EP1691076A1 - Auftragsvorrichtung mit volumetrischer Förderpumpe - Google Patents

Auftragsvorrichtung mit volumetrischer Förderpumpe Download PDF

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Publication number
EP1691076A1
EP1691076A1 EP05001627A EP05001627A EP1691076A1 EP 1691076 A1 EP1691076 A1 EP 1691076A1 EP 05001627 A EP05001627 A EP 05001627A EP 05001627 A EP05001627 A EP 05001627A EP 1691076 A1 EP1691076 A1 EP 1691076A1
Authority
EP
European Patent Office
Prior art keywords
pump
valve
dispensing
flow
return
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Withdrawn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
EP05001627A
Other languages
German (de)
English (en)
French (fr)
Inventor
Joerg-Olaf Bagung
Olaf Thieme
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.)
Nordson Corp
Original Assignee
Nordson Corp
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 Nordson Corp filed Critical Nordson Corp
Priority to EP05001627A priority Critical patent/EP1691076A1/de
Priority to JP2006018317A priority patent/JP2006205164A/ja
Publication of EP1691076A1 publication Critical patent/EP1691076A1/de
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • B05B9/0416—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 pumps comprising rotating pumping parts, e.g. gear pump, centrifugal pump, screw-type pump
    • 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
    • B05B9/002—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour incorporating means for heating or cooling, e.g. the material to be sprayed

Definitions

  • the invention relates to an application device for applying application materials, comprising a delivery pump with a pump inlet opening and a pump outlet opening, a material source, which is in fluid communication with the pump inlet opening of the pumping device and is designed to provide application material at the pump inlet opening, a discharge opening in fluid communication with the pump outlet opening is formed and designed for dispensing the application material.
  • Another aspect of the invention is a pumping apparatus having a delivery pump including a pump inlet port and a pump outlet port, wherein the pump inlet port may be fluidly connected to a material source configured to provide application material at the pump inlet port and the pump outlet port is in fluid communication with a pump source port Dispensing opening can be set, which is designed to output the application material.
  • the invention relates to a method for applying a coating material to a substrate, in which aboundungssmateriäl is conveyed by means of a feed pump from a material source to a discharge opening.
  • Application devices, application methods and pumping devices for such application devices are known in the art. They are characterized in that by the feed pump, the application material with a pressure that can be predicted and controlled or regulated, is provided and then on a substrate which is arranged in the conveying direction behind the discharge opening, can be applied.
  • the substrate is in an environment below atmospheric pressure and the flow of material from the discharge opening is created by an overpressure prevailing between the pump outlet and the discharge opening.
  • the known devices and methods of the type mentioned are operated with feed pumps that put the application material under pressure and thereby can provide a certain level of pressure.
  • feed pumps are designed, for example, as screw extruders and, when the pressure of the application material between the pump and dispensing opening has reached or exceeded a certain value, allow a backflow of the application material against the conveying direction of the pump or a persistence of the application material at a point when working pump. In this way, it is prevented in the known devices and methods that the application material is exposed to an excessive pressure or that parts of the application device take damage due to excessive pressure.
  • the known delivery pumps have the disadvantage that they are not suitable for the application image at change in the flow cross-section of the discharge opening or changing pressure conditions, especially at to keep abrupt changes in these quantities constant.
  • a disadvantage of the known conveying devices and methods is that the order result can be adversely affected thereby.
  • a further disadvantage of the known devices and methods is that in the order process performed therewith regularly a pressure drop at the beginning of A legislativeragsvorgangs and a pressure increase at the end of the job process occurs, which can lead to an unfavorable formation of the beginning and the end of the application image.
  • a further disadvantage of known application devices and methods is that the pressure provided between the delivery pump and discharge opening can not be reliably adjusted and depends, for example, on the wear state of the delivery pump, the temperature of the application material and other factors. This makes it impossible with the known methods and devices to obtain reproducible order results under varying operating conditions.
  • the object of the invention is to provide an application device, an application method and a pump device for such an application device, which (s) reduces or preferably avoids at least one of the aforementioned problems.
  • the invention is based on the finding that the result of an application process regularly depends on the constancy of the volume flow of the application material emerging from the delivery opening. This consistency can be guaranteed with a volumetric delivery pump.
  • a volumetric delivery pump is to be understood here as meaning a pump which has a volume delivery rate which is independent or at least largely independent of the pressure on the suction and delivery sides.
  • the pump may be designed as a discontinuous or continuously operating positive displacement pump, such as a piston pump or as an eccentric pump.
  • Volumetric feed pumps are characterized by the fact that they can theoretically build up an infinitely high pressure during conveyance against a closed pump outlet or into a closed volume connected to the pump outlet, and as a result may be damaged. It is therefore necessary to provide measures that limit the pressure on the pressure side of the pump.
  • This is inventively achieved by the return line, which allows a direct circulation of the application material and thus provides the circulation of application material through the feed pump, via the return line and again by the feed pump. In this way it can be avoided that the pressure on the pressure side increases when no or little application material is dispensed from the discharge opening.
  • the material source may comprise a hopper, a material container or a receptacle for a replaceable material container and is formed in the simplest case by an opening through which material can be supplied to get to the feed pump.
  • the return line can extend from any point between the pump outlet opening and the discharge opening to an arbitrary point between the material source and the pump inlet opening or open directly into the material source.
  • the return line is associated with a return valve, which is designed to release the order material flow through the return line and lock, preferably also to throttle.
  • This training makes it possible to control the order material flow through the return line so that a certain pressure or Pressure range between the discharge port and the pump outlet opening is maintained or that a certain material flow is maintained through the discharge opening.
  • the return valve may be formed as a switching valve with two valve positions, namely an open and a closed position.
  • the return valve may be formed as a control valve with a variable flow cross-section in order to have at least one further valve position between the open and the closed position, in which a reduced flow cross-section relative to the open position is provided.
  • the return valve is a flow in the cross-section preferably variable valve, which changes its flow cross-section depending on the pressure of the application material on the input side, in particular increases its flow cross-section with increasing pressure and decreases with decreasing pressure.
  • the thus formed return valve may include, for example, an applied by the application material pressure surface which applies an opening force on the valve and acts with this opening force against a closing force.
  • This closing force can be provided for example by a spring or by an air pressure and is preferably adjustable.
  • the valve can completely or partially release its flow cross-section when a certain application material pressure is exceeded, wherein the released flow cross-section proportion is related to the application material pressure and also increases with increasing Anstragsmaterialdruck. In this way, an automatic return valve can be provided which easily maintains and maintains an adjustable application material pressure between dispensing opening and pump outlet opening, even if the dispensing opening should be opened or closed abruptly.
  • the pressure on the input side of the return valve is adjustable by the required for a change in the flow cross-section pressure at the return valve is adjustable. This can be achieved by adjusting the spring force or increasing the counter-air pressure in a valve of the type described above, thus allowing the applicator to adapt to different application processes.
  • the applicator device can be further developed by a control or regulating device for controlling or regulating a return valve associated with the return line and / or a dispensing valve associated with the dispensing opening.
  • This control device may include a simple electronic, analogue or digital controller that controls the return valve and / or the dispensing valve, for example, when implemented as electrically, magnetically, hydraulically or pneumatically actuated valves.
  • only one of the two valves can be controlled and the other valve designed as an automatic valve or be coupled to the controlled or regulated valve such that the control or regulation between the valves transmits and the flow cross-sections of the two valves be set in dependence of each other.
  • control or regulating device is designed to couple the return valve and the dispensing valve with each other.
  • This allows a simple and subsequently easily changeable coupling of the two valves.
  • the coupled control or regulation can be adapted on the one hand with regard to the ratio of the flow cross sections of the two valves and can also be influenced by other factors such as temperature or pressure of the application material, which can be detected by corresponding sensors and fed to the control device become.
  • a further advantageous embodiment is characterized in that the dispensing opening is assigned a dispensing valve which is designed to release and block the flow of order material through the dispensing opening, preferably also to throttle.
  • the dispensing valve is preferably controllable or controllable and can be actuated by an external control or regulation which opens or closes the dispensing valve depending on the executed order process.
  • the dispensing valve provides a reduced flow area, for example, to provide a smaller amount of application material per unit time.
  • the return valve and a dispensing opening associated with the dispensing valve are coupled such that the Dürch Wegrten the return valve is reduced when the flow cross-section of the dispensing valve is increased, and the flow cross-section of the return valve is increased when the flow cross-section of the dispensing valve decreases becomes.
  • This coupling can be achieved by a correspondingly coupled control or regulation of the two valves, for example, when these valves are electrically; hydraulically or pneumatically actuated and the corresponding control or flow of fluid or fluid flow is metered such that the corresponding, opposite flow cross-section changes are achieved.
  • an inversely proportional relationship between the flow cross sections of the two valves can be generated.
  • a further development consists in that the return valve and a dispensing valve associated with the dispensing valve are coupled together in such a way that the flow cross-section of the return valve is blocked when the Flow cross-section of the dispensing valve is released, and the flow cross-section of the return valve is released when the flow cross-section of the dispensing valve is locked.
  • This embodiment is particularly suitable when return valve and / or dispensing valve are designed as switching valves that can only be switched between an open and a closed position back and forth.
  • the application device according to the invention can be developed by a heating device for heating the material source, a heating device for heating the feed pump, a heating device for heating the return valve and / or a heating device for heating the dispensing valve.
  • These heaters can be designed, for example, as electrical heating elements, hot water jackets or hot air blower.
  • Such a heater allows the application of thermoplastic coating materials, such as hot melt adhesives.
  • the application material between the material source, feed pump and discharge opening is conveyed via delivery lines and at least one of the delivery lines is associated with a heating device. This allows the application material to be heated, as described above, and may be provided as an alternative or in addition to the previously described heating devices to allow increased heating power and more homogeneous heating of the application material.
  • the feed pump is a positive displacement pump, preferably a positive displacement pump with a rotating displacer.
  • a displacement pump has the advantage that a constant volume flow of the application material is provided.
  • an eccentric screw pump is advantageous as a feed pump.
  • Such progressing cavity pumps promote the material in a non-pulsating manner and are therefore particularly well suited for a job.
  • Eccentric screw pumps typically include a rotating helical shaft (called a "rotor” or “worm”) located in a fixed housing (called a “stator” or “worm shell”) with a longitudinal cavity in the form of threads.
  • the housing is often formed of an elastic material, such as rubber.
  • the flow rate of progressing cavity pumps is constant at constant speed and largely independent of the pressure on the suction or pressure side of the pump.
  • the flow rate is typically speed dependent.
  • the invention can also be carried out particularly advantageously by advanced progressive cavity pumps, such as double pump arrangements.
  • the return line opens into a material supply line which connects the material source to the pump inlet opening. This embodiment makes it possible to easily circulate the application material when the delivery opening is closed or at least largely closed.
  • the application device according to the invention can be developed by the return line opens adjacent to the pump inlet opening in the material supply.
  • the object underlying the invention is further achieved with a pump device mentioned above, in which the feed pump is a volumetric feed pump and the pump outlet opening is set via a return line to the pump inlet opening in Fiuidtim.
  • the thus developed pumping device represents a pumping unit which can be used particularly advantageously in application devices, thereby enabling the advantages described above in connection with the application device according to the invention.
  • the pumping device according to the invention can be developed with a return valve, as described above.
  • a further development comprises a control or regulating device which is designed to control, preferably to couple with one another, a return valve associated with the return line and a dispensing valve associated with the dispensing opening.
  • the pumping device is formed by a heating device for heating the feed pump, a heating device for heating the return valve and / or a heating device for heating the dispensing valve.
  • the inventive method allows a constant flow through the use of a volumetric feed pump, which, as described above, preferably a positive displacement pump, in particular a positive displacement pump with a rotary displacer, such as an eccentric screw, may be.
  • a volumetric feed pump which, as described above, preferably a positive displacement pump, in particular a positive displacement pump with a rotary displacer, such as an eccentric screw, may be.
  • the material flow conveyed by the feed pump is partially discharged from the discharge opening and is partially conveyed back to the suction side of the pump via a return line.
  • the material flow is split and partially applied to the substrate and partially recirculated.
  • the respective proportions of the order raw material flow may preferably be dimensioned such that a job pressure required for a good application pattern is maintained.
  • the volume flow and / or pressure of the dispensed from the dispensing opening application material is controlled or regulated via a dispensing valve and / or controlled via the return line to the suction side of the pump back flow rate and / or pressure of the application material controlled by a return valve or is regulated.
  • the Control over these alternatively or jointly arranged valves allows a particularly effective control or regulation of the material volume flow and the pressure of this application material.
  • the material volume flow discharged from the discharge opening is regulated via a variable flow rate in the discharge valve and / or via the return line to the suction side of the pump material volume flow via a flow cross-section variable return valve such that in the conveying direction before the discharge opening arranged application material is provided with a predetermined pressure / pressure range or with a predetermined volume flow / volume flow range.
  • Figure 1 shows an embodiment of the applicator device according to the invention with a hopper 10, can be filled directly into the application material in liquid or pasty form, powder form, granular form or in other solid forms or can be supplied by placing a container on a flange 11 of the hopper 10.
  • the application material via an opening 12 in a MaterialzuQuery Koch 13 (not shown in Figure 1) is introduced, which directs the application material to an eccentric screw pump 30.
  • the hopper 10 is provided with a heater 210 which surrounds the hopper 10 as far as possible.
  • the material feed tube 13 carries the application material from the hopper 10 under the influence of gravity and by the suction force of the eccentric screw pump 30 into a connection housing 20, which is connected to the eccentric screw pump 30 via a radial connection flange 31.
  • the application material passes through an axial channel 21 of the connection housing 20 and into a material supply channel 32 extending radially to the conveying direction of the eccentric screw pump 30. From the material feed channel 32, the application material is introduced into the moving delivery volumes between a screw 33 (not shown in FIGS. 2 and 3) and a housing 34 of the eccentric screw pump and conveyed from a filling end 35 to an outlet end 36.
  • the worm 33 is offset by an electric motor 40 in a continuous rotation about an axis lying along the conveying direction.
  • the conveyed application material enters a valve housing 41 attached to a connecting flange 37.
  • a first channel 45 is formed which extends from an inlet opening 42 of the application material into the valve housing to a discharge opening 44, which is arranged downstream of the discharge opening by a dispensing valve (not shown in FIGS. 1-3). can be closed.
  • a second channel 46 in communication, which leads to a return valve 60.
  • the application material flowing through the second channel 46 is guided via a third channel 47 to a return line 70 when the return valve 60 is open.
  • the material flow through the channels 46, 47 can be closed with the return valve 60.
  • FIG. 4 shows a schematic view of an eccentric screw pumice, as used for the application and pumping device according to the invention can.
  • the illustrated eccentric screw pump comprises a drive motor 140, which sets a worm 133 in rotation.
  • the worm 133 is designed in the illustrated embodiment as a threaded screw with a large pitch, large flight depth and small core diameter and has a round cross section.
  • the housing 134 which ausbitdet the stator of the eccentric screw, has a cross-section formed as an elongated hole cavity which extends over the entire length of the housing and in which the screw rotates.
  • the cavity in the stator forms two threads and has twice the pitch length in relation to the screw 133.
  • the illustrated eccentric screw pump is for the inventive device and the method according to the invention only by way of example and can be replaced by differently shaped eccentric screw pumps, such as eccentric screw pumps with screws having an elliptical cross-section with a corresponding stator with three threads and 1.5-fold pitch length to be replaced or by other positive displacement pumps.
  • eccentric screw pumps with screws having an elliptical cross-section with a corresponding stator with three threads and 1.5-fold pitch length to be replaced or by other positive displacement pumps.
  • the pump 330 conveys the application material via a delivery line 381 to a filter 380 and from there to a branch 382.
  • the application material is continued during the application process to a tube 400, wherein the order material pressure is detected by a pressure sensor 410.
  • the tube 400 supplies the material to a discharge port 344.
  • the flow of material through the dispensing opening 344 may be released, blocked, and throttled by a dispensing valve 350 disposed between the hose 400 and the dispensing opening 344.
  • the supply material at the branch 382 may flow toward a return valve 360, which then completely or partially releases the order flow of material through a return line 370.
  • the return valve 360 is controlled pneumatically via a control and regulating device 420.
  • the control device 420 includes an input 421 for compressed air, a pressure control valve 422, which forwards the compressed air with a certain pressure to a multi-way valve 423.
  • the control device 420 has an output (not shown) that simultaneously controls the dispensing valve 350 and the return valve 360.
  • one of the valves is designed as an opener and the other as normally open, so that with a control voltage simultaneous opening of the one and closing the other valve is achieved.
  • the control and regulation device 420 also has inputs (not shown) for connecting temperature and pressure sensors, which monitor the temperature and the pressure of the application material in the system parts, in particular in the flow direction in front of and behind the return and the discharge valve.
  • the multiway valve 423 may be electrically actuated by an electrical circuit (not shown) of the controller 420 and is typically actuated to open the return valve 360 when the dispensing valve 350 is closed.
  • the pressure of the control compressed air supplied from the multi-way valve 423 to the return valve is detected via a pressure sensor 424.

Landscapes

  • Coating Apparatus (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Reciprocating Pumps (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
EP05001627A 2005-01-27 2005-01-27 Auftragsvorrichtung mit volumetrischer Förderpumpe Withdrawn EP1691076A1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP05001627A EP1691076A1 (de) 2005-01-27 2005-01-27 Auftragsvorrichtung mit volumetrischer Förderpumpe
JP2006018317A JP2006205164A (ja) 2005-01-27 2006-01-27 容積型搬送ポンプを備える塗布装置

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP05001627A EP1691076A1 (de) 2005-01-27 2005-01-27 Auftragsvorrichtung mit volumetrischer Förderpumpe

Publications (1)

Publication Number Publication Date
EP1691076A1 true EP1691076A1 (de) 2006-08-16

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EP05001627A Withdrawn EP1691076A1 (de) 2005-01-27 2005-01-27 Auftragsvorrichtung mit volumetrischer Förderpumpe

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EP (1) EP1691076A1 (ja)
JP (1) JP2006205164A (ja)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3225315A1 (de) * 2016-04-01 2017-10-04 ViscoTec Pumpen- und Dosiertechnik GmbH Verfahren und dosiervorrichtung zum druckgeregelten dosieren eines flüssigen oder pastösen produkts
EP3546071A1 (de) 2018-03-27 2019-10-02 Robatech AG Vorrichtung zum intermittierenden auftragen eines fliessfähigen stoffs, sowie verfahren zum auftragen eines solchen stoffs

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5759058B1 (ja) * 2014-03-11 2015-08-05 エンジニアリングシステム株式会社 微量流体流出方法および微量流体ディスペンサ
JP5856335B1 (ja) * 2014-07-31 2016-02-09 エンジニアリングシステム株式会社 微量液体流出方法および微量液体ディスペンサ

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2169514A (en) * 1937-09-01 1939-08-15 Vilbiss Co Spray apparatus
DE686631C (de) 1936-05-26 1940-01-13 Brev Moineau S A R L Soc D Exp Schraubenpumpe oder -motor
US2505136A (en) 1946-06-18 1950-04-25 Robbins & Myers Internal helical gear pump
FR1011885A (fr) * 1949-04-12 1952-07-01 Dispositif pour l'imprégnation de fibres textiles
US2640421A (en) * 1948-08-18 1953-06-02 Peter H Lindberg Manifold high-pressure pump
DE1204072B (de) * 1957-12-12 1965-10-28 Colcrete Ltd Vorrichtung zum Austragen und gleichzeitigen Foerdern zementhaltiger Massen aus einem Vorratsbehaelter mit einer nach unten foerdernden einwelligen Schneckenpumpe
EP0713974A1 (de) 1994-11-25 1996-05-29 Netzsch Mohnopumpen GmbH Exzenterschneckenpumpe

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE686631C (de) 1936-05-26 1940-01-13 Brev Moineau S A R L Soc D Exp Schraubenpumpe oder -motor
US2169514A (en) * 1937-09-01 1939-08-15 Vilbiss Co Spray apparatus
US2505136A (en) 1946-06-18 1950-04-25 Robbins & Myers Internal helical gear pump
US2640421A (en) * 1948-08-18 1953-06-02 Peter H Lindberg Manifold high-pressure pump
FR1011885A (fr) * 1949-04-12 1952-07-01 Dispositif pour l'imprégnation de fibres textiles
DE1204072B (de) * 1957-12-12 1965-10-28 Colcrete Ltd Vorrichtung zum Austragen und gleichzeitigen Foerdern zementhaltiger Massen aus einem Vorratsbehaelter mit einer nach unten foerdernden einwelligen Schneckenpumpe
EP0713974A1 (de) 1994-11-25 1996-05-29 Netzsch Mohnopumpen GmbH Exzenterschneckenpumpe

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3225315A1 (de) * 2016-04-01 2017-10-04 ViscoTec Pumpen- und Dosiertechnik GmbH Verfahren und dosiervorrichtung zum druckgeregelten dosieren eines flüssigen oder pastösen produkts
WO2017167478A1 (de) * 2016-04-01 2017-10-05 Viscotec Pumpen- U. Dosiertechnik Gmbh Verfahren und dosiervorrichtung zum druckgeregelten dosieren eines flüssigen oder pastösen produkts
US11154829B2 (en) 2016-04-01 2021-10-26 Viscotec Pumpen-U. Dosiertechnik Gmbh Method and metering device for metering a liquid or pasty product in a pressure-regulated manner
EP3546071A1 (de) 2018-03-27 2019-10-02 Robatech AG Vorrichtung zum intermittierenden auftragen eines fliessfähigen stoffs, sowie verfahren zum auftragen eines solchen stoffs
US11273461B2 (en) 2018-03-27 2022-03-15 Robatech Ag Device for intermittently applying a flowable substance, and method for applying such a substance

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Publication number Publication date
JP2006205164A (ja) 2006-08-10

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