EP0627268A2 - Dispositif de pulvérisation de liquide, en particulier pour les machines à imprimer - Google Patents

Dispositif de pulvérisation de liquide, en particulier pour les machines à imprimer Download PDF

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Publication number
EP0627268A2
EP0627268A2 EP94102871A EP94102871A EP0627268A2 EP 0627268 A2 EP0627268 A2 EP 0627268A2 EP 94102871 A EP94102871 A EP 94102871A EP 94102871 A EP94102871 A EP 94102871A EP 0627268 A2 EP0627268 A2 EP 0627268A2
Authority
EP
European Patent Office
Prior art keywords
pressure
liquid
pump
valve
period
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP94102871A
Other languages
German (de)
English (en)
Other versions
EP0627268B1 (fr
EP0627268A3 (fr
Inventor
Herbert Stanka
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.)
Baldwin Grafotec GmbH
Original Assignee
Baldwin Gegenheimer GmbH
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 Baldwin Gegenheimer GmbH filed Critical Baldwin Gegenheimer GmbH
Publication of EP0627268A2 publication Critical patent/EP0627268A2/fr
Publication of EP0627268A3 publication Critical patent/EP0627268A3/fr
Application granted granted Critical
Publication of EP0627268B1 publication Critical patent/EP0627268B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F35/00—Cleaning arrangements or devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/02—Arrangements for controlling delivery; Arrangements for controlling the spray area for controlling time, or sequence, of delivery
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B9/00—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour
    • B05B9/03—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material
    • B05B9/04—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material with pressurised or compressible container; with pump
    • B05B9/0403—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material with pressurised or compressible container; with pump with pumps for liquids or other fluent material
    • B05B9/0413—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material with pressurised or compressible container; with pump with pumps for liquids or other fluent material with reciprocating pumps, e.g. membrane pump, piston pump, bellow pump
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2235/00—Cleaning
    • B41P2235/10—Cleaning characterised by the methods or devices
    • B41P2235/26—Spraying devices

Definitions

  • the invention relates to a liquid spray device, in particular for printing presses, in order to spray liquid onto a rotating printing press cylinder or onto a moving printing material in the printing press, according to the preamble of claim 1.
  • the invention is not limited to use in printing presses, but can be used wherever small amounts of liquid have to be distributed uniformly over a relatively large area and dripping or a concentrated liquid jet at the end of a spraying period when the spray jet collapses is avoided should.
  • a Concentrated or massive liquid jet as well as drops form individual moisture strips on an object moving transversely to the liquid flow. These are not desirable.
  • a liquid spray device according to the type specified in the preamble of claim 1 is known from DE-OS 28 26 135.
  • the liquid spray device serves as a blanket washing device for moistening the blanket of a blanket cylinder in a printing press. It contains piston pumps for supplying liquids to a nozzle bar and spring-loaded check valves, which are opened in the direction of flow towards the nozzle bar by the liquid pressure against the spring pressure.
  • the atomization of the liquids on the nozzle bar is not carried out by the delivery pressure of the piston pumps, but by a blast of compressed air, which pushes the liquid out of the nozzle bar after the piston pump in question has previously delivered a certain amount of liquid into the nozzle bar.
  • DE-OS 40 13 465 A1 shows a printing press with a printing plate cylinder, a blanket cylinder, an impression cylinder, an inking unit and a dampening unit.
  • the liquid spray device of the present invention is suitable for spraying liquid, for example, onto such printing plate cylinders, blanket cylinders, impression cylinders, rollers and rollers of inking units and dampening units of a printing press, and also for moistening the printing material printed in such a printing press.
  • the liquid can be, for example, water, liquid detergent, solvents or mixtures thereof. With this, for example, the cylinders mentioned can be cleaned of ink and printing fibers.
  • the object of the invention is to avoid dripping and collapse of the spray jet to form a massive liquid jet and the moisture strips produced thereby on a sprayed object at the end of a spraying period.
  • spray period denotes a predetermined, preferably adjustable time period during which a liquid stream is atomized to form a spray jet consisting of mist-like or cloud-like small spray droplets.
  • the delivery of the liquid is switched off or the relevant liquid pressure line is blocked by the invention, and the liquid pressure line is relieved of pressure via a pressure relief line directly at the end of the spraying period or preferably shortly before the end of the spraying period.
  • the pressure relief line has a much larger flow cross-section in relation to a nozzle opening.
  • the pressure relief line not only supports the pressure reduction, which also takes place via the nozzle or the nozzles of the spray device, but the pressure relief line builds due to its large size Opening cross section the pressure also much faster than would be possible by one or more nozzles of the spray device alone.
  • the supply of liquid to the pressure line is preferably stopped immediately at the end of the spraying period, either by switching off or switching a pump or by a controlled "open” - “closed” valve at an inlet end of the pressure line. In another embodiment, the supply of liquid can be stopped shortly before the end of the spraying period.
  • the pressure relief valve is preferably opened a short time before the end of the spraying period, for example 1 s or a few 1/10 s beforehand, and then kept open for a period of time extending beyond the spraying period.
  • the part of the relaxation time before the end of the spraying period must be so short that the liquid pressure in the pressure line is sufficient until the end of the spraying period to atomize the liquid at the nozzle device in the form of a spray or a spray cloud into fine spray droplets.
  • the pressure relief valve is kept closed during the spraying period until approximately 0.2 s before the end of the spraying period, then opened, and is kept open for 0.8 s after the end of the spraying period, and only then closed, so that a total relaxation time of results in approximately 1 s.
  • a total relaxation time of results in approximately 1 s are preferred fair values. It is essential that the pressure relief valve is opened before the end of the spraying period, but only so shortly beforehand that the liquid is sufficient until the end of the spraying period is atomized. After the spraying period has elapsed, no more liquid is allowed to emerge from the spraying device, neither in the form of drops falling down, nor in the form of a solid or atomized liquid jet.
  • the pressure relief valve is closed again shortly after the relevant spray period in the manner described above. During longer breaks, e.g. several hours, but preferably the pressure relief valve is kept open until shortly before the beginning or until the start of the next spraying period and only then closed. The open pressure relief valve releases liquid pressures and thereby prevents liquid from being pressed out of the pressure line through the nozzle device when the temperature changes. Temperature changes can lead to different volume changes of the liquid and its lines, through which the liquid can be pressed out of the lines.
  • the liquid spray device shown in Fig. 1 is used for spraying liquid 4 such as water, solvent, liquid detergent or mixtures thereof onto printing press cylinders, such as blanket cylinders, printing plate cylinders or impression cylinders or other rotating cylinders, rolls or rollers, or onto running substrates wash, clean or lightly moisten them.
  • liquid 4 such as water, solvent, liquid detergent or mixtures thereof
  • printing press cylinders such as blanket cylinders, printing plate cylinders or impression cylinders or other rotating cylinders, rolls or rollers, or onto running substrates wash, clean or lightly moisten them.
  • the downstream end 30 of the pressure relief line 26 opens into the container 2 above the level of the liquid 4.
  • the check valve 14 in the suction line 12 is referred to below as the suction line valve. It is opened by the suction force of the pump 6 against the force of a valve spring 15 in the direction of flow to the pump 6 and closed by the valve spring 15 when the suction force ceases.
  • the check valve 24 in the pressure line 22 is referred to below as the pressure line valve. It is opened by the liquid pressure of the pump 6 in the direction of flow away from the pump 6 in the direction of the nozzle device 16 and is closed by the valve spring 25 when the liquid pressure drops below a certain value. As a result, the suction line valve 14 is open and the pressure line valve 24 is closed during the suction stroke of the pump 6; during the pressure stroke of the pump 6, the suction line valve 14 is closed and the pressure line valve 24 is open.
  • the suction stroke and the pressure stroke of the pump 6 carried out during a spraying period are of the same size. Due to the size of the suction stroke, the amount of liquid is "metered" into the pump 6, which during a subsequent pressure stroke is sprayed by the pressure of the pump 6 from the nozzle device 16. In one embodiment of the invention, the amount of liquid is, for example, 40 ml.
  • the pump 6 thus acts as a metering pump.
  • the nozzle device 16 contains a spring-loaded check valve 34 immediately upstream of one or more spray nozzles 32 which generate the spray jet (s) 18. This is referred to below as the nozzle valve 34. It opens in the direction of flow of the spray jet 18 and is urged in the opposite direction by a valve spring 35 in the closed position. The force of this valve spring 35 of the nozzle valve 34 is so great that it closes the nozzle valve 34 when the pressure of the liquid in the pressure line 22 is not sufficient to atomize the liquid at the nozzles 32.
  • the nozzle valve 34 has two functions: the closing pressure of the valve spring 35 is so great that liquid cannot leak out even at low liquid pressures, for example less than 0.4 bar, which are far below the liquid atomization pressure.
  • the closed nozzle valve 34 also prevents the liquid from running back and thus emptying the pressure line 22 through the pressure relief valve 28 even when the pressure relief valve 28 is open for a long time. At the closed nozzle valve 34, because the air cannot enter, a liquid holding suction is formed.
  • the valve 28 in the pressure relief line 26 is referred to below as a pressure relief valve 28. It is controlled by a control device 38 in such a way that it is closed from the beginning of the spraying period until shortly before the end of the spraying period, and is then open until beyond the end of the spraying period.
  • the distance of the suction stroke is variably adjustable. Since the suction stroke quantity corresponds essentially to the subsequent pressure stroke quantity, the amount of liquid which is sprayed during the pressure stroke is adjusted or metered by the adjustment of the suction stroke.
  • the pressure stroke duration is also identical and at the same time as the spraying period. So that the pump 6 can drive the liquid with the pressure required for atomization to the nozzle device 16 and through the nozzles 32 in the form of a spray jet 18 during the spraying period, the pressure relief valve 28 must at least from the beginning of the spraying period to the end or at least until shortly before Be closed at the end of the spraying period.
  • the pressure relief valve 28 is opened so shortly before the end of the spraying period that the liquid pressure generated in the pressure line 22 and the nozzle device 16 by the pump 6 is sufficient until the end of the spraying period to allow the liquid 4 in the form of a spray jet 18 atomize.
  • the pressure relief valve 28 is opened approximately 0.1 to 0.3 s before the end of the spraying period and then approximately Keep open for 0.8 s beyond the spraying period, resulting in a total liquid pressure relaxation time of approximately 1 s. After the spraying period has expired, the pressure relief valve 28 can also remain open longer. It must be closed again at the beginning of the next spray period at the latest. The end of the spraying period coincides with the reaching of the pressure stroke end of the pump 6.
  • the timing of the opening and closing of the pressure relief valve 28 is carried out by an electronic control device 38.
  • the control device 38 can synchronize electrical signals or electrical operating voltages to the pumps 6 and to the pressure relief valve 28 to operate them.
  • a sensor 40 can be provided on the pump 6, which gives electrical signals to the control device 38 as a function of a specific stroke position of the pump piston 8.
  • the sensor 40 sends a signal to the control device 38 when the pump piston 8 reaches a position shortly before the end of the pressure stroke path during its pressure stroke.
  • the control device 38 switches off the pump drive, preferably actuating compressed air or actuating pressure fluid acting on the pump piston 8, shortly before the pump piston reaches the end of the pressure stroke path, a) that the pump piston 8 slows down and thereby "soft" reaches the end of the pressure stroke and b) that, due to the energies present in the system - operating pressure of the pump piston 8, its kinetic energy, fluid pressure in the pressure line 22 and mechanical tension of this pressure line 22 - the liquid 4 is sprayed by the nozzle device 16 until the end of the spraying period without liquid drops forming and falling off.
  • the control device 38 can give a signal to the pressure relief valve 28, by means of which it is opened; it must be open at the latest at the end of the spraying period.
  • the pump piston 8 begins its suction stroke movement.
  • the pressure line valve 24 is now quickly closed.
  • the pressure line 22 can be a hose.
  • the pressure relief valve 28 can be a 2/2-way valve.
  • the duration and the start and end of the spraying period, the size of the suction stroke of the metering pump 6 and thus the amount of liquid sprayed during a spraying period, and other operating parameters can be set to different values.
  • FIG. 2 In the further embodiment of a liquid spraying device shown in FIG. 2, technically or functionally corresponding parts are given the same reference numbers in FIG. 1.
  • a valve 44 controlled and controlled by the control unit 38, is arranged in the pressure line 44 at a point upstream of the connection point of the pressure relief line 26 lies in the pressure line 22.
  • the duration of the spraying period is thus essentially identical to the "open” period of this controlled valve 44.
  • the amount of liquid sprayed during the spraying period is also dependent on the "open” period of this valve 44. Therefore, in the following "metering valve” Called 44.
  • the pump 7 of FIG. 2 is a piston pump and has a suction volume and an equally large pressure volume which are many times larger than the amount of liquid sprayed by the nozzle device 16 during a spraying period.
  • the suction volume is, for example, 200 ml.
  • the amount of liquid sprayed by the pump pressure during a spraying period is, for example, 40 ml.
  • the pump piston 8 is moved by only part of its entire pressure stroke path during a spraying period.
  • Fig. 2 shows the possibility of several pressure lines 22, 22/2, 22/3, 22/4, 22/5 ... for a corresponding same number of nozzle devices to the suction side of the pump 7 16 to connect.
  • liquid can be conveyed individually to one or to a plurality of nozzle devices 16 with a single pump 7 (or with a single pump 6 in FIG. 1).
  • All pressure lines 22, 22/2, 22/3 ... are connected to the pressure-side outlet 20 of the pump 7 via a single check valve 50.
  • This check valve 50 is arranged directly at or near the pressure-side outlet 20 and prevents liquid 4 from being sucked back into the pump 7 from the pressure line sections located upstream of the metering valves 44, 44/2 ... during the suction stroke of the pump 7.
  • This check valve 50 is opened by the delivery pressure of the pump 7 during the pressure stroke in the delivery direction away from the pump 7 against the force of a valve spring 51 and is closed when changing from the pressure stroke to the suction stroke by the valve spring 51 and by the vacuum of the pump 7.
  • the control device 38 gives the pressure relief valve 28 and the metering valves 44, 44/2 ... and the pump 7 the control signals or operating signals in such a way that the pressure relief valve 28 is initially closed during the spraying period, but briefly before the spraying period ends and then until the end of the Spraying period remains open.
  • the control device 38 controls the pump 7 in such a way that it sucks as much liquid 4, for example 200 ml, from the container 2 via the suction line 12 in a single complete suction stroke as is required for several spraying periods. This means that the piston 8 of the pump 7 covers only part of the entire pressure stroke distance during each spraying period. The size of this partial pressure stroke distance depends on whether only one or more of the metering valves 44, 44/2 ...
  • a plurality of sensors 40 can be arranged along the stroke path of the pump 7, which sensors report the respective stroke position of the pump piston 8 to the control device 38 via electrical lines. This enables a check to be made as to whether the pump piston 8 is actually in the position in which it should be based on the control signals from the control device 38. In this way, the control device 38 can determine, for example, whether the pump 7 is always sufficiently filled with liquid 4 or contains air in an undesirable manner. In the same way, the control device 38 can also monitor whether the pump 6 draws in liquid 4 in accordance with the regulations or contains air in an undesirable manner by means of a single or a plurality of sensors 40 in the embodiment according to FIG. Air is much more "flexible", ie it can be compressed much more with a certain pressure of the pump piston 8 than a liquid. As a result, the piston reaches different axial positions with air at a certain piston pressure than with liquid in the cylinder chamber.
  • the optimal relaxation time during which the pressure relief valve 28 of FIGS. 1 and 2 is open and the overlap time by which the relaxation time protrudes into the end of the spraying period depend on the type of liquid. Another key factor is whether the liquid develops or contains gases. For example, some detergents contain or develop gases and then form gas bubbles in the washing liquid. Such gas bubbles are more compressed by the delivery pressure of the pump 6 or 7 during the pressure stroke than the liquid fraction, so that a liquid containing gases also expands much more in the pressure line 22, 22/2, 22/3 ... at the end of the spraying period than a liquid that contains no gases. The greater the proportion of gas in the pressure line 22, 22/2, 22/3 ..., the more important is the pressure relief valve 28.
  • the relaxation time during which the pressure relief valve 28 is used for pressure relief of the pressure line 22, 22 / 2, 22/3 ... must at least be opened between approximately 0.1 s and 2 s, and the overlap time by which the relaxation time extends into the end of the spraying period can range from approximately 0.05 s to 0 , 5 s.

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EP94102871A 1993-06-04 1994-02-25 Dispositif de pulvérisation de liquide, en particulier pour les machines à imprimer Expired - Lifetime EP0627268B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4318647 1993-06-04
DE4318647A DE4318647A1 (de) 1993-06-04 1993-06-04 Flüssigkeits-Sprühvorrichtung, insbesondere für Druckmaschinen

Publications (3)

Publication Number Publication Date
EP0627268A2 true EP0627268A2 (fr) 1994-12-07
EP0627268A3 EP0627268A3 (fr) 1995-07-26
EP0627268B1 EP0627268B1 (fr) 1998-08-26

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP94102871A Expired - Lifetime EP0627268B1 (fr) 1993-06-04 1994-02-25 Dispositif de pulvérisation de liquide, en particulier pour les machines à imprimer

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EP (1) EP0627268B1 (fr)
DE (2) DE4318647A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1719621A1 (fr) * 2005-05-02 2006-11-08 Oxy-Dry Maschinen GmbH Système de nettoyage pour les surfaces des cylindres d'une machine d'impression
EP2065099A1 (fr) * 2007-11-30 2009-06-03 Oskar Frech GmbH + Co. KG Dispositif de pulvérisation d'agent séparateur pour une machine de coulée

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19503950B4 (de) * 1995-02-07 2004-10-28 Heidelberger Druckmaschinen Ag Wascheinrichtung im Druckwerk von Druckmaschinen
DE29905713U1 (de) 1999-03-22 1999-06-17 Buchholtz, Jürgen, 12249 Berlin Auftragskopf für viskose Medien
DE19936144B4 (de) * 1999-07-31 2006-09-21 Koenig & Bauer Ag Einrichtung zum Aufbringen von Flüssigkeit

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SU101336A1 (ru) * 1953-11-09 1954-11-30 Н.Т. Ротань Устройство дл подачи лака к распылительной форсунке дл окраски изложниц
FR1119306A (fr) * 1955-01-12 1956-06-19 Fabre Ulysse Ets Ensemble unitaire de dispositifs de pulvérisation destiné à être monté sur véhicules, et fonctionnant à haute pression
US3252442A (en) * 1963-03-27 1966-05-24 Jones & Laughlin Steel Corp Apparatus for spray coating hollow articles
DE2826135C2 (de) * 1978-06-15 1982-11-18 Baldwin-Gegenheimer GmbH, 8900 Augsburg Gummituch-Waschvorrichtung
US4387850A (en) * 1980-12-29 1983-06-14 Modern Mill, Inc. Remote control apparatus for power washers
DE3714000A1 (de) * 1987-04-27 1988-11-10 Behr Industrieanlagen Steuersystem fuer eine programmgesteuerte spruehvorrichtung
WO1989001412A2 (fr) * 1987-08-17 1989-02-23 Precision Engineered Systems Inc. Systeme de lavage automatique de blanchet a ecoulement a travers des barres de pulverisation
US4932232A (en) * 1988-05-20 1990-06-12 Alcan Aluminum Corporation Methods of detecting and correcting spray header malfunctions
DE8915850U1 (de) * 1989-12-22 1991-09-19 Robert Breining Maschinen- & Fahrzeugbau GmbH u. Co, 73630 Remshalden Einrichtung zum dosierten Auftragen eines flüssigen Bindemittels, insbesondere von Bitumen, auf eine Oberfläche
DE4013064A1 (de) * 1990-04-24 1991-10-31 Ficht Gmbh Verfahren zum spruehstrahlen von farbe und anordnung zur durchfuehrung des verfahrens
DE4122594C2 (de) * 1991-05-23 1997-07-03 E I C Group Gmbh Vorrichtung zum einstellbaren Zuführen eines flüssigen Materials

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1719621A1 (fr) * 2005-05-02 2006-11-08 Oxy-Dry Maschinen GmbH Système de nettoyage pour les surfaces des cylindres d'une machine d'impression
US7530307B2 (en) 2005-05-02 2009-05-12 Baldwin Oxy-Dry Gmbh Cleaning system for cylinder surfaces of a printing machine
EP2065099A1 (fr) * 2007-11-30 2009-06-03 Oskar Frech GmbH + Co. KG Dispositif de pulvérisation d'agent séparateur pour une machine de coulée
EP2065100A1 (fr) 2007-11-30 2009-06-03 Oskar Frech GmbH + Co. KG Dispositif de pulvérisation d'agent séparateur pour une machine de coulée
US8042750B2 (en) 2007-11-30 2011-10-25 Oskar Frech Gmbh & Co. Kg Release agent spray device for a casting machine

Also Published As

Publication number Publication date
EP0627268B1 (fr) 1998-08-26
DE4318647A1 (de) 1994-12-08
DE59406758D1 (de) 1998-10-01
EP0627268A3 (fr) 1995-07-26

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