in the first chamber 9, it increases the internal pressure of this latter effecting a force on the piston causing the translation thereof overcoming the force of the elastic means 20.
- Said translation provokes the opening of the first outlet 11 of the cylinder and thus the air flow through the nozzle in which, thanks to the separation of the electrode, the arc strikes and produces the plasma coming out from the nozzle to allow the cutting.
- Said device requires a very low air consumption and is particularly suitable for devices with medium and low amperage level.
- the variant of the device of figures 4 and 5 is particularly suitable for devices with medium and high amperage level and it provides that the first outlet 11 of the first chamber 9 is in flow communication with the outside through the duct 12, through a plurality of passing holes 2I 3 made in inclined manner through the wall of the cylinder 4; said passing holes 21 connect the duct 12 with the second chamber of the cylinder 4 opposite to the first chamber 9 in respect to the piston 5.
- the flow communication proceeds from the second chamber of the cylinder 4, through the second outlet 22 of the cylinder 4 to the outside generating an air flow for cooling the portions of the device near the elastic means 20.
- the elastic means 20, of helical metallic spring type are interposed between the second end of the stem 6, opposite to the electrode 2, and an annular abutment 23 inside the fixed tubular member 16.
- the stem 6 has a transversal pin 24 whose anti-rotation ends 25, protruding from the stem 6, are slidingly housed in the respective concave longitudinal housing 26 carried out in the fixed tubular member 16. Said variant also allows to further reduce the dimensions of the device.
- the power supply of the electrode is provided by means of the spring of the elastic means 20 or by means of a flexible or sliding connecting conductor element of the electrode or of the stem, to the annular abutment 23 electrically connected to the power terminal or directly to said terminal.
- the main advantage of the present invention is to provide a small and compact pneumatic striking plasma cutting device which can be handled in a very simple manner and that can be easily manually used or suitable for automatic machines.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT000386A ITBO20050386A1 (en) | 2005-06-03 | 2005-06-03 | PLASMA CUTTING DEVICE WITH PNEUMATIC TRIM |
PCT/IB2006/001438 WO2006129179A2 (en) | 2005-06-03 | 2006-06-01 | Plasma cutting device with pneumatic striking |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1891842A2 true EP1891842A2 (en) | 2008-02-27 |
EP1891842B1 EP1891842B1 (en) | 2013-02-27 |
Family
ID=36778322
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06744806A Expired - Fee Related EP1891842B1 (en) | 2005-06-03 | 2006-06-01 | Plasma cutting device with pneumatic striking |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1891842B1 (en) |
IT (1) | ITBO20050386A1 (en) |
WO (1) | WO2006129179A2 (en) |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4791268A (en) * | 1987-01-30 | 1988-12-13 | Hypertherm, Inc. | Arc plasma torch and method using contact starting |
US4902871A (en) * | 1987-01-30 | 1990-02-20 | Hypertherm, Inc. | Apparatus and process for cooling a plasma arc electrode |
FR2626206B1 (en) | 1988-01-25 | 1990-05-18 | Soudure Autogene Francaise | TORCH AND ARC WORKING MACHINE, AND CARTRIDGE THEREFOR |
US5796067A (en) * | 1995-10-30 | 1998-08-18 | The Lincoln Electric Company | Plasma arc torches and methods of operating and testing the same |
US6472631B1 (en) * | 2001-05-04 | 2002-10-29 | Hypertherm, Inc. | Strain relief mechanism for a plasma arc torch |
-
2005
- 2005-06-03 IT IT000386A patent/ITBO20050386A1/en unknown
-
2006
- 2006-06-01 WO PCT/IB2006/001438 patent/WO2006129179A2/en not_active Application Discontinuation
- 2006-06-01 EP EP06744806A patent/EP1891842B1/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO2006129179A2 * |
Also Published As
Publication number | Publication date |
---|---|
WO2006129179A3 (en) | 2007-03-01 |
EP1891842B1 (en) | 2013-02-27 |
ITBO20050386A1 (en) | 2006-12-04 |
WO2006129179A2 (en) | 2006-12-07 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
KR101242489B1 (en) | Interchangeable plasma nozzle interface | |
EP3153693A1 (en) | Fuel injector | |
US11148156B2 (en) | Switching valve and intermittent air blow gun | |
US4090816A (en) | Electromagnetic fluid operating apparatus | |
EP1891842B1 (en) | Plasma cutting device with pneumatic striking | |
US10060656B2 (en) | Pulse tube refrigerator | |
EP3563644A1 (en) | Mobile contact device for an electrode of a plasma torch and tool for fixing said device | |
US10655646B2 (en) | Compressed gas supplier for a pneumatic tool | |
KR102091416B1 (en) | Plasma Torch | |
CN208853989U (en) | A kind of laminar flow plasma water cutting gun | |
JP6578397B2 (en) | Pneumatic tool with adjustable torque | |
LU93188B1 (en) | Two stages gas pressure regulator with cylindrical body | |
KR200416189Y1 (en) | Cool gun of compression air | |
CN109366021A (en) | A kind of laminar flow plasma water cutting gun | |
EP1395097B1 (en) | Device for plasma cutting | |
TW202014613A (en) | Fluid pressure cylinder | |
TWI622450B (en) | Nozzle of air plasma cutting device | |
CN212311134U (en) | High-frequency, non-high-frequency and non-high-frequency shared plasma cutting gun head | |
CN214999639U (en) | Safety valve of high-pressure cleaning machine | |
JP6773918B2 (en) | Gas circuit breaker | |
CN218902547U (en) | Pneumatic vibrator | |
WO2019106841A1 (en) | Gas circuit breaker | |
JP3793680B2 (en) | Plasma torch with electrode back cooling | |
JP7155283B2 (en) | gas circuit breaker | |
CN111037072A (en) | High-frequency and non-high-frequency shared plasma cutting gun head |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 20080103 |
|
AK | Designated contracting states |
Kind code of ref document: A2 Designated state(s): DE ES FR GB IT |
|
RBV | Designated contracting states (corrected) |
Designated state(s): DE ES FR GB IT |
|
DAX | Request for extension of the european patent (deleted) | ||
17Q | First examination report despatched |
Effective date: 20090617 |
|
GRAP | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
|
GRAS | Grant fee paid |
Free format text: ORIGINAL CODE: EPIDOSNIGR3 |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): DE ES FR GB IT |
|
REG | Reference to a national code |
Ref country code: GB Ref legal event code: FG4D |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R096 Ref document number: 602006034752 Country of ref document: DE Effective date: 20130418 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: ES Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20130607 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 20130528 Year of fee payment: 8 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 20130620 Year of fee payment: 8 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 20130828 Year of fee payment: 8 |
|
PLBI | Opposition filed |
Free format text: ORIGINAL CODE: 0009260 |
|
26 | Opposition filed |
Opponent name: AIR LIQUIDE WELDING FRANCE Effective date: 20131115 |
|
PLAX | Notice of opposition and request to file observation + time limit sent |
Free format text: ORIGINAL CODE: EPIDOSNOBS2 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R026 Ref document number: 602006034752 Country of ref document: DE Effective date: 20131115 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R082 Ref document number: 602006034752 Country of ref document: DE Representative=s name: BOCKHORNI & KOLLEGEN PATENT- UND RECHTSANWAELT, DE Ref country code: DE Ref legal event code: R082 Ref document number: 602006034752 Country of ref document: DE Representative=s name: HEYER, VOLKER, DIPL.-PHYS. DR.RER.NAT., DE |
|
PLAF | Information modified related to communication of a notice of opposition and request to file observations + time limit |
Free format text: ORIGINAL CODE: EPIDOSCOBS2 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R082 Ref document number: 602006034752 Country of ref document: DE Representative=s name: HEYER, VOLKER, DIPL.-PHYS. DR.RER.NAT., DE |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: IT Payment date: 20140611 Year of fee payment: 9 |
|
PLBB | Reply of patent proprietor to notice(s) of opposition received |
Free format text: ORIGINAL CODE: EPIDOSNOBS3 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R119 Ref document number: 602006034752 Country of ref document: DE |
|
GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 20140601 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST Effective date: 20150227 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R119 Ref document number: 602006034752 Country of ref document: DE Effective date: 20150101 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20150101 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20140630 Ref country code: GB Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20140601 |
|
PLCK | Communication despatched that opposition was rejected |
Free format text: ORIGINAL CODE: EPIDOSNREJ1 |
|
PLBN | Opposition rejected |
Free format text: ORIGINAL CODE: 0009273 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: OPPOSITION REJECTED |
|
27O | Opposition rejected |
Effective date: 20150911 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20150601 |