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EP0515412A1 - Procede et dispositif de nettoiement d'orifices pour l'elimination des impuretes visco-elastiques - Google Patents

Procede et dispositif de nettoiement d'orifices pour l'elimination des impuretes visco-elastiques

Info

Publication number
EP0515412A1
EP0515412A1 EP91903262A EP91903262A EP0515412A1 EP 0515412 A1 EP0515412 A1 EP 0515412A1 EP 91903262 A EP91903262 A EP 91903262A EP 91903262 A EP91903262 A EP 91903262A EP 0515412 A1 EP0515412 A1 EP 0515412A1
Authority
EP
European Patent Office
Prior art keywords
liquid
rubber
nozzle
holes
cleaned
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.)
Withdrawn
Application number
EP91903262A
Other languages
German (de)
English (en)
Inventor
Heinz Jürgen SCHWARZE
Robert Kopp
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.)
Continental AG
Original Assignee
Continental AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Continental AG filed Critical Continental AG
Publication of EP0515412A1 publication Critical patent/EP0515412A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
    • B08B3/02—Cleaning by the force of jets or sprays
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/27—Cleaning; Purging; Avoiding contamination
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B2220/00—Type of materials or objects being removed
    • B08B2220/04—Polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion

Definitions

  • the invention relates to a method for cleaning holes whose depth is greater than their diameter, in particular of the holes in St rainer plates of sticky, grafted rubber residues, the rubber being pushed out in one direction substantially while maintaining its plug shape.
  • the particular difficulty lies in the fact that the holes, owing to their great depth, offer the sticky rubber a large adhesive wetting surface with only a small contact surface for the pressing tools.
  • the problem is further compounded by the fact that the rubber is much less rigid than the outer wall of the holes to be cleaned, which is usually made of steel. This leads to a steep drop in shear stress over the depth of the hole in the contact surface of the rubber hole outer wall.
  • the rubber is a very viscous liquid.
  • the increased rubber internal pressure acts - as in the case of a liquid - in the perforated surface - perpendicular to the force introduced by the tool.
  • the fatal is based on this Effect that the expulsion resistance is increased by using an expelling stamp.
  • the critical hole depth can be specified, from which a spontaneous pressing out of the rubber residues is no longer possible, because the effect increasing the resistance to stripping gains the upper hand. This critical hole depth is usually exceeded in the case of strainer plates, the cleaning of which is the primary concern of the invention. Common strainer plates have hole depths between 25 and 40 mm with inner hole diameters between 6 and 12 mm.
  • the plug-shaped rubber residues cannot be pressed out of deep holes as a rapid process step. At most, the rubber plugs can be moved to flow out of the deep holes very slowly. The time for this to flow out must be specified after hours or even days for the hole dimensions common on strainer plates and is therefore unsuitable for economical series production. Common strainer plates have about three to five hundred holes for the rubber to pass through.
  • the method made possible by this device is not suitable for expelling rubber residues due to the viscoelastic properties of the Chews because the liquid jet energy is essentially absorbed by damping. Only brittle or liquid-soluble materials can be driven out. - In addition, a hole is initially required so that the lance can be retracted at all; the method is therefore only suitable for enlarging the free cross section of holes but not for producing a free cross section at all.
  • DE-GH 88 06 774 describes a similar device with a lance, from which a pressure fluid jet is to emerge laterally.
  • the use of detergents is taught in order to overcome the problem of the insolubility of the contaminant to be expelled - there oils, fats and lubricants - in the liquid used.
  • the use of detergents is not recommended for the problem on which the invention is based, because the valuable commodity expelled is then no longer a usable raw material but rather special waste.
  • the hole wall must be cleaned of detergent. Otherwise, as with the aforementioned prior art, the lance cannot be inserted into the hole at all because the hole is completely blocked by rubber and is not just wetted with rubber on the hole wall.
  • Strainer plates have so far been cleaned by drilling. This allows you to clean a hole in just under ten seconds. In addition to the considerable wear on the drill, this method suffers in particular from the effort required to center the drill axis on the center of the hole, since the outer diameter of the drill has to be almost the same as the inner diameter of the holes to be cleaned in order to achieve an acceptable cutting performance to reach. If the centering was inadequate, the hole walls would also be subjected to a high abrasive load in addition to the drills. Because of the considerable positioning effort, it is hardly possible to clean several holes at the same time by drilling out rubber. For a strainer plate with, for example, 400 holes, cleaning after the boring process takes about an hour.
  • Another disadvantage of the boring process is that the personnel requirements are high.
  • the chip removal and cutting edge quality of the drill must be constantly checked, the drill must be unclamped, ground and re-clamped, and the drill cooling must be checked.
  • the invention is based on the object of specifying a less sensitive and, to a greater extent, automatable method for cleaning deep holes from rubber residues, in particular the holes from strainer plates.
  • the object is achieved in that the rubber residues are pressed out by a liquid jet, the liquid jet being accelerated by applying excess pressure in the liquid jet nozzle to such an extent that the speed v at which the liquid or liquid drop impinges on the rubber residues or . is greater than or equal to the speed of sound c of the rubber to be expelled.
  • the diameter D F of the liquid jet is advantageously matched to the inside diameter D. of the holes to be cleaned in such a way that D_ is 1.0 to 1.5 times D. The wider the jet, the smaller the Precision requirements for beam centering on the center of the hole.
  • the diameter D F of the liquid jet is understood to mean the diameter of the liquid jet cross section through which 95% of the total liquid volume passes.
  • the impact speed should be at least as great as the product of the speed of sound c in the rubber to be expelled times the density ratio J * •. / * _.
  • Radiation source is in the present case, the best effect only with a considerable distance between the strainer plate to be cleaned and the
  • Nozzle diameter D. of 1.3 mm was the optimum
  • the distance must be increased and vice versa.
  • the surprisingly simple measure of the spacing exactly achieves the beam scatter that the entire hole cross section is recorded at the point of impact.
  • the rubber to be expelled apparently does not have a continuous stream of liquid but a salvo of discrete water drops.
  • An apparatus for performing the method according to the invention comprises a high-pressure liquid pump and a liquid nozzle.
  • an actuating valve is present behind the high-pressure pump, which allows the jet to be blocked when the nozzle is moved to the next hole, and between the pump and the valve there is a - preferably pneumatically acting - pressure accumulator.
  • Such a device is shown as an exemplary embodiment in the figure:
  • the cleaning device shown uses water as a cleaning liquid without any cleaning additives, via the feed water line 1, the two-cylinder high-pressure water pump 2, which is driven by a motor 3, sucks in water and conducts it under high pressure into the pressurized water line 4.
  • the pressurized water line 4 opens a check valve 16 in a pneumatic accumulator, in the lower area of which there is pressurized water and above which pressurized air, via the fresh air supply 6, the air pump 7, which is driven by a motor 8, the pressurized air line 9 and the non-return air valve i L 10, a pressure air cushion 11 is built up in the upper region of the pneumatic accumulator 5.
  • the pressure of this compressed air cushion is measured via a manometer 12, after which the motor 8 of the air pump 7 is regulated so that the air pressure in the compressed air cushion 11 is essentially constant over time.
  • the motor 3 of the high-pressure water pump 2 is regulated according to the water level in the store 5.
  • a pressure relief valve 13 is located at the upper end of the pneumatic accumulator 5.
  • a pressurized water line 14 leads to the shut-off valve 15, which can be operated via a lever 17.
  • the shut-off valve 15 is followed by a suction valve F latter valve 18, which, when the valve 15 is shut off, but because of its inertia, still allows water to flow into the hose line 20 up to the calibrated nozzle 21 into the hose line 20, so that the rest is still in Hose 20 existing water can escape essentially without delay.
  • the flutter valve L closes the air supply.
  • the length of the hose 20 serves as an acceleration section for the water column before it enters the calibrated nozzle 21. For this purpose, depending on the flow cross section upstream of the calibrated nozzle 21 and depending on the pressure in the pneumatic accumulator 5, a certain line length between the shut-off valve 15 and the calibrated nozzle 21 is required.
  • the flexible hose 20 is flanged via a hose coupling 19 to the secondary suction valve L 18, which in turn is flanged to the shut-off valve 15.
  • the elasticity of the hose 20 results in a fine smoothing over time of the pressure on the entire high-pressure side of the device.
  • the flexibility of the hose 20 is also used to enable a feed movement with a substantially rigid arrangement of the parts 1 to 19 and rotatable mounting of the Str ⁇ nerplatte 23 to be cleaned with its rubber-blocked holes 22 of the calibrated nozzle, so that successively all individual holes 22 of the St rai nerplatte 23 can be cleaned.
  • the feed device is not shown in this overview sketch.
  • the flow cross section of approximately 16 mm in the hose 20 is constricted in the calibrated nozzle 21 to a diameter D of 1.3 mm. This leads to a strong acceleration of the water droplets in the water jet 27. The cleaning effect of the water jet 27 is not disturbed by the fact that this water jet unites one contains considerable amounts of entrained air.
  • the water pressure on the high-pressure side of the device is 180 bar in this exemplary embodiment.
  • the largely relaxed water jet 27 is collected in a wastewater funnel 24 and fed to a sieve 25, where the brittle rubber that has been knocked out and does not dissolve in the water is separated out. After intermediate drying, these rubber residues can be fed back to fresh rubber mixtures.
  • the wastewater freed from rubber residues is in turn used as feed water for the high-pressure pump 2 and is only added to the small extent as water is lost through evaporation and fog formation via the fresh water supply 26. It is essentially a closed water cycle and rubber cycle.
  • the method according to the invention only needs about a tenth of the time to clean a strainer plate that was required after the boring process.
  • the method according to the invention can be automated particularly easily because the flexible nozzle 20 allows the water nozzle 21 to be delivered more easily than a boring machine and because the nozzle only has to be calibrated much less frequently when the drills had to be reground during the boring process;
  • there is an extended service life of the strainer plates because the edges of the holes 22 to be cleaned are only subjected to a smaller abrasive load during cleaning.
  • the increased capital expenditure for a device according to the invention for realizing the method according to the invention is quickly amortized by reduced running costs.
  • the invention initially aimed only to remove rubber residues from holes whose depth is at least twice as large as their diameter, the invention also permits the cleaning of such holes from other substances which are similarly sticky, elastic and viscous.
  • the only thing that is decisive is that the problems arising from the viscous load i zi tat are overcome by the fact that the material to be driven out can no longer avoid the tool that is being driven out, since it strikes at supersonic speed according to the invention.
  • Even when cleaning holes in thermoplastic elastomers the equivalent problem arises with an equivalent solution; the speed of sound in thermoplastic elastomers is sufficiently low to sufficiently exceed them with a water droplet jet.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Cleaning By Liquid Or Steam (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)

Abstract

L'invention se rapporte à un procédé et un dispositif pour le nettoiement des orifices profonds en vue de la suppression des résidus caoutchoutés visco-élastiques. L'outil nettoyant proposé est un jet de gouttelettes de liquide. L'écoulement du liquide est accéléré par une pompe haute pression et une buse étroite jusqu'à une vitesse supérieure à la vitesse du son dans le produit à éliminer. La distance entre la buse et l'orifice à nettoyer est réglée à une valeur d'autant plus grande que la section de la buse est faible par rapport à celle de l'orifice à nettoyer.
EP91903262A 1990-02-16 1991-02-07 Procede et dispositif de nettoiement d'orifices pour l'elimination des impuretes visco-elastiques Withdrawn EP0515412A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4004837A DE4004837C1 (fr) 1990-02-16 1990-02-16
DE4004837 1990-02-16

Publications (1)

Publication Number Publication Date
EP0515412A1 true EP0515412A1 (fr) 1992-12-02

Family

ID=6400293

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91903262A Withdrawn EP0515412A1 (fr) 1990-02-16 1991-02-07 Procede et dispositif de nettoiement d'orifices pour l'elimination des impuretes visco-elastiques

Country Status (6)

Country Link
US (1) US5366562A (fr)
EP (1) EP0515412A1 (fr)
JP (1) JPH05504108A (fr)
AU (1) AU7211891A (fr)
DE (1) DE4004837C1 (fr)
WO (1) WO1991012124A1 (fr)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4302415C1 (de) * 1993-01-28 1993-12-09 Christ Caroline Verfahren und Vorrichtung zum Reinigen von Teilen von Kunststoffverarbeitungsmaschinen
JPH06285868A (ja) * 1993-03-30 1994-10-11 Bridgestone Corp 加硫金型の清浄方法
US5730806A (en) * 1993-08-30 1998-03-24 The United States Of America As Represented By The Administrator Of The National Aeronautics & Space Administration Gas-liquid supersonic cleaning and cleaning verification spray system
JP3415670B2 (ja) * 1994-03-03 2003-06-09 三菱電機株式会社 ウエハ洗浄装置
US5706842A (en) * 1995-03-29 1998-01-13 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Balanced rotating spray tank and pipe cleaning and cleanliness verification system
US5699817A (en) * 1995-05-11 1997-12-23 Graco Inc Turbulent flow conduit cleaning apparatus
DE19534521C1 (de) * 1995-09-06 1996-11-21 Atotech Deutschland Gmbh Verfahren und Vorrichtung zum Behandeln von sich in Werkstücke erstreckende Löcher oder Vertiefungen mit flüssigen Behandlungsmitteln und Anwendung des Verfahrens zur Behandlung von Leiterplatten
DE19604490A1 (de) * 1996-02-08 1997-09-04 Kiwa France S A R L Vorrichtung zum Spülen von Gegenständen
US5609171A (en) * 1996-02-13 1997-03-11 Kuo; Fu-Chin Lipstick molding mold cleaning apparatus
US6505526B2 (en) * 2000-12-14 2003-01-14 General Electric Company Fluid flow inspection apparatus and method for gas turbine buckets
GB0116023D0 (en) * 2001-06-29 2001-08-22 Rospen Ind Ltd Extrusion apparatus and method of operation
DE10316644A1 (de) * 2003-04-11 2004-10-28 Robert Bosch Gmbh Niederdruckspritzmodul und Verfahren zur Niederdruckspritzreinigung mit Restschmutzanlyse von Bauteilen
CN106583315B (zh) * 2016-12-30 2023-04-18 东莞智富五金制品有限公司 一种细孔清洁装置及清洁方法

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3799173A (en) * 1972-03-24 1974-03-26 J Kamen Tracheal tubes
US3799178A (en) * 1972-10-30 1974-03-26 Corning Glass Works Extrusion die cleaning apparatus
DE2651885A1 (de) * 1976-11-13 1978-05-18 Kaercher Fa Alfred Tragbares hochdruckreinigungsgeraet
DE2948201C2 (de) * 1979-11-30 1985-09-26 Degussa Ag, 6000 Frankfurt Vorrichtung und Verfahren zum periodischen Abreinigen von Wärmeaustauscherrohren von Feststoffablagerungen und Verwendung dieser Vorrichtung
US4474251A (en) * 1980-12-12 1984-10-02 Hydronautics, Incorporated Enhancing liquid jet erosion
DE3335467A1 (de) * 1983-09-30 1985-04-25 Woma-Apparatebau Wolfgang Maasberg & Co Gmbh, 4100 Duisburg Vorrichtung zum entzundern, reinigen od. dgl. von bohrungen, rohren od. dgl.
JPS6238257A (ja) * 1985-08-09 1987-02-19 R D Kosan Kk 超高圧水噴射装置
US4899697A (en) * 1988-04-19 1990-02-13 Westinghouse Electric Corp. Pressure pulse cleaning apparatus
DE8806774U1 (de) * 1988-05-25 1988-07-07 S + B Schätzle + Bergmann GmbH, 8759 Hösbach Waschvorrichtung für Werkstücke

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9112124A1 *

Also Published As

Publication number Publication date
DE4004837C1 (fr) 1991-07-11
US5366562A (en) 1994-11-22
AU7211891A (en) 1991-09-03
WO1991012124A1 (fr) 1991-08-22
JPH05504108A (ja) 1993-07-01

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