EP1123777B1 - Device for defusing explosive charges by low pressure water jet cutting - Google Patents

Device for defusing explosive charges by low pressure water jet cutting Download PDF

Info

Publication number
EP1123777B1
EP1123777B1 EP01400324A EP01400324A EP1123777B1 EP 1123777 B1 EP1123777 B1 EP 1123777B1 EP 01400324 A EP01400324 A EP 01400324A EP 01400324 A EP01400324 A EP 01400324A EP 1123777 B1 EP1123777 B1 EP 1123777B1
Authority
EP
European Patent Office
Prior art keywords
water
cutting
abrasive
abrasive jet
circular cutting
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
EP01400324A
Other languages
German (de)
French (fr)
Other versions
EP1123777A1 (en
Inventor
Charles Ac'h
François Jaouen
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.)
Bourgogne Hydro
Direction General pour lArmement DGA
Etat Francais
Original Assignee
Bourgogne Hydro
Direction General pour lArmement DGA
Etat Francais
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 Bourgogne Hydro, Direction General pour lArmement DGA, Etat Francais filed Critical Bourgogne Hydro
Publication of EP1123777A1 publication Critical patent/EP1123777A1/en
Application granted granted Critical
Publication of EP1123777B1 publication Critical patent/EP1123777B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
    • B24C1/04—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for treating only selected parts of a surface, e.g. for carving stone or glass
    • B24C1/045—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for treating only selected parts of a surface, e.g. for carving stone or glass for cutting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C3/00—Abrasive blasting machines or devices; Plants
    • B24C3/02—Abrasive blasting machines or devices; Plants characterised by the arrangement of the component assemblies with respect to each other
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C3/00—Abrasive blasting machines or devices; Plants
    • B24C3/02—Abrasive blasting machines or devices; Plants characterised by the arrangement of the component assemblies with respect to each other
    • B24C3/04—Abrasive blasting machines or devices; Plants characterised by the arrangement of the component assemblies with respect to each other stationary

Definitions

  • the technical sector of the present invention is that of circular cutting devices by abrasive water jet used for the neutralization of explosive devices, including improvised explosive devices or trapped packages placed inside a strong enclosure.
  • 5,759,086 which describes a device for cutting parts by abrasive blasting.
  • This device consists in particular of a cutting head, comprising at least two guns, each emitting a jet. Mon guns are movable with respect to each other, so that the axes of the guns form an angle such that the jets converge at the same point of cut.
  • the cutting head is intended to be mounted on a moving rail.
  • This device has the disadvantage of being able to allow cutting only rectilinearly.
  • doubling the impact of the jet on the same point can cause significant vibration and heating of the workpiece, phenomena to avoid when neutralizing explosive devices.
  • the object of the present invention is to overcome the drawbacks mentioned above, by proposing a circular cutting device, intended to overcome the phenomenon of residual attachment, to ensure a fast cutting time.
  • the present invention also aims to provide a circular cutting device, implementing a lower abrasive jet pressure vis-à-vis existing devices to overcome the vibration and heating phenomena encountered during cutting.
  • Another aim is, finally, to set up a circular cutting device, overcoming the risk of obstruction of the pipes and wear of the head.
  • the invention relates to an abrasive water jet circular cutting device comprising a cutting head equipped with at least two guns having parallel axes. These guns have the particularity of being mounted, each of them, at different distances from the axis of the cutting head, at a barrel chamber, surmounted by a distribution chamber.
  • the spacing distance in the implantation of the barrels relative to the cutting head axis has a value less than or equal to the thickness of the cutting line caused by the abrasive water jet.
  • Each barrel has a nozzle mixing chamber and an abrasive inlet.
  • the distribution chamber is connected to a water inlet under pressure. Preferably, this arrival will be set at a pressure of less than 200 bar.
  • This device is characterized in that the dispensing chamber is surmounted by a needle valve actuated, preferably, by a pneumatic, hydraulic or electrical type of control. The entire device is driven by a rotational movement, preferably with the aid of a geared motor.
  • This circular cutting device developed with several guns, placed at distances from the cutting head axis, has the advantage of reducing the cutting cycle time and performing a total cut, without residual attachment, with the maximum guarantee.
  • the abrasive water jet circular cutting device has the advantage of being a device requiring a lower energy source than for other devices.
  • the principle of performing abrasive mixing directly in the head also has the advantage of reducing the wear of the components, and increasing their longevity, and gives greater efficiency to drilling and cutting.
  • Another advantage lies in the use of a low pressure, less than or equal to 200 bars. The use of such a pressure eliminates the vibrations induced on the explosive device and also reduces the total thrust force to less than 1 daN on the entire machine treated. The risks of movement and untimely explosion are thus minimized.
  • the use of a low pressure also makes it possible to bring a lot of water and to avoid overheating due to cutting, as well as the phenomenon of sparkling.
  • FIG. 1 is a presentation by the vertical axis of the circular cutting device by abrasive water jet.
  • This device consists of a water distribution chamber (1) connected to a water inlet under pressure of less than 200 bar (2) and surmounted by a needle valve (3).
  • This needle valve is actuated by pneumatic, hydraulic or electric control (4).
  • the water distribution chamber (1) is secured to a barrel chamber (5).
  • This chamber assembles the guns (6), each equipped with a mixing chamber with nozzle (9) and an abrasive inlet (7).
  • the entire cutting device is rotated by a gear motor (8).
  • FIG. 2 shows an overview of the system comprising the barrel (6), the mixing chamber with nozzle (9) and the abrasive inlet (7), as well as the water (10) allowing the mounting on the barrel chamber (5).
  • the water supplied by the feed (2) is admitted into the distribution chamber (1) through an orifice released by the needle valve (3) actuated by the control system (4). This water reaches a dynamic pressure less than or equal to 200 bars.
  • the flow of water is established in the mixing chambers (9) and by venturi effect causes the additive of the polymer or abrasive type coming from each mixing chamber by the arrivals (7).
  • This additive is sucked and mixed with pressurized water from the distribution chamber (1).
  • the water / additive pressure mixture exits through the guns (6).
  • the circular cutting operation can begin. It is a question first to make a hole of drilling. Once this hole is made, the circular cut can begin, by the rotation of the cutting head, controlled by the gear motor (8). To reduce the angle of rotation, and therefore the cutting time, the head shown in Figure 1 was equipped with four barrels.
  • this cutting head is the provision of these guns (6) on the guns chamber (5) to eliminate the phenomenon of residual attachment.
  • the four guns were arranged in pairs at a distance different from the axis of the cutting head. This difference in distance has as a maximum value the thickness of the cut line caused by the jet of abrasive water.
  • the abrasive water mixing jet does not pass back into an initial drilling hole and the prolongation of the rotation of the cutting head over an angle greater than 90 degrees ensures a complete cut with removal of any residual fastener.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Earth Drilling (AREA)
  • Nozzles (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)

Abstract

The abrasive water jet circular cutter comprises a cutting head fitted with at least two canons (6) with parallel axes. The canons are mounted at different distances from the cutting head axis are arranged so that the gap in the siting of the canons relative to the cutting head axis has a value less than the thickness if the cutting line caused by the water jet (3). The canons each have a mixing chamber with a nozzle and an abrasive inlet (7). The distribution chamber (1) is connected to a pressurized water inlet (2).

Description

Le secteur technique de la présente invention est celui des dispositifs de coupe circulaire par jet d'eau abrasif utilisés pour la neutralisation d'engins explosifs, notamment d'engins explosifs improvisés ou colis piégés placés à l'intérieur d'une enceinte résistante.The technical sector of the present invention is that of circular cutting devices by abrasive water jet used for the neutralization of explosive devices, including improvised explosive devices or trapped packages placed inside a strong enclosure.

Dans ce domaine, plusieurs réalisations se rapportant à des dispositifs de coupe ont déjà été proposées.
On connait notamment les systèmes du type MARLIN de la société ALVIS, ou EXCALIBUR de la société ALBA INDUSTRIE. Ces systèmes fonctionnent sur le principe d'une pompe haute pression alimentant en mélange eau et abrasif une tête de coupe. Cette tête, équipée d'une chambre et d'un ensemble buse-canon unique, peut effectuer une rotation autour d'un axe. Placée devant un corps métallique, elle permet la réalisation d'une découpe circulaire, par projection du mélange eau-abrasif.
Ces différents dispositifs présentent cependant l'inconvénient de fonctionner avec un mélange eau-abrasif dès la sortie de la pompe de mise en pression, ce qui peut engendrer des problèmes d'obstruction des tuyauteries, dus à une mauvaise homogénéité du mélange, ainsi qu'une usure prématurée de la tête. Ce mode de fonctionnement nécessite de plus l'utilisation d'une forte pression, de l'ordre de 600 bars. La génération de cette pression requiert l'usage d'un appareil de puissance élevée. Elle génère par ailleurs un effort non négligeable sur l'engin explosif à neutraliser, ainsi que son échauffement. Un autre inconvénient réside dans l'utilisation d'un seul canon qui entraîne un temps de coupe relativement important et s'associe aussi à un phénomène d'attache résiduelle. Ce phénomème qui empêche une séparation complète des pièces peut être supprimé en diminuant la vitesse de déplacement circulaire du canon, mais cela augmente d'autant le cycle de découpe.
On connaît également le brevet US 5 759 086, qui décrit un dispositif de découpe de pièces par jet abrasif. Ce dispositif se compose notamment d'une tête de coupe, comportant au moins deux canons, émettant chacun un jet. L'un des canons est mobile vis-à-vis de l'autre, de manière à ce que les axes des canons forment un angle tel que les jets convergent au niveau d'un même point de coupe. De plus, la tête de coupe est destinée à être montée sur un rail de déplacement.
Ce dispositif présente l'inconvénient de ne pouvoir permettre de découpe que de manière rectiligne. De plus, le fait de doubler l'impact du jet sur un même point peut entraîner des vibrations importantes ainsi qu'un échauffement de la pièce à découper, phénomènes à éviter lors de la neutralisation d'engins explosifs.In this field, several embodiments relating to cutting devices have already been proposed.
We know in particular the systems of the MARLIN type of the company ALVIS, or EXCALIBUR of the company ALBA INDUSTRIE. These systems operate on the principle of a high pressure pump supplying water mixture and abrasive a cutting head. This head, equipped with a chamber and a single nozzle-nozzle assembly, can rotate about an axis. Placed in front of a metal body, it allows the realization of a circular cut, by projection of the water-abrasive mixture.
These different devices, however, have the disadvantage of operating with a water-abrasive mixture right out of the pressurizing pump, which can cause problems of obstruction of the pipes, due to poor homogeneity of the mixture, as well as premature wear of the head. This operating mode also requires the use of a high pressure, of the order of 600 bars. The generation of this pressure requires the use of a high power apparatus. It also generates a significant effort on the explosive device to neutralize, as well as its heating. Another disadvantage is the use of a single barrel which causes a relatively large cutting time and also associated with a residual attachment phenomenon. This phenomenon which prevents a complete separation of the pieces can be suppressed by decreasing the speed of circular movement of the barrel, but this increases all the cutting cycle.
Also known is US Pat. No. 5,759,086, which describes a device for cutting parts by abrasive blasting. This device consists in particular of a cutting head, comprising at least two guns, each emitting a jet. Mon guns are movable with respect to each other, so that the axes of the guns form an angle such that the jets converge at the same point of cut. In addition, the cutting head is intended to be mounted on a moving rail.
This device has the disadvantage of being able to allow cutting only rectilinearly. In addition, doubling the impact of the jet on the same point can cause significant vibration and heating of the workpiece, phenomena to avoid when neutralizing explosive devices.

Le but de la présente invention est de remédier aux inconvénients rappelés ci-dessus, en proposant un dispositif de coupe circulaire, destiné à pallier au phénomène d'attache résiduelle, afin d'assurer un temps de découpe rapide.
La présente invention a également pour but de proposer un dispositif de découpe circulaire, mettant en oeuvre une pression de jet abrasif moindre vis-à-vis des dispositifs existants, afin de pallier aux phénomènes de vibration et d'échauffement rencontré lors de la découpe.
Un autre de but est, enfin, de mettre en place un dispositif de découpe circulaire, palliant aux risques d'obstruction des tuyauteries et d'usure de la tête.The object of the present invention is to overcome the drawbacks mentioned above, by proposing a circular cutting device, intended to overcome the phenomenon of residual attachment, to ensure a fast cutting time.
The present invention also aims to provide a circular cutting device, implementing a lower abrasive jet pressure vis-à-vis existing devices to overcome the vibration and heating phenomena encountered during cutting.
Another aim is, finally, to set up a circular cutting device, overcoming the risk of obstruction of the pipes and wear of the head.

Pour répondre à ces différents buts, l'invention a pour objet un dispositif de coupe circulaire par jet d'eau abrasif comprenant une tête de coupe équipée d'au moins deux canons ayant des axes parallèles. Ces canons présentent la particularité d'être montés, chacun d'eux, à des distances différentes de l'axe de la tête de coupe, au niveau d'une chambre porte-canons, surmontée d'une chambre de distribution. L'écart de distance dans l'implantation des canons par rapport à l'axe de tête de coupe a une valeur inférieure ou égale à l'épaisseur du trait de coupe provoqué par le jet d'eau abrasif.To meet these various aims, the invention relates to an abrasive water jet circular cutting device comprising a cutting head equipped with at least two guns having parallel axes. These guns have the particularity of being mounted, each of them, at different distances from the axis of the cutting head, at a barrel chamber, surmounted by a distribution chamber. The spacing distance in the implantation of the barrels relative to the cutting head axis has a value less than or equal to the thickness of the cutting line caused by the abrasive water jet.

Chaque canon comporte une chambre de mélange avec buse et une arrivée d'abrasif. La chambre de distribution est reliée à une arrivée d'eau sous pression. De préférence, cette arrivée sera fixée à une pression inférieure à 200 bars. Ce dispossitif se caractérise par le fait que la chambre de distribution est surmontée d'une vanne à pointeau actionnée, de préférence, par une commande de type pneumatique, hydraulique ou électrique. L'ensemble du dispositif est animé d'un mouvement de rotation, de préférence, à l'aide d'un moto-réducteur.Each barrel has a nozzle mixing chamber and an abrasive inlet. The distribution chamber is connected to a water inlet under pressure. Preferably, this arrival will be set at a pressure of less than 200 bar. This device is characterized in that the dispensing chamber is surmounted by a needle valve actuated, preferably, by a pneumatic, hydraulic or electrical type of control. The entire device is driven by a rotational movement, preferably with the aid of a geared motor.

Ce dispositif de découpe circulaire développé avec plusieurs canons, placés à des distances de l'axe de tête de coupe, présente l'avantage de réduire le temps de cycle de coupe et d'effectuer une découpe totale, sans attache résiduelle, avec le maximum de garantie.
Le dispositif de coupe circulaire par jet d'eau abrasif présente l'avantage d'être un dispositif nécessitant une source d'énergie plus faible que pour les autres dispositifs. Le principe d'effectuer le mélange abrasif directement dans la tête a aussi l'avantage de diminuer l'usure des composants, et d'augmenter leur longévité, et donne une plus grande efficacité au perçage et à la coupe.
Un autre avantage réside dans l'utilisation d'une faible pression, inférieure ou égale à 200 bars. L'utilisation d'une telle pression supprime les vibrations induites sur l'engin explosif et permet aussi de réduire l'effort total de poussée à moins de 1 daN sur l'ensemble de l'engin traité. Les risques de mouvement et d'explosion intempestive sont ainsi minimisés. L'usage d'une faible pression permet aussi d'apporter beaucoup d'eau et d'éviter les échauffements dus à la coupe, ainsi que le phénomène d'étincellage.This circular cutting device developed with several guns, placed at distances from the cutting head axis, has the advantage of reducing the cutting cycle time and performing a total cut, without residual attachment, with the maximum guarantee.
The abrasive water jet circular cutting device has the advantage of being a device requiring a lower energy source than for other devices. The principle of performing abrasive mixing directly in the head also has the advantage of reducing the wear of the components, and increasing their longevity, and gives greater efficiency to drilling and cutting.
Another advantage lies in the use of a low pressure, less than or equal to 200 bars. The use of such a pressure eliminates the vibrations induced on the explosive device and also reduces the total thrust force to less than 1 daN on the entire machine treated. The risks of movement and untimely explosion are thus minimized. The use of a low pressure also makes it possible to bring a lot of water and to avoid overheating due to cutting, as well as the phenomenon of sparkling.

D'autres caractéristiques et avantages de l'invention apparaîtront dans la description détaillée, non limitative, ci-dessous.Other features and advantages of the invention will appear in the detailed description, not limiting, below.

Cette description sera faite en regard des dessins annexés parmi lesquels :

  • la figure 1 représente schématiquement un mode de réalisation donné à titre d'exemple, en l'occurrence un dispositif de coupe circulaire par jet d'eau abrasif avec un tête équipée de quatre canons,
  • la figure 2 représente une vue en détail d'un ensemble comprenant un canon, une chambre de mélange avec buse et une arrivée d'abrasif.
  • les figures 3a, 3b et 3c représentent le principe général de la coupe au jet d'eau abrasif avec déviation du jet et l'attache résultante,
  • la figure 4 représente le schéma selon l'invention d'une coupe circulaire continue.
This description will be made with reference to the appended drawings among which:
  • FIG. 1 diagrammatically represents an embodiment given by way of example, in this case an abrasive water jet circular cutting device with a head equipped with four guns,
  • Figure 2 shows a detail view of an assembly comprising a barrel, a mixing chamber with a nozzle and an abrasive inlet.
  • FIGS. 3a, 3b and 3c show the general principle of abrasive water jet cutting with deflection of the jet and the resulting fastener,
  • Figure 4 shows the diagram according to the invention of a continuous circular section.

La figure 1 est une présentation par l'axe vertical du dispositif de coupe circulaire par jet d'eau abrasif.
Ce dispositif est constitué d'une chambre de distribution d'eau (1) reliée à une arrivée d'eau sous pression inférieure à 200 bars (2) et, surmontée d'une vanne à pointeau (3). Cette vanne à pointeau est actionnée par une commande pneumatique, hydraulique ou électrique (4).
La chambre de distribution d'eau (1) est solidarisée à une chambre porte canon (5).
Cette chambre assure le montage des canons (6), équipés chacun d'eux d'une chambre de mélange avec buse (9) et d'une arrivée d'abrasif (7).
L'ensemble du dispositif de coupe est entraîné en rotation par un moto réducteur (8).
Sur la figure 2 est présenté une vue d'ensemble du système comprenant le canon (6), la chambre de mélange avec buse (9) et l'arrivée d'abrasif (7), ainsi que l'eau (10) permettant le montage sur la chambre porte canons (5).Figure 1 is a presentation by the vertical axis of the circular cutting device by abrasive water jet.
This device consists of a water distribution chamber (1) connected to a water inlet under pressure of less than 200 bar (2) and surmounted by a needle valve (3). This needle valve is actuated by pneumatic, hydraulic or electric control (4).
The water distribution chamber (1) is secured to a barrel chamber (5).
This chamber assembles the guns (6), each equipped with a mixing chamber with nozzle (9) and an abrasive inlet (7).
The entire cutting device is rotated by a gear motor (8).
FIG. 2 shows an overview of the system comprising the barrel (6), the mixing chamber with nozzle (9) and the abrasive inlet (7), as well as the water (10) allowing the mounting on the barrel chamber (5).

Le fonctionnement de la tête de coupe va maintenant être expliqué.The operation of the cutting head will now be explained.

L'eau amenée par l'alimentation (2) est admise dans la chambre de distribution (1) par un orifice libéré par la vanne à pointeau (3) actionnée par le système de commande (4). Cette eau arrive à une pression dynamique inférieure ou égale à 200 bars. L'écoulement de l'eau s'établit dans les chambres de mélange (9) et par effet venturi entraîne l'additif du type polymère ou abrasif venant sur chaque chambre de mélange par les arrivées (7). Cet additif est aspiré et mélangé à l'eau sous pression venant de la chambre de distribution (1). Le mélange eau/additif sous pression sort par les canons (6). L'opération de coupe circulaire peut commencer. Il s'agit dans un premier temps d'effectuer un trou de perçage. Une fois ce trou réalisé, la coupe circulaire peut commencer, par la rotation de la tête de coupe, commandée par le moto réducteur (8). Pour diminuer l'angle de rotation, et donc le temps de découpe, la tête présentée en figure 1 a été équipée de quatre canons.The water supplied by the feed (2) is admitted into the distribution chamber (1) through an orifice released by the needle valve (3) actuated by the control system (4). This water reaches a dynamic pressure less than or equal to 200 bars. The flow of water is established in the mixing chambers (9) and by venturi effect causes the additive of the polymer or abrasive type coming from each mixing chamber by the arrivals (7). This additive is sucked and mixed with pressurized water from the distribution chamber (1). The water / additive pressure mixture exits through the guns (6). The circular cutting operation can begin. It is a question first to make a hole of drilling. Once this hole is made, the circular cut can begin, by the rotation of the cutting head, controlled by the gear motor (8). To reduce the angle of rotation, and therefore the cutting time, the head shown in Figure 1 was equipped with four barrels.

De plus, une particularité de cette tête de coupe est la disposition de ces canons (6) sur la chambre porte canons (5) pour supprimer le phénomène d'attache résiduelle.In addition, a feature of this cutting head is the provision of these guns (6) on the guns chamber (5) to eliminate the phenomenon of residual attachment.

Ce phénomène présenté sur les figures 3a, 3b, 3c est le suivant :

  • En figure 3a, la découpe circulaire débute par le perçage d'un trou (11) au travers du corps traité (12). Dès que le jet du mélange eau abrasif (13) traverse la paroi, le mouvement de rotation de la tête de coupe débute.
    Ce mouvement de rotation associé à l'obstacle de la paroi occasionne une déviation du jet. La découpe ne se fait donc pas au droit, mais de biais, comme présente en figure 3b.
This phenomenon presented in FIGS. 3a, 3b, 3c is the following:
  • In Figure 3a, the circular cut starts with the drilling of a hole (11) through the treated body (12). As soon as the jet of the abrasive water mixture (13) passes through the wall, the rotational movement of the cutting head begins.
    This rotational movement associated with the obstacle of the wall causes a deviation of the jet. The cutting is not done right, but diagonally, as shown in Figure 3b.

En fin de coupe, figure 3 c, lorsque le jet du mélange eau abrasif revient au point de départ, il repasse dans le trou initial. Le biais est supprimé et le jet redevient droit. Avec ce fonctionnement, on laisse donc en arrière du trou de perçage une attache résiduelle (14) qui ne pourra être découpée.At the end of cutting, Figure 3 c, when the jet of the abrasive water mixture returns to the starting point, it goes back into the initial hole. The bias is removed and the jet becomes straight again. With this operation, we leave behind the hole of piercing a residual fastener (14) that can not be cut.

Pour résoudre ce phénomène et effectuer une découpe totale, il faut disposer d'un système permettant de terminer la coupe sans repasser par le trou de perçage initial et avec superposition partielle des trajectoires de découpe. On équipe la tête de plusieurs canons comme présenté en figure 1 en les décalant les uns par rapport aux autres.To solve this phenomenon and perform a total cut, it is necessary to have a system for finishing the cut without going back through the initial drilling hole and with partial superposition of the cutting paths. We equip the head of several guns as shown in Figure 1 by shifting them relative to each other.

Dans le cas présent, les quatres canons ont été disposés deux à deux à distance différente de l'axe de la tête de coupe. Cette différence de distance a pour valeur maximale l'épaisseur du trait de coupe provoqué par le jet d'eau abrasif. Ce décalage de deux des canons, par rapport aux deux autres associé à un angle de rotation de la tête de coupe de 100 degrés, permet d'effectuer une découpe circulaire telle que présentée en figure 4.In the present case, the four guns were arranged in pairs at a distance different from the axis of the cutting head. This difference in distance has as a maximum value the thickness of the cut line caused by the jet of abrasive water. This offset of two of the barrels, relative to the other two associated with a rotation angle of the cutting head of 100 degrees, allows a circular cut as shown in Figure 4.

Le jet de mélange eau abrasif ne repasse pas dans un trou de perçage initial et le prolongement de la rotation de la tête de coupe sur un angle supérieur à 90 degrés permet de garantir une découpe totale avec suppression de toute attache résiduelle.The abrasive water mixing jet does not pass back into an initial drilling hole and the prolongation of the rotation of the cutting head over an angle greater than 90 degrees ensures a complete cut with removal of any residual fastener.

Bien entendu, le cadre de protection est défini par les revendications annexées.Of course, the protective framework is defined by the appended claims.

Claims (8)

  1. Device for circular cutting by means of an abrasive jet of water, comprising a cutting head which is Equipped with at least two pipes (6), these pipes (6) being fitted at different distances from the axis of the cutting head, characterised in that these pipes have parallel axes and are disposed such that the difference in distance in the installation of the pipes relative to the axis of the cutting head has a value which is smaller than, or the same as, the thickness of the cutting line created by the abrasive jet of water (13).
  2. Device according to claim 1 for circular cutting by means of an abrasive jet of water, characterised in that the pipes (6) each comprise a mixing chamber with a nozzle (9) and an abrasive intake (7).
  3. Device according to claim 2 for circular cutting by means of an abrasive jet of water, characterised in that at comprises a pipe-holder chamber (5) which is surmounted by a distribution chamber (1).
  4. Device according to claim 3 for circular cutting by means of an abrasive jet of water, characterised in that the distribution chamber (1) is connected to a pressurised water intake (2).
  5. Device according to claim 4 for circular cutting by means of an abrasive jet of water, characterised in that the water intake (2) is set to a pressure of less than 200 bars.
  6. Device according to claim 4 or claim 5 for circular cutting by means of an abrasive jet of water, characterized in that distribution chamber (1) is surmounted by a needle gate (3).
  7. Device according to claim 6 for circular cutting by means of an abrasive jet of water, characterised in that the needle valve (3) is activated by a means of a command of the pneumatic, hydraulic or electric type.
  8. Device according to claim 7 for circular cutting by means of an abrasive jet of water, characterised in that it is rotated by a gear motor (8).
EP01400324A 2000-02-10 2001-02-09 Device for defusing explosive charges by low pressure water jet cutting Expired - Lifetime EP1123777B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0001626 2000-02-10
FR0001626A FR2804895B1 (en) 2000-02-10 2000-02-10 DEVICE FOR NEUTRALIZING EXPLOSIVE DEVICES BY LOW PRESSURE WATER JET

Publications (2)

Publication Number Publication Date
EP1123777A1 EP1123777A1 (en) 2001-08-16
EP1123777B1 true EP1123777B1 (en) 2006-11-02

Family

ID=8846827

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01400324A Expired - Lifetime EP1123777B1 (en) 2000-02-10 2001-02-09 Device for defusing explosive charges by low pressure water jet cutting

Country Status (4)

Country Link
EP (1) EP1123777B1 (en)
AT (1) ATE344119T1 (en)
DE (1) DE60124159D1 (en)
FR (1) FR2804895B1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2885547A1 (en) * 2005-05-10 2006-11-17 Saint Gobain Liquid fluid jet cutting method for e.g. glass, involves cutting solid material by utilizing fluid jets simultaneously, where jets are parallel and produced by set of nozzles that operate in simultaneous manner
CN108590691A (en) * 2018-05-31 2018-09-28 中国铁建重工集团有限公司 A kind of development machine and its Water jet sprayer
CN109454561A (en) * 2018-12-21 2019-03-12 兴化金孔雀实业发展有限公司 It is a kind of to remove rim charge device for zinc products processing
CN110281156A (en) * 2019-07-26 2019-09-27 南京大地水刀股份有限公司 A kind of high-pressure water and abrasive material rotate the rotary joint of transmission simultaneously

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4128703A1 (en) * 1991-08-29 1993-03-04 Dietmar Dr Ing Rath Universal deactivating method for munitions and explosives - using high pressure liq. jets, useful for munitions, discovered in decomposed state
DE9415720U1 (en) * 1994-09-29 1994-12-15 Mak System Gmbh, 24159 Kiel Device for surface treatment of welds
DE4440631C2 (en) * 1994-11-14 1998-07-09 Trumpf Gmbh & Co Method and processing machine for beam cutting workpieces using at least two cutting beams
EP0967183B1 (en) * 1998-06-25 2004-04-07 Heraeus Quarzglas GmbH & Co. KG Method of machining a quartz glass component

Also Published As

Publication number Publication date
EP1123777A1 (en) 2001-08-16
DE60124159D1 (en) 2006-12-14
FR2804895A1 (en) 2001-08-17
FR2804895B1 (en) 2002-08-02
ATE344119T1 (en) 2006-11-15

Similar Documents

Publication Publication Date Title
FR2751254A1 (en) DEVICE FOR REMOVING PROJECTED CHIPS FROM THE MACHINING HEAD OF A TOOL MACHINE
KR100706616B1 (en) Apparatus of repairing pipe and repairing method there of it
EP1123777B1 (en) Device for defusing explosive charges by low pressure water jet cutting
US7162943B1 (en) Cavitating explosively augmented water-jet mine cutter system
AU2003280253A1 (en) Ultrasonic waterjet apparatus
EP0480828A1 (en) Powder supply device for coating by laser beam treatment
CN102234976A (en) Spraying device for a construction machine and a method for operating a spraying device
JPS6036560B2 (en) Deposit removal equipment for heat exchangers, etc.
EP0505285B1 (en) Gun for cutting out metal blanks
EP1698850A1 (en) Structure of a module for an electric armour
WO2013178941A1 (en) Method for compacting anodic paints, including the collision of sandblasting jets
EP0893047B1 (en) Method and device for cutting vegetation
EP0659523A1 (en) Apparatus for sandblasting surfaces, which are not directly accessible
RU2128323C1 (en) Installation for hydrocutting and utilization of solid propellant charge
FR2712354A1 (en) Device for producing an air stream having a flattened shape in cross section.
SU1429947A3 (en) Method and apparatus for removing stuck deposits from heating surface of heat exchanger
FR2464780A1 (en) METHOD OF WELDING STUDS WITHOUT ENCRYPTING THE ADJACENT SURFACE AND APPARATUS FOR CARRYING OUT SAID METHOD
EP0647505A1 (en) Method and apparatus for the treatment of metallic workpieces, either coated or not
WO2003074961A3 (en) On-site land mine removal system
FR2754483A1 (en) APPARATUS FOR INCREASING THE MECHANICAL STRENGTH OF A SURFACE OF A METAL ELEMENT
JPH08218483A (en) Nozzle for removing foreign matter in pipe
CA2253676C (en) Process and device for cutting vegetation
EP0484236A1 (en) Method of spreading bitumen at low velocity, device used in such a method and machine comprising such a device
WO2024160521A1 (en) Two-phase fogging jet nozzle
WO2002030619A1 (en) Peening method and machine therefor

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: 20010312

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR

AX Request for extension of the european patent

Free format text: AL;LT;LV;MK;RO;SI

AKX Designation fees paid

Free format text: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR

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): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR

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 FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20061102

Ref country code: AT

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: 20061102

Ref country code: NL

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: 20061102

Ref country code: FI

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: 20061102

Ref country code: IE

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: 20061102

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

Free format text: NOT ENGLISH

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

Free format text: LANGUAGE OF EP DOCUMENT: FRENCH

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REF Corresponds to:

Ref document number: 60124159

Country of ref document: DE

Date of ref document: 20061214

Kind code of ref document: P

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

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: 20070202

Ref country code: DK

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: 20070202

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 FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20070203

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: 20070213

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20070228

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20070228

Ref country code: MC

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20070228

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: PT

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: 20070402

NLV1 Nl: lapsed or annulled due to failure to fulfill the requirements of art. 29p and 29m of the patents act
GBV Gb: ep patent (uk) treated as always having been void in accordance with gb section 77(7)/1977 [no translation filed]

Effective date: 20061102

REG Reference to a national code

Ref country code: IE

Ref legal event code: FD4D

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed

Effective date: 20070803

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

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: 20061102

BERE Be: lapsed

Owner name: BOURGOGNE HYDRO

Effective date: 20070228

Owner name: ETAT-FRANCAIS REPRESENTE PAR LE DELEGUE GENERAL P

Effective date: 20070228

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20070228

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GR

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: 20070203

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CY

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: 20061102

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20070209

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: TR

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: 20061102

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20121031

REG Reference to a national code

Ref country code: FR

Ref legal event code: RN

Effective date: 20121204

REG Reference to a national code

Ref country code: FR

Ref legal event code: FC

Effective date: 20121210

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: 20120229

PGRI Patent reinstated in contracting state [announced from national office to epo]

Ref country code: FR

Effective date: 20121226

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 15

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 16

REG Reference to a national code

Ref country code: FR

Ref legal event code: CA

Effective date: 20160414

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 17

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 18

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20180220

Year of fee payment: 18

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: 20190228