EP3880374B1 - Dispositif de nettoyage sans contact à courant tourbillonnaire - Google Patents

Dispositif de nettoyage sans contact à courant tourbillonnaire Download PDF

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Publication number
EP3880374B1
EP3880374B1 EP19798596.3A EP19798596A EP3880374B1 EP 3880374 B1 EP3880374 B1 EP 3880374B1 EP 19798596 A EP19798596 A EP 19798596A EP 3880374 B1 EP3880374 B1 EP 3880374B1
Authority
EP
European Patent Office
Prior art keywords
hollow body
workpiece
nozzle ring
cleaned
tube
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.)
Active
Application number
EP19798596.3A
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German (de)
English (en)
Other versions
EP3880374A1 (fr
Inventor
Mathias DÖRNBACH
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.)
Ejot SE and Co KG
Original Assignee
Ejot SE and Co KG
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.)
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Publication date
Application filed by Ejot SE and Co KG filed Critical Ejot SE and Co KG
Publication of EP3880374A1 publication Critical patent/EP3880374A1/fr
Application granted granted Critical
Publication of EP3880374B1 publication Critical patent/EP3880374B1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B5/00—Cleaning by methods involving the use of air flow or gas flow
    • B08B5/02—Cleaning by the force of jets, e.g. blowing-out cavities
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B5/00—Cleaning by methods involving the use of air flow or gas flow
    • B08B5/02—Cleaning by the force of jets, e.g. blowing-out cavities
    • B08B5/023—Cleaning travelling work
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B15/00—Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area
    • B08B15/04—Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area from a small area, e.g. a tool
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B5/00—Cleaning by methods involving the use of air flow or gas flow
    • B08B5/04—Cleaning by suction, with or without auxiliary action
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B6/00—Cleaning by electrostatic means

Definitions

  • the present invention relates to a non-contact cleaning device, in particular a cleaning device for removing adhering particles on a workpiece and a corresponding method.
  • the production conditions or the processing of the workpiece within the production process for example by milling or reaming the workpiece, repeatedly result in particles on the surface of the workpiece to be manufactured or processed drop. These particles not only cloud the appearance of a finished product, but can also be a hindrance for further processing steps, for example if the workpiece is to be painted etc. It is also conceivable that such fine workpieces are manufactured or processed in which the adhering Particles themselves are already hampering the functioning of the workpiece, for example when the workpiece forms part of precision mechanics.
  • the workpieces are therefore usually sprayed with compressed air so that the particles are blown off the surface.
  • compressed air spraying examples of devices suitable for such compressed air spraying are described in the documents EP 3 253 531 A1 , US 4,631,124A , DE 10 2004 031881 A1 and DE 10 2013 203491 A1 .
  • the object is therefore to provide a device and a method that do not have the disadvantages mentioned above and with which a simple, non-contact cleaning of a workpiece is possible without the need for complex and cost-intensive structures and which avoid contamination of the environment. Furthermore, the task is to provide a device that does not require compressed air.
  • a device for contact-free cleaning of a workpiece having a first hollow body which is adapted to at least partially accommodate the workpiece to be cleaned.
  • the hollow body encloses a defined space.
  • the hollow body can have at least one inlet opening which is dimensioned in such a way that the workpiece to be cleaned can be at least partially introduced into the hollow body through this opening.
  • the hollow body can also have a second inlet opening, which can also be referred to as an outlet opening.
  • This outlet opening can be adapted in such a way that it can be connected to a vacuum source so that a suction can be created between the inlet opening and the outlet opening. This suction leads to an air flow within the first hollow body.
  • a flow of the medium is generated in which the device according to the invention is used. If the device according to the invention is used, for example, in a protective gas atmosphere, a flow of the protective gas is generated. In general it can also be said that a flow of the medium is generated in which the device is used.
  • the device according to the invention also has a second hollow body which at least partially surrounds the first hollow body.
  • Both hollow bodies can have a common inlet or outlet opening.
  • the first and the second hollow body can form a coaxial tube, ie a tube within a tube, with the inner tube being formed by the first hollow body and the outer tube being formed by the second hollow body. It will be understood by those skilled in the art that even when speaking of tubes that said hollow body can have any geometry, so can be configured, for example, square or oval.
  • connection between the two hollow bodies in the form of a movable nozzle ring, which allows media to flow between the first hollow body and the second hollow body.
  • air can be blown into the first hollow body via the second hollow body and the nozzle ring. Due to the fact that the nozzle ring can move and is driven by a drive, for example, the air blown into the first hollow body is turbulent, so that a turbulent current is generated within the first hollow body. This eddy current allows an increased air flow to be applied to the workpiece to be cleaned.
  • the eddy current has the advantage that the air flow always hits the workpiece to be cleaned at different angles, which means that the adhering particles can be blown off better.
  • the particles detached in this way are sucked through the first hollow body in the direction of the vacuum source and thus do not get into the environment. Due to the eddy current generated, even a low pressure for the air flow is sufficient to achieve an increased cleaning effect.
  • the outlet opening of the first hollow body can be connected to an intake of a fan, whereas the inlet opening of the second hollow body can be connected to the outlet of the fan. Air is thus circulated between the first and second hollow bodies. It can also be said that the blower sucks air out of the first hollow body and blows it back into the hollow body via the second hollow body and the movable nozzle ring.
  • the device according to the invention thus has the advantage that a workpiece can be cleaned easily without contaminating the environment.
  • a further advantage of the device according to the invention is based on the fact that no compressed air has to be used to clean the workpiece, ie no oil or condensation separators are required, which are essential for compressed air cleaning.
  • the first hollow body has an ionizer, for example at its inlet opening, in order to also detach the particles statically adhering to the surface of the workpiece.
  • the ionizer can emit ions by means of connectable high voltage, which can at least partially ionize the air flowing past the ionizer or the medium flowing past. If this ionized air flow is directed onto the surface of the workpiece, the surface of the workpiece is electrostatically discharged and the statically adhering particles can be blown off.
  • the ionizer can have a plurality of ionization tips. These ionization tips can also be referred to as emitter tips and can be connected to a high-voltage source.
  • the ionization tips can, for example, be arranged circumferentially on or in the inlet opening of the first hollow body. Such an arrangement of ionization tips can also be referred to as an ionization crown or ionization ring. All ionization tips can emit ions with the same charge or different ionization tips can emit ions with different charges. This ensures that different surface charge profiles can be accommodated, i.e. due to the fact that ions of both polarities can be emitted, the static charge can be neutralized and the static adhesion of particles can be eliminated. In this case, for example, ionization tips emitting positive ions can be arranged alternating with ionization tips emitting negative ions. It is also possible, for example, for two ionization rings to be offset from one another, with one ionization ring in each case emitting ions of a specific polarity.
  • the nozzle ring has at least one nozzle.
  • This at least one nozzle can allow media to flow between the first and second hollow bodies. Due to the movement of the nozzle ring, the at least one nozzle does not remain stationary in one place, but changes its position over time.
  • the nozzle can also be designed so that its alignment is adjustable and changes, for example, during the movement of the nozzle ring.
  • the setting can change, for example, during a rotation of the nozzle ring.
  • the at least one nozzle can be changed in shape and size, so that the media flow can be adjusted in a targeted manner.
  • the media flow can be adapted, for example, to the geometry of the workpiece to be cleaned.
  • the workpiece can be scanned without contact and the at least one nozzle can be adjusted accordingly automatically in such a way that it generates an optimal media flow that matches the geometry of the workpiece.
  • the movement of the nozzle ring which can also be adapted to the shape and geometry of the workpiece.
  • the at least one nozzle and its adjustment mechanism can be adjusted in such a way that the at least one nozzle and a corresponding movement of the nozzle ring are automatically adjusted based on the insertion depth of the workpiece into the first hollow body .
  • a drive moves the movable nozzle ring.
  • This moving can be direct moving or indirect moving.
  • the drive can be coupled directly to the nozzle ring, so that the movement of the drive is transmitted directly to the nozzle ring, which moves in accordance with the movement of the drive.
  • the drive it is also possible for the drive to be coupled indirectly to the nozzle ring, for example with the aid of a transmission, a gear arrangement or a drive belt. In this case, the movement of the drive is not transmitted directly to the nozzle ring. This has the advantage that the drive can be arranged at a distance from the nozzle ring.
  • the movement of the drive is first transmitted to the transmission, the gear arrangement or the drive belt and then to the nozzle ring.
  • An electric motor or a pneumatic motor can be used as the drive.
  • the motor can also be part of the nozzle ring, for example. It is also conceivable that the motor is part of the first or second hollow body or is separate therefrom.
  • the drive can also be provided by the design of the nozzle ring itself, for example the nozzle ring can have lamellae, impellers or the like which set the nozzle ring in motion through the air flowing in via the first and/or second hollow body.
  • the first and/or the second hollow body has at least one filter.
  • This at least one filter can be arranged, for example, in or on the outlet opening of the first hollow body. This filter can absorb the blown-off particles so that they do not even get into the vacuum source connected to the outlet opening.
  • the at least one filter can be exchangeable.
  • the person skilled in the art is also aware that not only one filter can be used, but a plurality of filters which, for example, filter particles of different sizes.
  • at least one filter can also be arranged at the inlet opening of the second hollow body. This at least one filter can then prevent particles from getting into the air flow through the nozzle ring onto the workpiece to be cleaned.
  • This filter can also be exchangeable and consist of several filters.
  • the device also has a holding means for holding the workpiece to be cleaned.
  • this holding means can hold the workpiece in a specific position within the first hollow body. It is also possible for the holding means to hold the workpiece and move it at least partially in the first hollow body.
  • the holding means can, for example, also cause the workpiece to rotate within the first hollow body, so that the air flow can optimally flow around the entire surface of the workpiece and corresponding adhering particles are removed.
  • the first hollow body also has a limiting means which prevents the workpiece from being inserted too deeply into the hollow body or being sucked in by the vacuum source.
  • the hollow body has a grid on the inside, which is designed in such a way that it holds back the workpiece if it is sucked in by the vacuum source.
  • the workpiece to be cleaned is introduced into the first hollow body and moves Through this.
  • the workpiece to be cleaned can either be positively guided by a means or move due to the force of gravity. In the latter case, it can also be said that the workpiece to be cleaned falls through the device and is cleaned as it falls.
  • the device has a further opening through which a further medium can be fed into the first hollow body.
  • This additional medium can differ, for example, from the medium that is sucked through the first hollow body.
  • This additional medium can be a cleaning medium, for example.
  • the device has at least one pressure sensor or air flow meter in the area of the inlet opening of the first hollow body, which is connected to a controller. Based on the measured values, the controller is able to control at least the vacuum source and, if present, the connected overpressure source and the movement of the nozzle ring.
  • a plurality of devices according to the invention can be arranged one behind the other in a cascade-like manner.
  • the devices can either be arranged directly one behind the other, i.e. the at least one outlet opening of a first hollow body of a first device is connected to an inlet opening of the first hollow body of the second device, etc., or the devices can be arranged at a distance from one another.
  • the workpiece to be cleaned can be moved or fall through all the devices arranged one behind the other, so that different degrees of contamination can be removed.
  • the above-mentioned object is also achieved by a method according to the invention for contact-free cleaning of a workpiece.
  • the method according to the invention comprises at least partially inserting the workpiece to be cleaned into a first hollow body via a first inlet opening of the first hollow body, generating an air flow in the first hollow body by blowing air into the first hollow body via a movable nozzle ring, the movable nozzle ring is arranged between the first hollow body and a second hollow body, wherein the second hollow body at least partially surrounds the first hollow body and simultaneous movement of the nozzle ring.
  • the method further includes emitting ions into the air flow.
  • the method further includes moving the workpiece to be cleaned in the generated air flow.
  • This movement of the workpiece can be accomplished, for example, by a holding device which rotates the workpiece to be cleaned inside the first hollow body so that the air flow can optimally flow around the workpiece and the particles adhering to the surface can be blown off.
  • the workpiece to be cleaned can, for example, also be moved through the device, i.e. from the inlet opening of the first hollow body to an outlet opening of the first hollow body.
  • the method further includes the removal of the workpiece from the first hollow body after the cleaning process has ended. This means that the workpiece is removed from the first hollow body again through the entry opening from which it was introduced. This has the advantage that the workpiece is not moved in the direction of the blown-off particles, so that there is no risk of renewed contamination.
  • FIG 1 shows an exemplary embodiment of a device 1 according to the invention.
  • the device 1 has a coaxial tubular structure. Ie the device 1 consists of an inner tube 2 - which represents a first hollow body - which has an inlet opening 2a and an outlet opening 2b. The medium can flow between the first opening 2a and the second opening 2b.
  • the device 1 also has a second tube 3—which represents a second hollow body—which at least partially surrounds the first tube 2 . It can also be said that the first tube 2 is the inner tube or the inner hollow body and the second tube is the outer tube or the outer hollow body.
  • the second tube 3 has an inlet opening 3a and is connected to the first tube 2 on the inside in the exemplary embodiment shown here, so that the media can flow between the inlet opening 3a of the second tube 3 and the first tube 2 .
  • the blow-out of a blower can be connected to the opening 3a, so that a medium can be blown from the outer tube 3 into the inner tube 2, resulting in a medium flow within the first tube 2 from its inlet opening 2a to its outlet opening 2b.
  • a negative pressure source can then be connected to the outlet opening 2b of the first tube 2, which additionally sucks air out of the interior of the first tube 2.
  • the negative pressure source can be, for example, the intake of the fan, with which air is blown into the first tube 2 via the inlet opening 3a of the second tube 3 .
  • the media flow within the first tube 2 has the effect that when a workpiece to be cleaned is moved through the inlet opening 2a into the tube 2, this workpiece is surrounded by the generated media stream.
  • adhering particles are blown off and move in the direction of the outlet opening 2b of the first tube 2, where these particles, for example, through a filter - can be added - not shown here.
  • a movable nozzle ring (not shown here—is arranged between the connection of the first tube 2 and the second tube 3 .
  • This directs the air blown into the second tube 3 into the first tube 2 via at least one nozzle, whereby the movement of the nozzle ring when the air is blown in creates a turbulent flow, which not only increases the suction effect in the first tube 2, but also ensures it that the air flow hits the workpiece to be cleaned at different angles.
  • the nozzle ring is moved via a drive 6.
  • an ionizer - not shown here - can be arranged in or on the inlet opening 2a, which emits ions by means of high voltage, which lead to the neutralization of the surface charge of the workpiece, so that the otherwise statically adhering particles can be blown off.
  • figure 2 shows a vertical section through the in figure 1 shown exemplary embodiment of the device 1 according to the invention.
  • the inner tube 2 is at least partially surrounded by the outer tube 3 .
  • a nozzle ring 4 is arranged between the first and second pipe 2, 3 and has at least one nozzle 7 in the exemplary embodiment shown here. If, for example, a blower is connected to the inlet opening 3a of the outer tube 3, air is blown through the nozzle 7. There is thus a flow of media between the nozzle 7 and the inner tube 2.
  • the medium is also sucked in by this flow of media through the inlet opening 2a, so that a flow of media arises between the inlet opening 2a and the outlet opening 2b.
  • the inlet opening 2a is funnel-shaped in order to promote the media flow.
  • a vacuum source can also be connected to the outlet opening 2b. Due to the movement of the nozzle ring 4, which in the embodiment shown here represents a boundary between the cavity of the first tube 2 and the cavity of the second tube 3 and separates them from one another, air can only flow through the at least one nozzle 7 between the second tube 3 and the first tube 2 flow.
  • the nozzle ring 4 can be coated with a material that has a low coefficient of friction, so that the friction between the nozzle ring 4 and the first and second tubes 2, 3 is as low as possible. It is also conceivable that only at the contact points between the nozzle ring 4 and the first and second tube 2, 3 the nozzle ring 4 and/or the first and second tube 2, 3 is coated with a material which has a low coefficient of friction.
  • the nozzle ring 4 is moved by means of a drive 6 which is connected to the nozzle ring 4 via a gear arrangement 8 .
  • the nozzle ring 4 has on its outside, ie on the side facing the second pipe 3 , a gear rim which is brought into contact with gears of the gear arrangement 8 which in turn are connected to a gear of the drive 6 .
  • the gear arrangement 8 acts as a gear between the drive 6 and the nozzle ring 4, so that the speed of the nozzle ring 4 is higher than the speed of the drive 6.
  • the person skilled in the art is aware that the example of the transmission of movement from drive 6 to nozzle ring 4 described here is only an example and other transmissions of movement are also included.
  • a drive belt to extend around the nozzle ring 4, which is moved by the drive 6.
  • the drive 6 itself to be part of the nozzle ring 4 .
  • the nozzle ring 4 can also have lamellae or vanes which ensure that the nozzle ring 4 is set in motion by the air blown into the inlet opening 3a of the second tube 3 .
  • the device 1 has ionization tips 5a, 5b, 5c, which form an ionizer 5, circumferentially at the inlet opening 2a of the first tube 2.
  • the ionizer 5 can be connected to a high-voltage source via a connection 9 .
  • the high voltage generates ions at the ionization tips 5a, 5b, 5c, which are able to neutralize the static charging of the workpiece.
  • Emitted ions are carried along by the media flow generated into the inner tube 2 and can hit the workpiece to be inserted there, where the corresponding neutralization takes place.
  • figure 3 shows a 3D view of the in figure 2 shown vertical section through the in figure 1 shown embodiment of the device according to the invention.
  • the outlet opening 2b of the inner tube 2 and the inlet opening 3a of the outer tube 3 are each provided with threads in order to connect vacuum and positive pressure sources to the respective openings.

Landscapes

  • Cleaning In General (AREA)
  • Cleaning By Liquid Or Steam (AREA)
  • Elimination Of Static Electricity (AREA)

Claims (15)

  1. Un dispositif (1) de nettoyage sans contact d'une pièce, le dispositif (1) comprenant :
    un premier corps creux (2), le premier corps creux (2) étant adapté pour recevoir au moins en partie la pièce à nettoyer ;
    un deuxième corps creux (3), le deuxième corps creux (3) entourant au moins en partie le premier corps creux (2) ; et
    une bague à buse déplaçable (4) entre le premier corps creux (2) et le deuxième corps creux (3) pour un flux d'agent entre le premier corps creux (2) et le deuxième corps creux (3), la bague à buse (4) étant déplaçable au moyen d'un entraînement (6).
  2. Le dispositif (1) selon la revendication 1, dans lequel le premier corps creux (2) comporte au moins un ioniseur (5) .
  3. Le dispositif (1) selon la revendication 2, dans lequel l'ioniseur (5) comporte une pluralité de pointes d'ionisation (5a, 5b, 5c) qui sont disposées en périphérie dans une ouverture d'entrée (2a) du premier corps creux (2).
  4. Le dispositif (1) selon la revendication 3, dans lequel les pointes d'ionisation (5a, 5b, 5c) sont adaptées pour émettre des ions différemment chargés.
  5. Le dispositif (1) selon une des revendications précédentes, comprenant en outre :
    une source de haute tension reliée à l'ioniseur (5).
  6. Le dispositif (1) selon une des revendications précédentes, dans lequel le premier corps creux (2) est adapté pour être relié à une source de dépression.
  7. Le dispositif (1) selon une des revendications précédentes, dans lequel le deuxième corps creux (3) est adapté pour être relié à une source de surpression ou à une source de dépression.
  8. Le dispositif (1) selon une des revendications précédentes, dans lequel la bague à buse (4) comporte au moins une buse (6) pour commander le flux d'agent entre le premier corps creux (2) et le deuxième corps creux (3).
  9. Le dispositif (1) selon une des revendications précédentes, dans lequel le dispositif (1) comporte en outre :
    un entraînement (6) pour déplacer la bague à buse (4).
  10. Le dispositif (1) selon la revendication 9, dans lequel l'entraînement (6) est un moteur électrique ou un moteur pneumatique.
  11. Le dispositif (1) selon une des revendications précédentes, dans lequel le premier corps creux (2) et/ou le deuxième corps creux (3) comportent au moins un filtre.
  12. Le dispositif (1) selon une des revendications précédentes, comprenant en outre :
    un moyen de retenue pour retenir la pièce à nettoyer.
  13. Un procédé de nettoyage sans contact d'une pièce, le procédé comprenant :
    l'introduction au moins partielle de la pièce à nettoyer dans un premier corps creux (1) à travers une première ouverture d'entrée (2a) du premier corps creux (2) ;
    la production d'un courant d'air dans le premier corps creux (2) par insufflation d'air par l'intermédiaire d'une bague à buse déplaçable (4) dans le premier corps creux (2), la bague à buse déplaçable (4) étant disposée entre le premier corps creux (2) et un deuxième corps creux (3), le deuxième corps creux (3) entourant au moins en partie le premier corps creux (2) ; et
    le déplacement simultané de la bague à buse (4).
  14. Le procédé selon la revendication 13, comprenant en outre :
    l'émission d'ions dans le courant d'air.
  15. Le procédé selon la revendication 13, comprenant en outre :
    le déplacement de la pièce à nettoyer dans le courant d'air produit.
EP19798596.3A 2018-11-16 2019-11-04 Dispositif de nettoyage sans contact à courant tourbillonnaire Active EP3880374B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018219696.6A DE102018219696A1 (de) 2018-11-16 2018-11-16 Berührungsfreie Reinigungsvorrichtung mit Wirbelstrom
PCT/EP2019/080075 WO2020099163A1 (fr) 2018-11-16 2019-11-04 Dispositif de nettoyage sans contact à courant tourbillonnaire

Publications (2)

Publication Number Publication Date
EP3880374A1 EP3880374A1 (fr) 2021-09-22
EP3880374B1 true EP3880374B1 (fr) 2023-01-04

Family

ID=68470500

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19798596.3A Active EP3880374B1 (fr) 2018-11-16 2019-11-04 Dispositif de nettoyage sans contact à courant tourbillonnaire

Country Status (11)

Country Link
US (1) US20210308723A1 (fr)
EP (1) EP3880374B1 (fr)
JP (1) JP7137704B2 (fr)
KR (1) KR102400396B1 (fr)
CN (1) CN112996608B (fr)
BR (1) BR112021008762A2 (fr)
DE (1) DE102018219696A1 (fr)
ES (1) ES2941731T3 (fr)
MX (1) MX2021005753A (fr)
RU (1) RU2765225C1 (fr)
WO (1) WO2020099163A1 (fr)

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DE102018219696A1 (de) 2020-05-20
BR112021008762A2 (pt) 2021-08-10
MX2021005753A (es) 2021-08-11
JP7137704B2 (ja) 2022-09-14
JP2022506952A (ja) 2022-01-17
ES2941731T3 (es) 2023-05-25
KR102400396B1 (ko) 2022-05-20
CN112996608B (zh) 2022-05-13
EP3880374A1 (fr) 2021-09-22
WO2020099163A1 (fr) 2020-05-22
CN112996608A (zh) 2021-06-18
US20210308723A1 (en) 2021-10-07
KR20210080573A (ko) 2021-06-30
RU2765225C1 (ru) 2022-01-26

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