EP4076770A1 - Device for applying viscous material to workpieces - Google Patents

Device for applying viscous material to workpieces

Info

Publication number
EP4076770A1
EP4076770A1 EP21702674.9A EP21702674A EP4076770A1 EP 4076770 A1 EP4076770 A1 EP 4076770A1 EP 21702674 A EP21702674 A EP 21702674A EP 4076770 A1 EP4076770 A1 EP 4076770A1
Authority
EP
European Patent Office
Prior art keywords
measuring element
valve
piston
plunger
axis
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
EP21702674.9A
Other languages
German (de)
French (fr)
Other versions
EP4076770B1 (en
Inventor
Heiko Bitzel
Bastian Prinz
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.)
Atlas Copco IAS GmbH
Original Assignee
Atlas Copco IAS 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 Atlas Copco IAS GmbH filed Critical Atlas Copco IAS GmbH
Publication of EP4076770A1 publication Critical patent/EP4076770A1/en
Application granted granted Critical
Publication of EP4076770B1 publication Critical patent/EP4076770B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
    • B05C5/0225—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work characterised by flow controlling means, e.g. valves, located proximate the outlet
    • B05C5/0237—Fluid actuated valves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/14—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with multiple outlet openings; with strainers in or outside the outlet opening
    • B05B1/16—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with multiple outlet openings; with strainers in or outside the outlet opening having selectively- effective outlets
    • B05B1/1609—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with multiple outlet openings; with strainers in or outside the outlet opening having selectively- effective outlets with a selecting mechanism comprising a lift valve
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/30—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages
    • B05B1/3033—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head
    • B05B1/304—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head the controlling element being a lift valve
    • B05B1/3046—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head the controlling element being a lift valve the valve element, e.g. a needle, co-operating with a valve seat located downstream of the valve element and its actuating means, generally in the proximity of the outlet orifice
    • B05B1/306—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head the controlling element being a lift valve the valve element, e.g. a needle, co-operating with a valve seat located downstream of the valve element and its actuating means, generally in the proximity of the outlet orifice the actuating means being a fluid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B13/00—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00
    • B05B13/02—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work
    • B05B13/04—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work the spray heads being moved during spraying operation
    • B05B13/0421—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work the spray heads being moved during spraying operation with rotating spray heads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
    • B05C5/027—Coating heads with several outlets, e.g. aligned transversally to the moving direction of a web to be coated
    • B05C5/0275—Coating heads with several outlets, e.g. aligned transversally to the moving direction of a web to be coated flow controlled, e.g. by a valve
    • B05C5/0279—Coating heads with several outlets, e.g. aligned transversally to the moving direction of a web to be coated flow controlled, e.g. by a valve independently, e.g. individually, flow controlled
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B13/00—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00
    • B05B13/02—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work
    • B05B13/04—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work the spray heads being moved during spraying operation
    • B05B13/0431—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work the spray heads being moved during spraying operation with spray heads moved by robots or articulated arms, e.g. for applying liquid or other fluent material to 3D-surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
    • B05C5/0225—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work characterised by flow controlling means, e.g. valves, located proximate the outlet

Definitions

  • the invention relates to a device for applying viscous material to workpieces according to the preamble of claim 1.
  • Such devices are used to apply viscous materials such as adhesives, sealants or paints to workpieces. Often several nozzles of different geometries mounted on the rotating lance are used, into each of which a material outlet opens.
  • a needle valve is assigned to each material outlet, the valve needle of which closes or releases the relevant material outlet on a valve seat.
  • Cylinders are provided for actuating the valve needles, each valve needle being connected to the piston of a cylinder which is moved by being pressurized by a fluid, in particular compressed air.
  • the cylinders are arranged next to one another at the same distance from the valve seats, and the device is controlled in such a way that only one of the needle valves opens for material application.
  • the invention is based on the idea of allowing all pistons to act on a common measuring element by means of the tappets, the position of which can then be detected by the sensor.
  • the cylinders of which are arranged next to one another, in particular in the sense that their cross-sections do not overlap perpendicular to the axis of rotation, with, for example, the lower and / or upper boundary surfaces of the piston chambers each being arranged in one plane.
  • the rotary lance it is also possible for the rotary lance to have only one needle valve with a cylinder, in particular arranged eccentrically with respect to a central longitudinal axis.
  • the measuring element can be designed to be rotationally symmetrical, at least with regard to its parts acting on the sensor, so that its interaction with the sensor of the holding device does not change or does not change significantly even when the rotary lance is rotated with respect to the holding device.
  • the axis of rotation is also expediently a central longitudinal axis of the rotary lance or of the measuring element.
  • the at least one piston is preferably acted upon by means of compressed air and, as a fail-safe function, also expediently has a spring action which urges it into a position in which the valve needle sits sealingly on the associated valve seat.
  • the measuring element can be designed in different configurations. However, it is preferred that it has a permanent magnet while the sensor is a magnetic sensor. It is preferred that the permanent magnet has the shape of a circular ring that revolves around the axis of rotation, so that a rotation of the rotary lance with respect to the holding device does not result in any change in the interaction of the permanent magnet with the magnetic sensor. In particular, the permanent magnet is axially polarized so that its poles follow one another in the axial direction. In order to save on expensive magnetic material, it is preferred that the radius of the circular ring is at least 5 times, preferably at least 8 times as large as its thickness measured in the radial direction.
  • the measuring element expediently has a holding plate which can be acted upon by the plunger and to which the permanent magnet is fastened.
  • the rotary lance preferably has a housing made of non-ferromagnetic material, in which the at least one cylinder and the measuring element are accommodated.
  • a particularly suitable material for the housing is aluminum, which hardly hampers the detection of the permanent magnet by means of the magnetic sensor.
  • the measuring element is expediently displaceable against a restoring force in the direction away from at least one cylinder, so that the restoring force the
  • the restoring force is expediently applied by at least one compression spring which is arranged between the measuring element and a housing cover that delimits the housing at the top.
  • the at least one compression spring can be designed as a helical spring.
  • each guide pin extending in the longitudinal direction, each guide pin extending through the measuring element.
  • a guide pin is arranged in the middle, so that the axis of rotation extends through it, while further guide pins can be arranged off-center.
  • at least one of the guide pins runs centrally through one of the compression springs.
  • the cylinders are arranged at the same distances from one another and at the same distances from the axis of rotation in order to achieve the greatest possible symmetry.
  • each plunger is eccentrically connected to the respective piston and is arranged closer to the axis of rotation than the longitudinal center axis of the piston, a torque exerted by the plunger on the measuring element is reduced, so that the risk of the measuring element jamming in the housing is further reduced.
  • each of the compression springs is assigned a further compression spring which counteracts it with a weaker restoring force and presses against the measuring element from below.
  • the further compression springs can also advantageously be designed as helical springs and arranged around the guide pins. The forces of the restoring springs and the further restoring springs then still result in a restoring force urging the measuring element into its starting position.
  • the provision of the further return springs helps to prevent the measuring element from tilting in the housing.
  • FIG. 1 shows a device for applying viscous material in a perspective view
  • FIG. 2a, 2b show a part of the device according to FIG. 1 in a sectional side view and in a perspective view.
  • the device 10 shown in the drawing is used to apply viscous material to workpieces, in the present exemplary embodiment, to apply paint.
  • the application device 10 has a holding device 12, which is intended for mounting on a robot arm.
  • a rotary lance 14 is mounted in the holding device 12 and is rotatable with respect to the holding device 12 about an axis of rotation extending in a longitudinal direction 16.
  • the rotary lance 14 has at its lower end three material outlets 18 at which viscous material for application to a workpiece can exit from a housing 20 of the rotary lance 14 made of aluminum and at which an application nozzle is usually mounted.
  • Each needle valve 22 is accommodated in the housing 20, each needle valve 22 being assigned to one of the material outlets 18.
  • the valve needles 24 of the needle valves 22 each close one of the material outlets 18 on a valve seat or release the material outlet 18 by lifting it off the valve seat.
  • Each of the needle valves is assigned a double-acting pneumatic cylinder 26, in the piston chamber 28 of which a piston 30 can be moved back and forth in the longitudinal direction 16, to which the relevant valve needle 24, which also extends in the longitudinal direction 16, is firmly connected.
  • a movement of the piston 30 by means of pressurized air thus results in a movement of the valve needle 24 and in an opening or closing of the relevant material outlet 18 on the valve seat.
  • a closing spring 32 arranged in the piston chamber 28 and designed as a helical spring presses the respective piston 30 downwards and the valve needle 24 onto the associated valve seat, so that the material outlets 18 are always closed if the compressed air fails.
  • the device 10 is controlled in such a way that only one material outlet 18 is opened at a time.
  • the holding device 12 has a permanently mounted magnetic sensor 34. This detects the position of a movable measuring element 36 in the housing 20 of the rotary lance 14.
  • the measuring element 36 has a holding plate 38 which can be moved back and forth in the longitudinal direction 16 in the housing 20 and an annular permanent magnet 40 firmly connected to the holding plate 38.
  • the holding plate 38 is guided on a central guide pin 42 and on three outer guide pins 44, each of the guide pins 42, 44 extending through an opening in the holding plate 38 extends.
  • a compression spring 48, 50 which is supported on a housing cover 46 at the top and on the holding plate 38 at the bottom and presses the measuring element 36 downward is arranged around each of the guide pins 42, 44. These are a central compression spring 48 arranged around the central guide pin 42 and three outer compression springs 50 each arranged around one of the outer guide pins 44 The upper side of the piston chamber 28 in question facing the measuring element 36 is led out and rests against the holding plate 38. If one of the material outlets 18 is opened by lifting the relevant piston 30, the plunger 52 connected to this piston 30 pushes the measuring element 46 upwards so that the magnetic sensor 34 can detect the movement of the permanent magnet 40. The magnetic sensor 34 then generates a “valve open” signal. If the material outlet 18 is closed again by lowering the relevant piston 30, the compression springs 48, 50 lower the measuring element 36, which is detected by the magnetic sensor 34, which generates a signal “valves closed”.
  • the cylinders 26 are arranged next to one another in the sense that their cross-sections made perpendicular to the longitudinal direction 16 do not overlap. A loading of the measuring element 36 by means of the plunger 52 can therefore not take place centrally, i.e. in the middle of the holding plate 38.
  • the plungers 52 are arranged eccentrically on the piston 30 and as far as possible in the direction offset to the center of the holding plate 38 or in the direction of the central longitudinal axis of the rotary lance 14.
  • a further, weaker compression spring 48 ', 50' which presses against the holding plate 38 from below.
  • the compression springs 48, 50 and the further compression springs 48 ', 50' are dimensioned in such a way that each pair consisting of one of the compression springs 48, 50 and the opposite further compression spring 48 ', 50' exerts a total force on the holding plate 38 , which is directed downward, that is, in the direction of the cylinder 26.
  • the rotary lance 14 has three needle valves 22. It goes without saying that the rotary lance 14 can be equipped with one, two or more than three needle valves 22.
  • the invention relates to a device 10 for applying viscous material to workpieces with a rotary lance 14 which is rotatably arranged in a holding device 12 about an axis of rotation running in a longitudinal direction 16 and which has at least one material outlet 18, with each material outlet 18 having a needle valve 22 is assigned, by means of which valve needle 24 extending in the longitudinal direction 16, the respective material outlet 18 can be closed on a valve seat, and each valve needle 24 is assigned a cylinder 26, in the piston chamber 28 of which a piston 30 is movable by being pressurized by a fluid, with which the valve needle 24 is firmly connected.
  • a tappet 52 is connected to each piston 30 and is located on the valve seat facing away from the at least one valve seat
  • the top is sealed out of the relevant piston chamber 28, that the rotary lance 14 has a measuring element 36 that can be acted upon by means of the plunger 52 and is displaceable in the longitudinal direction 16, and that the holding device 12 has a sensor 34 for determining the position of the measuring element 36.

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  • Engineering & Computer Science (AREA)
  • Robotics (AREA)
  • Coating Apparatus (AREA)

Abstract

The invention relates to a device (10) for applying viscous material to workpieces, comprising a rotary lance (14) provided in a holder apparatus (12) so as to rotate about an axis of rotation running in a longitudinal direction (16), the lance having at least one material outlet (18), wherein: a needle valve (22) is associated with each material outlet (18), the longitudinally (16) extending valve needle (24) of which valve is used to close each material outlet (18) on a valve seat; and each valve needle (24) has an associated cylinder (26), in the plunger chamber (28) of which a plunger (30) can be moved by pressure applied by means of a fluid, the valve needle (24) being permanently connected to the plunger. According to the invention: a tappet (52) is connected to each plunger (30), the tappet, at its upper end facing away from the at least one valve seat, being sealingly guided out of the associated plunger chamber (28); the rotary lance (14) has a measuring element (36) which can be acted upon by the tappet (52) and moved in the longitudinal direction (16); and the holder apparatus (12) has a sensor (34) for determining the position of the measuring element (36).

Description

Vorrichtung zum Aufträgen von viskosem Material auf Werkstücke Device for applying viscous material to workpieces
Die Erfindung betrifft eine Vorrichtung zum Aufträgen von viskosem Material auf Werkstücke gemäß Oberbegriff des Anspruchs 1. The invention relates to a device for applying viscous material to workpieces according to the preamble of claim 1.
Solche Vorrichtungen werden dazu verwendet, viskose Materialien wie beispielsweise Klebstoffe, Dichtstoffe oder Lacke auf Werkstücke aufzutragen. Dabei kommen oft mehrere an der Drehlanze montierte Düsen unterschiedlicher Geometrie zum Einsatz, in die jeweils ein Materialauslass mündet. Jedem Materialauslass ist ein Nadelventil zugeordnet, dessen Ventilnadel den betreffenden Materialauslass an einem Ventilsitz verschließt oder freigibt. Zur Betätigung der Ventilnadeln sind Zylinder vorgesehen, wobei jede Ventilnadel mit dem Kolben eines Zylinders verbunden ist, welcher mittels Druckbeaufschlagung durch ein Fluid, insbesondere Druckluft, bewegt wird. Bei bekannten Vorrichtungen der eingangs genannten Art sind die Zylinder in gleichem Abstand zu den Ventilsitzen nebeneinander angeordnet, und die Vorrichtung wird so gesteuert, dass immer nur eines der Nadelventile zum Materialauftrag öffnet.Such devices are used to apply viscous materials such as adhesives, sealants or paints to workpieces. Often several nozzles of different geometries mounted on the rotating lance are used, into each of which a material outlet opens. A needle valve is assigned to each material outlet, the valve needle of which closes or releases the relevant material outlet on a valve seat. Cylinders are provided for actuating the valve needles, each valve needle being connected to the piston of a cylinder which is moved by being pressurized by a fluid, in particular compressed air. In known devices of the type mentioned at the beginning, the cylinders are arranged next to one another at the same distance from the valve seats, and the device is controlled in such a way that only one of the needle valves opens for material application.
Dabei besteht ein Bedarf, den Schaltzustand der Nadelventile zu überwachen, so dass stets erkannt wird, wenn eines der Ventile geöffnet ist. Eine solche Überwachung kann bei Vorrichtungen mit nur einem Nadelventil auf einfache Weise derart verwirklicht werden, dass mit dem einzigen Kolben ein Magnet mitbewegt wird, dessen Position dann mittels eines Magnetsensors derThere is a need to monitor the switching state of the needle valves so that it is always recognized when one of the valves is open. In devices with only one needle valve, such monitoring can be implemented in a simple manner in such a way that a magnet is moved along with the single piston, the position of which is then determined by means of a magnetic sensor
Halteeinrichtung detektiert wird. Sobald die Drehlanze aber mehrere Ventile aufweist, ist eine solche Überwachung nahezu unmöglich, da die Kolben durch das ständige Verdrehen der Drehlanze bezüglich der Halteeinrichtung keine definierte Position zum Magnetsensor haben können. Dasselbe ist der Fall, wenn die Drehlanze nur ein außermittig in ihr aufgenommenes Nadelventil aufweist. Holding device is detected. However, as soon as the rotary lance has several valves, such monitoring is almost impossible, since the pistons do not have any due to the constant rotation of the rotary lance with respect to the holding device can have a defined position to the magnetic sensor. The same is the case if the rotary lance only has one needle valve received eccentrically in it.
Es ist daher Aufgabe der Erfindung, eine Vorrichtung der eingangs genannten Art derart weiterzubilden, dass sie besser überwacht werden kann. It is therefore the object of the invention to develop a device of the type mentioned at the beginning in such a way that it can be monitored better.
Diese Aufgabe wird erfindungsgemäß durch eine Vorrichtung mit den Merkmalen des Anspruchs 1 gelöst. Vorteilhafte Weiterbildungen der Erfindung sind Gegenstand der abhängigen Ansprüche. According to the invention, this object is achieved by a device having the features of claim 1. Advantageous further developments of the invention are the subject of the dependent claims.
Der Erfindung liegt der Gedanke zugrunde, alle Kolben mittels der Stößel auf ein gemeinsames Messelement einwirken zu lassen, dessen Position dann vom Sensor detektiert werden kann. Meist sind dabei mehrere Nadelventile vorhanden, deren Zylinder nebeneinander angeordnet sind, insbesondere in dem Sinne, dass sich ihre Querschnitte senkrecht zur Drehachse nicht überlappen, wobei beispielsweise die unteren und/oder die oberen Begrenzungsflächen der Kolbenkammern jeweils in einer Ebene angeordnet sind. Es ist jedoch auch möglich, dass die Drehlanze nur ein Nadelventil mit einem insbesondere außermittig bezüglich einer Mittellängsachse angeordneten Zylinder aufweist.The invention is based on the idea of allowing all pistons to act on a common measuring element by means of the tappets, the position of which can then be detected by the sensor. Usually there are several needle valves, the cylinders of which are arranged next to one another, in particular in the sense that their cross-sections do not overlap perpendicular to the axis of rotation, with, for example, the lower and / or upper boundary surfaces of the piston chambers each being arranged in one plane. However, it is also possible for the rotary lance to have only one needle valve with a cylinder, in particular arranged eccentrically with respect to a central longitudinal axis.
Das Messelement kann zumindest betreffend seine auf den Sensor wirkenden Teile rotationssymmetrisch ausgestaltet sein, so dass sich seine Wechselwirkung mit dem Sensor der Halteeinrichtung auch bei einem Verdrehen der Drehlanze bezüglich der Halteeinrichtung nicht oder nicht nennenswert ändert. Die Drehachse ist zudem zweckmäßig eine Mittellängsachse der Drehlanze bzw. des Messelements. Der mindestens eine Kolben wird vorzugsweise mittels Druckluft beaufschlagt und weist als Fail-Safe-Funktion zudem zweckmäßig eine Federbeaufschlagung auf, die ihn in eine Position drängt, in der die Ventilnadel dichtend auf dem zugehörigen Ventilsitz aufsitzt. The measuring element can be designed to be rotationally symmetrical, at least with regard to its parts acting on the sensor, so that its interaction with the sensor of the holding device does not change or does not change significantly even when the rotary lance is rotated with respect to the holding device. The axis of rotation is also expediently a central longitudinal axis of the rotary lance or of the measuring element. The at least one piston is preferably acted upon by means of compressed air and, as a fail-safe function, also expediently has a spring action which urges it into a position in which the valve needle sits sealingly on the associated valve seat.
Das Messelement kann in unterschiedlichen Ausgestaltungen ausgeführt werden. Es wird jedoch bevorzugt, dass es einen Permanentmagneten aufweist, während der Sensor ein Magnetsensor ist. Dabei wird bevorzugt, dass der Permanentmagnet die Form eines Kreisrings hat, der um die Drehachse umläuft, so dass ein Verdrehen der Drehlanze bezüglich der Halteeinrichtung keine Änderung der Wechselwirkung des Permanentmagneten mit dem Magnetsensor nach sich zieht. Insbesondere ist der Permanentmagnet axial gepolt, so dass seine Pole in axialer Richtung aufeinanderfolgen. Um teuren Magnetwerkstoff einzusparen wird bevorzugt, dass der Radius des Kreisrings mindestens 5 mal, vorzugsweise mindestens 8 mal so groß ist wie seine in radialer Richtung gemessene Dicke. Zweckmäßig weist das Messelement eine durch die Stößel beaufschlagbare Halteplatte auf, an der der Permanentmagnet befestigt ist. The measuring element can be designed in different configurations. However, it is preferred that it has a permanent magnet while the sensor is a magnetic sensor. It is preferred that the permanent magnet has the shape of a circular ring that revolves around the axis of rotation, so that a rotation of the rotary lance with respect to the holding device does not result in any change in the interaction of the permanent magnet with the magnetic sensor. In particular, the permanent magnet is axially polarized so that its poles follow one another in the axial direction. In order to save on expensive magnetic material, it is preferred that the radius of the circular ring is at least 5 times, preferably at least 8 times as large as its thickness measured in the radial direction. The measuring element expediently has a holding plate which can be acted upon by the plunger and to which the permanent magnet is fastened.
Vorzugsweise weist die Drehlanze ein Gehäuse aus nicht ferromagnetischem Material auf, in dem der mindestens eine Zylinder und das Messelement aufgenommen sind. Als Material für das Gehäuse kommt insbesondere Aluminium in Frage, das die Detektion des Permanentmagneten mittels des Magnetsensors kaum behindert. The rotary lance preferably has a housing made of non-ferromagnetic material, in which the at least one cylinder and the measuring element are accommodated. A particularly suitable material for the housing is aluminum, which hardly hampers the detection of the permanent magnet by means of the magnetic sensor.
Zweckmäßig ist das Messelement gegen eine Rückstellkraft in Richtung vom mindestens einen Zylinder weg verschieblich, so dass die Rückstellkraft dasThe measuring element is expediently displaceable against a restoring force in the direction away from at least one cylinder, so that the restoring force the
Messelement nach Wegfall der Beaufschlagung durch einen der Stößel wieder in eine Ausgangsposition zurücksetzt, die einer vom Sensor detektierten Information „alle Nadelventile geschlossen“ entspricht. Die Rückstellkraft wird zweckmäßig durch mindestens eine Druckfeder aufgebracht, die zwischen dem Messelement und einer das Gehäuse nach oben begrenzenden Gehäusedecke angeordnet ist. Die mindestens eine Druckfeder kann als Schraubenfeder ausgebildet sein. Resets the measuring element back to a starting position after one of the plungers has ceased to act upon it, which corresponds to an information "all needle valves closed" detected by the sensor. The restoring force is expediently applied by at least one compression spring which is arranged between the measuring element and a housing cover that delimits the housing at the top. The at least one compression spring can be designed as a helical spring.
Bei mehreren nebeneinander angeordneten Zylindern ist es unvermeidlich, dass die Stößel das Messelement jeweils außermittig beaufschlagen. Um ein Verkanten des Messelements im Gehäuse zu verhindern, wird dieses zweckmäßig mittels mindestens eines sich in Längsrichtung erstreckenden Führungszapfens geführt, wobei sich jeder Führungszapfen durch das Messelement erstreckt. Dabei wird bevorzugt, dass ein Führungszapfen mittig angeordnet ist, so dass sich die Drehachse durch ihn erstreckt, während weitere Führungszapfen außermittig angeordnet sein können. Zudem wird bevorzugt, dass mindestens einer der Führungszapfen mittig durch eine der Druckfedern verläuft. Weiter wird ist zweckmäßig vorgesehen, dass die Zylinder in gleichen Abständen zueinander und in gleichen Abständen zur Drehachse angeordnet sind, um eine größtmögliche Symmetrie zu erzielen. Wenn zudem jeder Stößel außermittig mit dem jeweiligen Kolben verbunden ist und näher an der Drehachse angeordnet ist als die Längsmittelachse des Kolbens, wird ein vom Stößel auf das Messelement ausgeübtes Moment reduziert, so dass die Gefahr eines Verkantens des Messelements im Gehäuse weiter verringert wird. In the case of several cylinders arranged next to one another, it is inevitable that the tappets each act eccentrically on the measuring element. In order to prevent the measuring element from tilting in the housing, it is expediently guided by means of at least one guide pin extending in the longitudinal direction, each guide pin extending through the measuring element. It is preferred that a guide pin is arranged in the middle, so that the axis of rotation extends through it, while further guide pins can be arranged off-center. It is also preferred that at least one of the guide pins runs centrally through one of the compression springs. Furthermore, it is expediently provided that the cylinders are arranged at the same distances from one another and at the same distances from the axis of rotation in order to achieve the greatest possible symmetry. If, in addition, each plunger is eccentrically connected to the respective piston and is arranged closer to the axis of rotation than the longitudinal center axis of the piston, a torque exerted by the plunger on the measuring element is reduced, so that the risk of the measuring element jamming in the housing is further reduced.
Gemäß einem bevorzugten Ausführungsbeispiel ist jeder der Druckfedern eine ihr mit einer schwächeren Rückstellkraft entgegenwirkende weitere Druckfeder zugeordnet ist, die von unten gegen das Messelement drückt. Auch die weiteren Druckfedern können vorteilhaft als Schraubenfedern ausgebildet und um die Führungszapfen angeordnet sein. Aus den Kräften der Rückstellfedern und der weiteren Rückstellfedern resultiert dann immer noch eine das Messelement in seine Ausgangsposition drängende Rückstellkraft. Das Vorsehen der weiteren Rückstellfedern hilft aber, ein Verkanten des Messelements im Gehäuse zu vermeiden. According to a preferred embodiment, each of the compression springs is assigned a further compression spring which counteracts it with a weaker restoring force and presses against the measuring element from below. The further compression springs can also advantageously be designed as helical springs and arranged around the guide pins. The forces of the restoring springs and the further restoring springs then still result in a restoring force urging the measuring element into its starting position. However, the provision of the further return springs helps to prevent the measuring element from tilting in the housing.
Im Folgenden wird die Erfindung anhand eines in der Zeichnung schematisch dargestellten Ausführungsbeispiels näher erläutert. Es zeigen Figur 1 eine Vorrichtung zum Aufträgen von viskosem Material in perspektivischer Ansicht und In the following, the invention is explained in more detail using an exemplary embodiment shown schematically in the drawing. FIG. 1 shows a device for applying viscous material in a perspective view and FIG
Figur 2a, 2b einen Teil der Vorrichtung gemäß Figur 1 im Schnitt in Seitenansicht und in perspektivischer Ansicht. 2a, 2b show a part of the device according to FIG. 1 in a sectional side view and in a perspective view.
Die in der Zeichnung dargestellte Vorrichtung 10 dient dem Aufträgen von viskosem Material auf Werkstücke, im vorliegenden Ausführungsbeispiel dem Aufträgen von Lack. Es sind jedoch auch andere Anwendungen denkbar, wie beispielsweise der Auftrag von Klebstoffen, Dichtstoffen, Dämmstoffen oder Wärmeleitpasten. Die Auftragsvorrichtung 10 weist eine Halteeinrichtung 12 auf, die zur Montage an einem Roboterarm bestimmt ist. In der Halteeinrichtung 12 ist eine Drehlanze 14 montiert, die um eine sich in einer Längsrichtung 16 erstreckende Drehachse bezüglich der Halteeinrichtung 12 drehbar ist. Die Drehlanze 14 weist an ihrem unteren Ende drei Materialauslässe 18 auf, an denen viskoses Material zum Auftrag auf ein Werkstück aus einem aus Aluminium gefertigten Gehäuse 20 der Drehlanze 14 austreten kann und an denen in der Regel jeweils eine Auftragsdüse montiert wird. Im Gehäuse 20 sind drei Nadelventile 22 aufgenommen, wobei jedes Nadelventil 22 einem der Materialauslässe 18 zugeordnet ist. Die Ventilnadeln 24 der Nadelventile 22 verschließen jeweils einen der Materialauslässe 18 an einem Ventilsitz bzw. geben den Materialauslass 18 durch Abheben vom Ventilsitz frei. Jedem der Nadelventile ist ein doppelt wirkender Pneumatikzylinder 26 zugeordnet, in dessen Kolbenkammer 28 ein Kolben 30 in der Längsrichtung 16 hin und her verschieblich ist, mit welchem die sich ebenfalls in Längsrichtung 16 erstreckende betreffende Ventilnadel 24 fest verbunden ist. Eine Bewegung des Kolbens 30 mittels Druckluftbeaufschlagung resultiert somit in einer Bewegung der Ventilnadel 24 und in einer Öffnung bzw. einem Schließen des betreffenden Materialauslasses 18 am Ventilsitz. Eine in der Kolbenkammer 28 angeordnete, als Schraubenfeder ausgebildete Schließfeder 32 drückt den jeweiligen Kolben 30 nach unten und die Ventilnadel 24 auf den zugehörigen Ventilsitz, so dass die Materialauslässe 18 bei Ausfall der Druckluft stets geschlossen sind. The device 10 shown in the drawing is used to apply viscous material to workpieces, in the present exemplary embodiment, to apply paint. However, other applications are also conceivable, such as the application of adhesives, sealants, insulating materials or heat-conducting pastes. The application device 10 has a holding device 12, which is intended for mounting on a robot arm. A rotary lance 14 is mounted in the holding device 12 and is rotatable with respect to the holding device 12 about an axis of rotation extending in a longitudinal direction 16. The rotary lance 14 has at its lower end three material outlets 18 at which viscous material for application to a workpiece can exit from a housing 20 of the rotary lance 14 made of aluminum and at which an application nozzle is usually mounted. Three needle valves 22 are accommodated in the housing 20, each needle valve 22 being assigned to one of the material outlets 18. The valve needles 24 of the needle valves 22 each close one of the material outlets 18 on a valve seat or release the material outlet 18 by lifting it off the valve seat. Each of the needle valves is assigned a double-acting pneumatic cylinder 26, in the piston chamber 28 of which a piston 30 can be moved back and forth in the longitudinal direction 16, to which the relevant valve needle 24, which also extends in the longitudinal direction 16, is firmly connected. A movement of the piston 30 by means of pressurized air thus results in a movement of the valve needle 24 and in an opening or closing of the relevant material outlet 18 on the valve seat. A closing spring 32 arranged in the piston chamber 28 and designed as a helical spring presses the respective piston 30 downwards and the valve needle 24 onto the associated valve seat, so that the material outlets 18 are always closed if the compressed air fails.
Die Vorrichtung 10 wird so gesteuert, dass stets nur ein Materialauslass 18 geöffnet wird. Um zu überwachen, ob einer der Materialauslässe 18 geöffnet ist oder ob alle Materialauslässe 18 geschlossen sind, weist die Halteeinrichtung 12 einen fest montierten Magnetsensor 34 auf. Dieser detektiert die Position eines im Gehäuse 20 der Drehlanze 14 beweglichen Messelements 36. Das Messelement 36 weist eine im Gehäuse 20 in der Längsrichtung 16 hin und her verschiebliche Halteplatte 38 und einen fest mit der Halteplatte 38 verbundenen ringförmigen Permanentmagneten 40 auf. Die Halteplatte 38 ist auf einem zentralen Führungszapfen 42 sowie auf drei äußeren Führungszapfen 44 geführt, wobei sich jeder der Führungszapfen 42, 44 durch eine Öffnung in der Halteplatte 38 erstreckt. Um jeden der Führungszapfen 42, 44 ist eine oben an einer Gehäusedecke 46 und unten an der Halteplatte 38 abgestützte Druckfeder 48, 50 angeordnet, die das Messelement 36 nach unten drückt. Dabei handelt es sich um eine um den zentralen Führungszapfen 42 angeordnete zentrale Druckfeder 48 und drei um jeweils einen der äußeren Führungszapfen 44 angeordnete äußere Druckfedern 50. Mit jedem der Kolben 30 ist ein Stößel 52 fest verbunden, der abgedichtet aus einer den Ventilsitzen abgewandten und dem Messelement 36 zugewandten Oberseite der betreffenden Kolbenkammer 28 herausgeführt ist und an der Halteplatte 38 anliegt. Wird einer der Materialauslässe 18 durch Anheben des betreffenden Kolbens 30 geöffnet, so drückt der mit diesem Kolben 30 verbundene Stößel 52 das Messelement 46 nach oben, so dass der Magnetsensor 34 die Bewegung des Permanentmagnets 40 detektieren kann. Der Magnetsensor 34 erzeugt dann ein Signal „Ventil offen“. Wird der Materialauslass 18 durch Absenken des betreffenden Kolbens 30 wieder geschlossen, so bewirken die Druckfedern 48, 50 ein Absenken des Messelements 36, das vom Magnetsensor 34 detektiert wird, welcher ein Signal „Ventile geschlossen“ erzeugt. The device 10 is controlled in such a way that only one material outlet 18 is opened at a time. In order to monitor whether one of the material outlets 18 is open or whether all material outlets 18 are closed, the holding device 12 has a permanently mounted magnetic sensor 34. This detects the position of a movable measuring element 36 in the housing 20 of the rotary lance 14. The measuring element 36 has a holding plate 38 which can be moved back and forth in the longitudinal direction 16 in the housing 20 and an annular permanent magnet 40 firmly connected to the holding plate 38. The holding plate 38 is guided on a central guide pin 42 and on three outer guide pins 44, each of the guide pins 42, 44 extending through an opening in the holding plate 38 extends. A compression spring 48, 50 which is supported on a housing cover 46 at the top and on the holding plate 38 at the bottom and presses the measuring element 36 downward is arranged around each of the guide pins 42, 44. These are a central compression spring 48 arranged around the central guide pin 42 and three outer compression springs 50 each arranged around one of the outer guide pins 44 The upper side of the piston chamber 28 in question facing the measuring element 36 is led out and rests against the holding plate 38. If one of the material outlets 18 is opened by lifting the relevant piston 30, the plunger 52 connected to this piston 30 pushes the measuring element 46 upwards so that the magnetic sensor 34 can detect the movement of the permanent magnet 40. The magnetic sensor 34 then generates a “valve open” signal. If the material outlet 18 is closed again by lowering the relevant piston 30, the compression springs 48, 50 lower the measuring element 36, which is detected by the magnetic sensor 34, which generates a signal “valves closed”.
Die Zylinder 26 sind nebeneinander angeordnet in dem Sinne, dass ihre senkrecht zur Längsrichtung 16 angefertigten Querschnitte sich nicht überlappen. Eine Beaufschlagung des Messelements 36 mittels der Stößel 52 kann somit nicht zentral erfolgen, also mittig an der Halteplatte 38. Um ein Verkanten des Messelements 36 im Gehäuse 20 zu vermeiden, sind die Stößel 52 außermittig an den Kolben 30 angeordnet und soweit wie möglich in Richtung zur Mitte der Halteplatte 38 bzw. in Richtung zur Mittellängsachse der Drehlanze 14 versetzt. Zudem liegt jeder der Druckfedern 48, 50 eine weitere, schwächere Druckfeder 48‘, 50' gegenüber, die von unten gegen die Halteplatte 38 drückt. Die Druckfedern 48, 50 und die weiteren Druckfedern 48‘, 50' sind dabei so dimensioniert, dass jedes Paar bestehend aus einer der Druckfedern 48, 50 und der gegenüberliegenden weiteren Druckfeder 48‘, 50' in der Summe eine Kraft auf die Halteplatte 38 ausübt, die nach unten, also in Richtung auf die Zylinder 26 zu, gerichtet ist. Im gezeigten Ausführungsbeispiel weist die Drehlanze 14 drei Nadelventile 22 auf. Es versteht sich von selbst, dass die Drehlanze 14 mit einem, zwei oder mehr als drei Nadelventilen 22 ausgestattet sein kann. The cylinders 26 are arranged next to one another in the sense that their cross-sections made perpendicular to the longitudinal direction 16 do not overlap. A loading of the measuring element 36 by means of the plunger 52 can therefore not take place centrally, i.e. in the middle of the holding plate 38. To avoid tilting of the measuring element 36 in the housing 20, the plungers 52 are arranged eccentrically on the piston 30 and as far as possible in the direction offset to the center of the holding plate 38 or in the direction of the central longitudinal axis of the rotary lance 14. In addition, opposite each of the compression springs 48, 50 is a further, weaker compression spring 48 ', 50' which presses against the holding plate 38 from below. The compression springs 48, 50 and the further compression springs 48 ', 50' are dimensioned in such a way that each pair consisting of one of the compression springs 48, 50 and the opposite further compression spring 48 ', 50' exerts a total force on the holding plate 38 , which is directed downward, that is, in the direction of the cylinder 26. In the exemplary embodiment shown, the rotary lance 14 has three needle valves 22. It goes without saying that the rotary lance 14 can be equipped with one, two or more than three needle valves 22.
Zusammenfassend ist folgendes festzuhalten: Die Erfindung betrifft eine Vorrichtung 10 zum Aufträgen von viskosem Material auf Werkstücke mit einer in einer Halteeinrichtung 12 um eine in einer Längsrichtung 16 verlaufende Drehachse drehbar angeordneten Drehlanze 14, die mindestens einen Materialauslass 18 aufweist, wobei jedem Materialauslass 18 ein Nadelventil 22 zugeordnet ist, mittels dessen sich in der Längsrichtung 16 erstreckender Ventilnadel 24 der jeweilige Materialauslass 18 an einem Ventilsitz verschließbar ist, und wobei jeder Ventilnadel 24 ein Zylinder 26 zugeordnet ist, in dessen Kolbenkammer 28 ein Kolben 30 durch Druckbeaufschlagung mittels eines Fluids beweglich ist, mit dem die Ventilnadel 24 fest verbunden ist. Erfindungsgemäß ist vorgesehen, dass mit jedem Kolben 30 ein Stößel 52 verbunden ist, der auf der dem mindestens einen Ventilsitz abgewandtenIn summary, the following can be stated: The invention relates to a device 10 for applying viscous material to workpieces with a rotary lance 14 which is rotatably arranged in a holding device 12 about an axis of rotation running in a longitudinal direction 16 and which has at least one material outlet 18, with each material outlet 18 having a needle valve 22 is assigned, by means of which valve needle 24 extending in the longitudinal direction 16, the respective material outlet 18 can be closed on a valve seat, and each valve needle 24 is assigned a cylinder 26, in the piston chamber 28 of which a piston 30 is movable by being pressurized by a fluid, with which the valve needle 24 is firmly connected. According to the invention, it is provided that a tappet 52 is connected to each piston 30 and is located on the valve seat facing away from the at least one valve seat
Oberseite abgedichtet aus der betreffenden Kolbenkammer 28 herausgeführt ist, dass die Drehlanze 14 ein mittels der Stößel 52 beaufschlagbares, in Längsrichtung 16 verschiebliches Messelement 36 aufweist und dass die Halteeinrichtung 12 einen Sensor 34 zur Bestimmung der Position des Messelements 36 aufweist. The top is sealed out of the relevant piston chamber 28, that the rotary lance 14 has a measuring element 36 that can be acted upon by means of the plunger 52 and is displaceable in the longitudinal direction 16, and that the holding device 12 has a sensor 34 for determining the position of the measuring element 36.

Claims

Ansprüche Expectations
1. Vorrichtung zum Aufträgen von viskosem Material auf Werkstücke mit einer in einer Halteeinrichtung (12) um eine in einer Längsrichtung (16) verlaufende Drehachse drehbar angeordneten Drehlanze (14), die mindestens einen Materialauslass (18) aufweist, wobei jedem Materialauslass (18) ein Nadelventil (22) zugeordnet ist, mittels dessen sich in der Längsrichtung (16) erstreckender1. Apparatus for applying viscous material to workpieces with a rotating lance (14) which is rotatably arranged in a holding device (12) about an axis of rotation in a longitudinal direction (16) and has at least one material outlet (18), each material outlet (18) a needle valve (22) is assigned, by means of which in the longitudinal direction (16) extending
Ventilnadel (24) der jeweilige Materialauslass (18) an einem Ventilsitz verschließbar ist, und wobei jeder Ventilnadel (24) ein Zylinder (26) zugeordnet ist, in dessen Kolbenkammer (28) ein Kolben (30) durch Druckbeaufschlagung mittels eines Fluids beweglich ist, mit dem die Ventilnadel (24) fest verbunden ist, dadurch gekennzeichnet, dass mit jedem Kolben (30) ein Stößel (52) verbunden ist, der auf der dem mindestens einen Ventilsitz abgewandten Oberseite abgedichtet aus der betreffenden Kolbenkammer (28) herausgeführt ist, dass die Drehlanze (14) ein mittels der Stößel (52) beaufschlagbares, in Längsrichtung (16) verschiebliches Messelement (36) aufweist und dass die Halteeinrichtung (12) einen Sensor (34) zur Bestimmung der Position des Messelements (36) aufweist. Valve needle (24) the respective material outlet (18) can be closed on a valve seat, and each valve needle (24) is assigned a cylinder (26), in the piston chamber (28) of which a piston (30) can be moved by being pressurized by a fluid, with which the valve needle (24) is firmly connected, characterized in that a plunger (52) is connected to each piston (30) and is sealed out of the relevant piston chamber (28) on the upper side facing away from the at least one valve seat, that the rotary lance (14) has a measuring element (36) that can be acted upon by means of the plunger (52) and is displaceable in the longitudinal direction (16) and that the holding device (12) has a sensor (34) for determining the position of the measuring element (36).
2. Vorrichtung nach Anspruch 1 , dadurch gekennzeichnet, dass die Drehlanze (14) mindestens zwei Materialauslässe (18) aufweist. 2. Device according to claim 1, characterized in that the rotary lance (14) has at least two material outlets (18).
3. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass das Messelement (36) einen Permanentmagneten (40) aufweist und dass der Sensor (34) ein Magnetsensor ist. 3. Device according to claim 1 or 2, characterized in that the measuring element (36) has a permanent magnet (40) and that the sensor (34) is a magnetic sensor.
4. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, dass der Permanentmagnet (40) die Form eines vorzugsweise axial gepolten Kreisrings hat, der um die Drehachse umläuft und dessen Radius vorzugsweise mindestens 5 mal, insbesondere mindestens 8 mal so groß ist wie seine in radialer Richtung gemessene Dicke. 4. The device according to claim 3, characterized in that the permanent magnet (40) has the shape of a preferably axially polarized circular ring which rotates around the axis of rotation and whose radius is preferably at least 5 times, in particular at least 8 times as large as its in the radial direction measured thickness.
5. Vorrichtung nach Anspruch 3 oder 4, dadurch gekennzeichnet, dass das Messelement (36) eine durch die Stößel (52) beaufschlagbare Halteplatte (38) aufweist, an der der Permanentmagnet (40) befestigt ist. 5. Apparatus according to claim 3 or 4, characterized in that the measuring element (36) has a holding plate (38) which can be acted upon by the plunger (52) and to which the permanent magnet (40) is attached.
6. Vorrichtung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die Drehlanze (14) ein Gehäuse (20) aus nicht ferromagnetischem Material aufweist, in dem der mindestens eine Zylinder (26) und das Messelement (36) aufgenommen sind. 6. Device according to one of the preceding claims, characterized in that the rotary lance (14) has a housing (20) made of non-ferromagnetic material in which the at least one cylinder (26) and the measuring element (36) are received.
7. Vorrichtung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass das Messelement (36) gegen eine Rückstellkraft in Richtung vom mindestens einen Zylinder (26) weg verschieblich ist. 7. Device according to one of the preceding claims, characterized in that the measuring element (36) can be displaced away against a restoring force in the direction of the at least one cylinder (26).
8. Vorrichtung nach Anspruch 6 und nach Anspruch 7, dadurch gekennzeichnet, dass die Rückstellkraft durch mindestens eine Druckfeder (48, 50) aufgebracht wird, die zwischen dem Messelement (36) und einer das Gehäuse (20) nach oben begrenzenden Gehäusedecke (46) angeordnet ist. 8. The device according to claim 6 and claim 7, characterized in that the restoring force is applied by at least one compression spring (48, 50) which between the measuring element (36) and a housing cover (46) delimiting the housing (20) at the top. is arranged.
9. Vorrichtung nach Anspruch 8, dadurch gekennzeichnet, dass jeder der9. The device according to claim 8, characterized in that each of the
Druckfedern (48, 50) eine ihr mit einer schwächeren Rückstellkraft entgegenwirkende weitere Druckfeder (48‘, 50‘) zugeordnet ist, die von unten gegen das Messelement (36) drückt. Associated with compression springs (48, 50) is a further compression spring (48, 50 ‘) which counteracts it with a weaker restoring force and presses against the measuring element (36) from below.
10. Vorrichtung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass das Messelement (36) mittels mindestens eines sich in Längsrichtung erstreckenden Führungszapfens (42, 44) geführt ist, wobei sich jeder Führungszapfen (42, 44) durch das Messelement (36) erstreckt. 10. Device according to one of the preceding claims, characterized in that the measuring element (36) is guided by means of at least one longitudinally extending guide pin (42, 44), each guide pin (42, 44) extending through the measuring element (36) .
11. Vorrichtung nach Anspruch 8 oder 9 und nach Anspruch 10, dadurch gekennzeichnet, dass mindestens einer der Führungszapfen (42, 44) mittig durch eine der Druckfedern (48, 50) und gegebenenfalls durch eine der weiteren Druckfedern (48‘, 50‘) verläuft, wobei die betreffende Druckfeder (48, 50) bzw. weitere Druckfeder (48‘, 50‘) als Schraubenfeder ausgebildet ist. 11. The device according to claim 8 or 9 and according to claim 10, characterized in that at least one of the guide pins (42, 44) is centered by one of the compression springs (48, 50) and optionally by one of the further compression springs (48 ', 50') runs, the relevant compression spring (48, 50) or further compression spring (48 ', 50') being designed as a helical spring.
12. Vorrichtung nach einem der Ansprüche 2 bis 11, dadurch gekennzeichnet, dass die Zylinder (26) in gleichen Abständen zueinander und in gleichen Abständen zur Drehachse angeordnet sind. 12. Device according to one of claims 2 to 11, characterized in that the cylinders (26) are arranged at the same intervals from one another and at the same intervals from the axis of rotation.
13. Vorrichtung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass jeder Stößel (52) außermittig mit dem jeweiligen Kolben (30) verbunden ist und näher an der Drehachse angeordnet ist als die Längsmittelachse des Kolbens (30). 13. Device according to one of the preceding claims, characterized in that each tappet (52) is eccentrically connected to the respective piston (30) and is arranged closer to the axis of rotation than the longitudinal center axis of the piston (30).
EP21702674.9A 2020-02-05 2021-02-01 Device for applying viscous material to workpieces Active EP4076770B1 (en)

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US4842162A (en) 1987-03-27 1989-06-27 Nordson Corporation Apparatus and method for dispensing fluid materials using position-dependent velocity feedback
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US4944243A (en) 1989-06-21 1990-07-31 Taise Corporation Apparatus for automatically painting external wall of building
DE10345840A1 (en) * 2003-09-30 2005-04-14 Sca Schucker Gmbh & Co. Kg Device for applying a fluid to the surface of a workpiece used in vehicle construction and in furniture manufacture comprises a feed channel which communicates with a return channel via a distribution path arranged within a shaft
DE102012012360A1 (en) 2012-06-22 2013-12-24 Sca Schucker Gmbh & Co. Kg Device for applying a pasty mass
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