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
  • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
  • B05C11/10—Storage, supply or control of liquid or other fluent material; Recovery of excess liquid or other fluent material
  • B05C11/1002—Means for controlling supply, i.e. flow or pressure, of liquid or other fluent material to the applying apparatus, e.g. valves
  • B05C11/1034—Means for controlling supply, i.e. flow or pressure, of liquid or other fluent material to the applying apparatus, e.g. valves specially designed for conducting intermittent application of small quantities, e.g. drops, of coating material
• • 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
  • B05B12/08—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means
  • B05B12/082—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means responsive to a condition of the discharged jet or spray, e.g. to jet shape, spray pattern or droplet size
• • 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
  • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
  • B05C11/10—Storage, supply or control of liquid or other fluent material; Recovery of excess liquid or other fluent material
  • B05C11/1002—Means for controlling supply, i.e. flow or pressure, of liquid or other fluent material to the applying apparatus, e.g. valves
  • B05C11/1007—Means for controlling supply, i.e. flow or pressure, of liquid or other fluent material to the applying apparatus, e.g. valves responsive to condition of liquid or other fluent material
  • B05C11/1013—Means for controlling supply, i.e. flow or pressure, of liquid or other fluent material to the applying apparatus, e.g. valves responsive to condition of liquid or other fluent material responsive to flow or pressure of liquid or other fluent material
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
  • G01N21/84—Systems specially adapted for particular applications
  • G01N21/85—Investigating moving fluids or granular solids
• • G—PHYSICS
  • G02—OPTICS
  • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
  • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
  • G02B6/24—Coupling light guides
  • G02B6/36—Mechanical coupling means
  • G02B6/3628—Mechanical coupling means for mounting fibres to supporting carriers
  • G02B6/3632—Mechanical coupling means for mounting fibres to supporting carriers characterised by the cross-sectional shape of the mechanical coupling means
  • G02B6/3636—Mechanical coupling means for mounting fibres to supporting carriers characterised by the cross-sectional shape of the mechanical coupling means the mechanical coupling means being grooves
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
  • G01N21/01—Arrangements or apparatus for facilitating the optical investigation
  • G01N21/03—Cuvette constructions
  • G01N2021/0346—Capillary cells; Microcells
  • G01N2021/035—Supports for sample drops
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
  • G01N21/84—Systems specially adapted for particular applications
  • G01N21/85—Investigating moving fluids or granular solids
  • G01N2021/8557—Special shaping of flow, e.g. using a by-pass line, jet flow, curtain flow
  • G01N2021/8564—Sample as drops

Definitions

• the invention relates to a guide system for detection devices, in particular for metering devices.
• the invention further relates to detection devices or metering devices provided with such a guidance system and to a method for constructing a detection device with such a guidance system.
• electromagnetic radiation can be used, which is guided by means of signal conductors up to the nozzle opening.
• signal conductors up to the nozzle opening.
• light signals to this nozzle opening and from there in turn light signals are passed to a detection unit and from a change in the signals can be closed to the dispensed drops (under certain circumstances even on the Dosierstoffmenge).
• EP 1 946 843 A1 An example of this is shown in EP 1 946 843 A1.
• several optical fiber detectors are used, which are located at different distances from the nozzle along the trajectory of the drops.
• an elongate cylindrical tube is arranged on or in front of the nozzle, through which the straight-line trajectory of the droplets runs along the longitudinal axis of the tube.
• In the cylinder wall of this tube are located at the desired positions radially extending Through holes into which the light guides are inserted with their ends and fixed, eg glued, become.
• Object of the present invention is to provide an improved guide system and a corresponding detection device and a metering device and an improved method for constructing a detection device, in particular for SMT metering available.
• the guide system according to the invention is designed for detection devices, which in turn is suitable for monitoring emerging from a nozzle opening of a metering device, as described above.
• the management system is In this case, a (virtual) nozzle opening area is assigned to the arrangement at the nozzle opening or the guide system has such a (virtual) nozzle opening area.
• the guide system comprises at least one material body, in which at least two guide channels are formed. These guide channels are designed to guide signal conductors of the detection device to the nozzle opening region over a certain distance, ie not only to hold it at the end, as in the cited prior art.
• the end regions of two guide channels are arranged with respect to their central axes substantially on a common straight line to each other and with respect to the nozzle opening region to each other opposite.
• the guide channels ensure that the signals or signal conductors are safely guided correctly to the nozzle opening area and thus to the nozzle opening or from there.
• the leadership over a long distance, z. B. of at least 10 mm, more preferably 20 mm or even more. That a guide channel has z. B. accordingly, the length. Correct positioning or guidance makes the detection of drops emerging from the nozzle safer by means of the detection device. Signal conductors can - as explained later - be easily positioned at the nozzle opening and also easier to replace.
• center axis used with reference to a guide channel refers to that axis which always follows the course of the guide channel, continues straight at the end regions and always similar to the neutral fiber (zero line) of a body with symmetrical cross section in the middle of the cross section the guide channel runs.
• nozzle opening area refers to the area which is directly related to the position at which the nozzle opening is located when the guide system is attached to a metering device as intended. The nozzle opening area is therefore also directly at the position at which the nozzle opening is located at the intended attachment of the corresponding guide system to a metering device, ie as close to the nozzle as possible at the exact location of the nozzle opening itself.
• opposite means that the end areas are preferably substantially diametrically opposite, where “substantially” means, in particular, that the maximum distance of the center axes of both opposing guide channels from a substantially rectilinear emission direction in which the dosing agent, e.g. B.
• the drops to move out of the nozzle not more than the diameter, preferably not more than the radius, the intended nozzle opening.
• at least one of the central axes, preferably both central axes, preferably intersects the axis of this emission direction emerging from the nozzle opening (which could also be referred to as "injection trajectory").
• the detection device for monitoring substance emerging from a nozzle opening of a metering device has a signal transmission unit, a signal reception unit and a signal evaluation unit, and a guidance system according to the invention. Through the guide channels of the guide system signals or signal conductors can run.
• the signal transmission unit may be arranged to send signals through the guide channels or the signal conductors, and the signal reception unit may be arranged to receive these signals passing through the guide channels or the signal conductors.
• the guide system according to the invention can be mounted on or on a metering device or be arranged together with this on a common support, so that the nozzle of the metering device is arranged with its nozzle opening at the position of the nozzle opening portion of the guide system to a to carry out the correct measurement.
• the metering device according to the invention comprises an inventive guide system or a detection device according to the invention.
• the guide system according to the invention can thus also be an integral part of the metering device.
• the method according to the invention for constructing a corresponding detection device comprises at least the following steps:
• a guide system which, as described above, is associated with a nozzle opening area for placement at a nozzle opening of the metering device and which comprises at least one body of material having formed therein at least two guide channels adapted to guide signal conductors to the nozzle opening area.
• At least two signal conductors can then be inserted into the guide channels of the guide system, so that the ends of the signal conductors are positioned in the end regions of the guide channels.
• signals of a signal conductor can Nozzle opening to pass through the air and it can then the light signals, possibly in a modified form, are detected in the other signal conductor.
• the end regions of the guide channels should be matched to one another, as is required with respect to the guide system according to the invention. It is preferred that in the case of use of optical fibers they are stripped in the region of their expected course in the guide channels and extend in this stripped state in the guide channels.
• the signal conductors are connected at the end facing away from the nozzle with elements for measurement.
• an end of one of the signal conductors is connected to a signal transmitting unit and the end of another of the signal conductors facing away from the nozzle is connected to a signal receiving unit.
• the signal transmission unit may transmit signals through the one signal conductor for measurement. These traverse the space in front of the nozzle opening as described above, fall into the other signal conductor, possibly modified or modulated, and strike the signal receiving unit, which detects the signals and then processes these detected signals for further processing, in particular electronically Provides.
• the arrangement of the guide system on the other components of the metering device or a common holder can preferably be done with already inserted optical fibers, possibly also together with the signal transmission unit and / or the signal receiving unit. This is preferably done with a quick coupling device.
• a dosing agent for which this invention is designed or which are part of the invention, as mentioned deliberately encounter a dosing agent, for.
• a powder or a fluid through which Nozzle opening preferably a viscous substance such as glue. This process can generally be referred to as “emission” and is also referred to below as “embossing” or the like.
• the injection can take place both on a trajectory (eg droplet jet) and as a cone-shaped or differently shaped droplet distribution (eg a spray mist), it makes sense to introduce the concept of the "resulting injection direction" It is also useful for the understanding to define a coordinate system for the metering device, at the origin of which the nozzle orifice is located, and the above resulting injection direction is opposite to the Z axis (the injection trajectory then runs exactly opposite to the Z axis), the X and Y axes lying on a plane orthogonal to the Z axis If the XY plane should have a longer side, the X axis is preferably defined to be 1K Along this longer side and the Y axis is orthogonal to it.
• the above-defined position of the nozzle opening area at the intended position of the nozzle opening is then to be understood according to this coordinate system such that both the nozzle opening and the nozzle opening area are located at the origin of this coordinate system.
• the guide channels are on their lateral surfaces of the wall at least partially, but preferably over the entire area, enclosed, so that the signals or signal conductors are completely protected and z.
• B. optical fiber can be used without an additional sheath.
• a guide channel is hollow throughout in order to be able to record a signal conductor optimally.
• the end faces of the guide channels can be closed, this closure must be permeable to the signals in this case.
• transparent windows can transmit light signals.
• the end faces of the guide channels are preferably open.
• the guide channels preferably have a constant cross section over their length, at least up to the end regions. This has the advantage that signal conductors are easy in pushed the guide channels and thus an assembly of the guide system with signal conductors or a replacement of signal conductors can be easily made.
• the cross-sectional areas of the mutually facing end sides of two guide channels are aligned orthogonal to their respective central axes.
• the guide channels can be designed so that they can serve as a waveguide, so you can conduct your own electromagnetic waves on the principle of hollow conduit. This would require no additional signal conductors.
• the cross-sectional area of the guide channels preferably has the shape of a regular polygon, an ellipse or a circle.
• the cross-sectional shape of the guide channels corresponds to those of the intended signal conductors or signal line paths. This would allow use of common signal conductors, in particular conventional optical waveguides.
• At least a part of a guide channel is formed as a recess in a block of material.
• at least a part of a guide channel is formed in a tube.
• a guide channel is partially formed in a tube and partially in a block of material.
• the tube can additionally surround or replace the jacket present in the case of a light guide or other signal conductor, if necessary also only in sections, and is not to be equated with this
• the latter is subdivided into at least two segments (for example material block parts) whose cutting or fitting surfaces follow the lines of the guide channels and preferably separate them along the central axis. In this way, for example, a simple milling of the guide channels is possible.
• the material block with the introduced guide channels in an additive manufacturing process, eg. B. by means of a 3D printer.
• the guide system has an opening in the area of the nozzle opening area, so that dripped droplets can pass through the guide system in the nozzle opening area without interference or, preferably, a nozzle can be arranged in this opening.
• the edges of the opening are designed so that inserted signal conductors or a nozzle arranged there form the lowest point with respect to the Z coordinate defined above. Preferably, this is achieved with a conical taper of the edges of the opening. This simplifies a cleaning of the nozzle, z. B. by means of cleaning tapes or cleaning swabs.
• At least one guide channel in itself ie, the wall of the guide channel is itself rigid and stiff
• at least one guide channel in itself ie, the wall of the guide channel is itself rigid and stiff
• at least one guide channel in itself ie, the wall of the guide channel is itself rigid and stiff
• at least one guide channel in itself ie, the wall of the guide channel is itself rigid and stiff
• at least one guide channel in itself ie, the wall of the guide channel is itself rigid and stiff
• a number of stabilizing elements so that the end portion of the guide channel relative to the nozzle opening area substantially does not move and preferably the guide channel also not deformed.
• a guide channel is always immovable, that at least in the nozzle opening region end region, preferably the last 2 cm or the last cm of the guide channel, in a lateral (ie transverse to the central axis of the guide channel) force of 1 N not more than 1 mm is deflected from its original shape, preferably not more than 0.1 mm.
• Preferred materials for the walls of the guide channels or the guide system are materials of the group plastic, metal, ceramic and glass.
• the distance of the center axis of the nozzle opening region facing end portion of a guide channel, in particular each corresponding end portion of an opposite guide channel pair of the nozzle opening area is preferably dimensioned with respect to the Z coordinate that it is not more than the inner diameter of the guide channel, preferably not more than 3/4 this inner diameter or even not more than half the inner diameter is.
• the signal conductor would overlap or at least touch a point with respect to a projection on the Z-axis (or a plane including the Z-axis) with the nozzle opening.
• this distance in the Z direction from the nozzle is not greater than 1 mm, preferably not greater than 0.5 mm. This has the advantage that a drop from the nozzle does not have to cover a great distance until it is measured, which increases the measuring accuracy and the drop placement.
• the signal conductors need not necessarily be part of the device, it may still be advantageous if the signal conductors are part of the guide system and are arranged in the guide channels. You can finish flush with the guide channels at the nozzle opening area, but in some other embodiment also survive something. It may also be advantageous that they reach up to the nozzle opening.
• Preferred signal conductors are optical fibers, z.
• - a permissible operating temperature between -55 ° C and 70 ° C, preferably up to 105 ° C;
• glass fibers are used which have one or more of the following properties: - an outer diameter between 0.2 to 1 mm, preferably between 0.25 and 0.7 mm;
• - a permissible operating temperature between -65 ° C and 70 ° C, preferably up to 125 ° C;
• the inner diameter (or the channel diameter) of the guide channels should be greater than the outer diameter of the intended purpose signal conductor.
• this inner diameter is greater than 0.01 mm, more preferably greater than 0.1 mm, as the outer diameter of the signal conductor to allow easy passage of the signal conductors through the guide channels.
• the difference between the inner diameter of the guide channels and outer diameter of the signal conductor is less than 0.5 mm, more preferably less than 0.15 mm, to avoid uncontrolled lateral displacement of an inserted signal conductor.
• Preferred inner diameters are between 0.1 mm and 10 mm.
• the inner diameter of a guide channel in the end region facing the nozzle opening region is preferably smaller than the inner diameter of the remaining guide channel, but larger than the outer diameter of the intended purpose signal conductor.
• This inner diameter is preferably at least 0.005 mm, particularly preferably at least 0.05 mm, larger than the outer diameter of these signal conductors, in order to allow a sliding, but preferably not more than 0.2 mm, particularly preferably not more than 0.09 mm, greater than this outer diameter, to achieve accurate positioning of an inserted signal conductor.
• the end region of a guide channel facing the nozzle opening region can also, preferably within the last cm, have an elastic layer on the inside of its wall.
• the inner diameter of the channel can preferably correspond there maximally to the outer diameter of the intended signal conductor or even be smaller by up to 0.1 mm, wherein the signal conductor can of course still be pushed through. This has the advantage that an inserted signal conductor is held and stabilized by the elastic wall. All signal conductor outer diameters refer to the state of the signal conductors as they are inserted into the guide channels, ie when they are inserted with a jacket, this applies to the outer diameter of the shell or, if they are stripped, for the outer diameter of the stripped signal conductor.
• the guide system, the detection device or the dosing device additionally holding elements for fixing a signal transmission unit and a signal receiving unit.
• the holding elements are preferably arranged relative to the guide channels so that the signal transmitting unit and the signal receiving unit with the respective emerging from the guide channels signal conductors are connectable.
• LEDs / laser diodes and photodiodes o. ⁇ . be attached.
• the guide system, the detection device and / or the dosing device comprise a coating at least in the region of a guide channel, preferably a coating with a lower frictional resistance than the base material of the wall and / or a coating with a higher hardness than the base material of the wall.
• the coating preferably comprises materials from the group Teflon, graphite, diamond, nickel, carbide, aluminum oxide, ceramics and glass.
• the guide system preferably has a strain relief for a signal conductor arranged in a guide channel.
• a strain relief is preferably located in an end region of the guide channel remote from the nozzle opening.
• the strain relief may comprise at least one locking element for locking the signal conductor in the guide channel.
• the locking element causes blocking of the pulling out and pushing in of the signal conductors with respect to the guide channel.
• the strain relief by means of locking elements in the form of screws and / or clamping elements, particularly preferably resilient and / or spring-loaded clamping elements, take place.
• the locking elements may preferably also be formed as pushbuttons, the pushing down when pushing Allow signal conductors and block a move when released.
• the guide system has elements that prevent inadvertent release of the locking elements of the guide system.
• this strain relief can be designed so that a signal conductor jacket fixed thereto, in particular clamped, can be. A train on the jacketed signal conductor outside the guide channel then has a weakened, advantageously no effect on the position of the inserted into the guide channel stripped part or core of the signal conductor.
• the end region of a guide channel facing the nozzle opening region can also be designed as a type of strain relief.
• this end portion may be formed as a kind of slotted channel or as a slotted tube, wherein the slit width after insertion of the optical fiber can be somewhat reduced to clamp the optical fiber therein.
• a clamping takes place on at least a length of about 0.5 cm.
• the guide system is configured such that the guide channels extend in a state mounted on the dosing device on the same side on the dosing device on which the signal transmission unit and the signal reception unit of the detection device are arranged.
• the guide channels extend in a state mounted on the dosing device on the same side on the dosing device on which the signal transmission unit and the signal reception unit of the detection device are arranged.
• a guide channel or the guide channels are preferably curved, d. H. they have curves along which the respective light guide is then guided in the guide channel. Curves in a guide channel are preferably designed so that they do not fall below the intended minimum bending radius of the signal conductor provided for this guide channel. Preferred bending radii are greater than 5 mm, preferably greater than 15 mm. For reasons of saving space, preferred bending radii are smaller than 120 mm, preferably smaller than 80 mm.
• At least one guide channel Preferably, at least one guide channel, more preferably each of at least two guide channels, thereby two adjacent curves.
• These curves can - depending on the specific training and spatial arrangement of Dosing device - preferably located in a plane, preferably in the manner of an S-curve, or in two mutually tilted spatial planes.
• a curved arrangement is advantageous on any guide systems for a detection device for monitoring material emerging from a nozzle opening of a metering device, which have a nozzle opening region for arrangement at the nozzle opening and comprise at least one material body in which at least two guide channels are designed, which are designed Lead signal conductor of the detection device to the nozzle opening area.
• the angles are preferably substantially identical in magnitude but opposite, d. H. that the course of the guide channel is displaced parallel by the curve formation in the plane.
• the two spatial planes are very particularly preferably inclined to each other at an angle between 45 ° and 135 °. Preferably, they are substantially orthogonal to each other (possibly with a maximum deviation of +/- 20%).
• the curve closest to the end region of the guide channel preferably extends in a plane orthogonal to the emission direction of material emerging from the nozzle and the curve adjacent thereto preferably a plane parallel to this emission direction. If one considers the coordinate system described above, then that curve which is closest to the end region facing the nozzle opening region runs, preferably in one Plane which is tilted by up to 20 °, preferably up to 15 °, more preferably about 1 1 ° to the X-Y plane. This tilting is preferably carried out around the common straight line (the central axes of the end regions of the guide channels), in the direction of the nozzles remote ends of the guide channels.
• the structure can be particularly space-saving.
• the guide system or a detection system comprising this guide system preferably has a quick-coupling device for mounting the guide system or the detection device to a further component (for example a nozzle block or the like) of a metering device.
• This quick coupling device is particularly preferably designed so that it can be operated without tools, ie that an operator can mount and remove the guide system or the detection device on the further component of the dosing device quickly and without tools. In the case of a fault, a particularly rapid restoration of the functionality of the detection device or dosing device can thus be achieved.
• the quick coupling means comprises elements of the group of guide holes, guide pins, screw threads and screws.
• thumbscrews are preferred, since they allow a slight solution of the screw connection and / or clamping connection without tools.
• the pins and locking holes are preferably arranged so that they positively interlock with a correct positioning of the nozzle opening area at the nozzle opening or the threads and screws are preferably arranged according to that with a correct positioning of the (virtual) nozzle opening portion of the guide system at the nozzle opening a Screw connection or clamping can be made.
• the quick coupling device for implementation in the form of a clamping device comprise at least one holding element, for. B. a jaw, a holding finger or the like.
• the guide system a special shape of at least a pipe section or a part of a block of material, for. To form a jaw or the like.
• the guide system could then be clamped by tightening a screw or other fastener with said component of the metering device.
• part of the guide system with the quick-coupling device is particularly preferably designed so that a structure of the dosing system or its component can be at least partially included.
• the detection device is designed as a drop detection device for detecting drops emerging from a nozzle.
• the detection device has the following features:
• a signal transmission unit which is set up to generate a carrier signal with a defined pulse frequency
• a modulation unit which is set up by a physical
• an evaluation unit which is set up to determine, taking into account the defined pulse rate on the basis of the measurement signal, whether a drop of the
• the drop detection device is preferably designed such that a delivery of a drop in a defined time window is checked, which is synchronized with a drop delivery control of the nozzle. It preferably has a demodulation unit which is set up to perform an amplitude demodulation of the measurement signal and / or a quadrature demodulation of the measurement signal in order to determine an in-phase component and a quadrature component.
• the evaluation unit preferably comprises a modulation value determination unit which is set up, preferably based on the in-phase component and the quadrature component, to determine the magnitude of the amplitude and / or the phase of a modulation signal based on the modulated measurement signal.
• the modulation value determination unit is configured to determine amplitude derivative values (dA / dt) comprising the time derivative of the magnitude of the amplitude and / or phase derivative values (dcp / dt) comprising the time derivative of the phase of the modulation signal preferably in a fixed time interval a predetermined number of the amplitude derivative values (dA dt) are combined into amplitude comparison values and / or a predetermined number of the phase derivative values (dcp / dt) are combined into phase comparison values, or in a fixed time interval Interval a predetermined number of maximum values of the amplitude derivative values (dA / dt) to amplitude comparison values and / or a predetermined number of maximum values of the phase derivative values (dcp / dt) are combined to phase comparison values.
• the evaluation device preferably comprises a detection filter unit which is set up to determine on the basis of the amplitude comparison values and / or the phase comparison values whether the modulation signal indicates a drop, wherein the detection filter unit is preferably set up to provide a relative deviation of one of the Determine the modulation value determination unit determined amplitude comparison value of an amplitude reference value and / or to determine a relative deviation of a determined by the modulation value determination unit phase comparison value of a phase reference value.
• the drop detection device has a reference value memory device, in which an amplitude reference value, which is formed from a plurality of amplitude comparison values of previously detected modulation signals, and / or a phase reference value, which consists of a plurality of phase comparison values of before recorded modulation signals is stored as variable reference values.
• the detection filter unit is configured to determine whether the determined relative deviation of the amplitude comparison value from the amplitude reference value and / or the determined relative deviation of the phase comparison value from the phase reference value does not exceed a relative lower and upper limit value
• the detection filter unit is preferably set up to determine whether the absolute amplitude reference value used for determining the deviation of the amplitude comparison value lies in a predetermined absolute amplitude reference value interval and / or whether it is used for determining the deviation of the phase comparison value absolute phase reference value is within a predetermined absolute phase reference value interval.
• the modulation unit comprises a light emission unit and a light sensor unit and / or a capacitive sensor unit.
• the signal transmission unit is preferably configured to generate a square wave signal as the carrier signal.
• the detection device for detecting drops emerging from a nozzle and moving along a trajectory comprises the following elements:
• an optical waveguide arrangement as signal conductor having a first optical waveguide and a second optical waveguide, which are arranged opposite each other at a gap through which the trajectory of the droplet passes, such that a light beam emitted by the first optical waveguide crosses the trajectory of the droplet and subsequently into the droplet second optical waveguide is coupled in,
• a light signal transmitting unit for coupling a light beam pulsed with a carrier frequency into the first optical waveguide
• a light evaluation device to evaluate the coupled into the second optical fiber light beam to determine whether a drop was discharged from the nozzle.
• the first optical waveguide preferably has a first and a second end, the first end of the first optical waveguide being coupled to a light emitting device of the light signal transmitting unit, and the second end of the first optical waveguide forming an emission window to the interspace to be monitored.
• the second optical waveguide has a first and a second end, and the first end of the second optical waveguide then forms a detection window to the interspace to be monitored, and the second end of the second optical waveguide is coupled to a sensor device of the light evaluation device.
• the optical waveguides are preferably arranged on the nozzle such that the pulsed light beam from the first optical waveguide directly strikes the droplet, is modulated by the droplets and is coupled directly into the second optical waveguide.
• the first optical waveguide and the second optical waveguide preferably comprise plastic fibers.
• the optical waveguides and thus the guide channels are preferably positioned relative to the nozzle (or the nozzle opening area) such that a defined effective cross-sectional area of the first and / or second optical waveguide is given as a function of the respective metering process, in particular as a function of an expected drop size ,
• the light evaluation device is configured to determine, taking into account a defined carrier frequency of the pulsed light beam, whether a drop has been emitted from the nozzle.
• the drop detection device preferably comprises a demodulation unit which is set up to carry out an amplitude demodulation or a quadrature demodulation of a modulated measurement signal detected on the basis of the pulsed light beam.
• the light evaluation device preferably comprises a modulation value determination unit which is set up, preferably based on an in-phase component and a quadrature component, to determine the magnitude of the amplitude and / or the phase of a modulation signal based on the modulated measurement signal.
• the light emitting device is arranged to convert a pulsed electrical signal into a light wave without changing the carrier frequency and phase of the pulsed signal to a relevant extent (see above).
• the light signal transmission unit is preferably designed such that the brightness of the pulsed light beam is set via the selection of a pulse width of light pulses of the pulsed light beam.
• the signals or signal conductors are guided through the guide channels of the guide system according to the invention to the nozzle opening.
• the guide channels are designed so that they can be incorporated as described above.
• FIG. 1 shows a schematic representation of a preferred guidance system in a preferred detection device
• FIG. 2 shows a preferred embodiment of a metering device with a preferred embodiment of a guide system
• FIG. 3 shows the guide system according to FIG. 2 in the form of an explosive drawing
• FIG. 4 shows details of the guide system according to FIGS. 2 and 3
• FIG. 5 shows further details of the guide system according to FIGS. 2 and 3 for explaining a quick-coupling device for attaching the guide system to a dosing device
• FIG. 6 shows further details of a clamping jaw of the quick-coupling device of the guide system according to FIG. 5,
• FIGS. 7 shows a schematic illustration of a preferred arrangement of curves in a guide channel of the guide system according to FIGS. 2 and 3,
• FIG. 8 shows a further preferred embodiment of a guide system on a metering device
• FIG. 9 is a schematic representation of another preferred arrangement of curves in guide channels of an embodiment of a guide system according to the invention.
• FIG. 1 shows a roughly schematic arrangement of a preferred exemplary embodiment of a guide system 1 in a preferred detection device 3.
• a nozzle 4, which is part of a metering device 2 is shown in plan view. This can be constructed, for example, as will be explained later with reference to FIGS. 2 and 8.
• drops of a dosing agent 23 see Figure 2 or medium, for.
• adhesive injected or metered.
• the nozzle 4 has a nozzle opening 5 from which the medium leaves the nozzle.
• the (only virtual) "nozzle opening area" 6 of the guide system 1 is arranged, which represents the reference area for the guide channels 7 in the absence of the nozzle 4, ie, for example, in a guide system 1 not attached to a metering device 2
• the guide channels 7, which can be present in particular in tubes or can be recesses in a block of material, as will be shown later, are arranged opposite each other on two sides, the central axis 9 of which is located centrally in each guide channel 7.
• FIG. 1 shows an arrangement in which the two guide channels 7 lie exactly diametrically opposite to the nozzle opening 5 or the nozzle opening area 6.
• the two central axes 9 run here between the ends of the guide channels 7 on a common straight line G and would meet the respective opposite guide channel 7 centrally.
• This straight line G runs vertically through the emission direction R.
• signal conductors 8 are introduced, which extend to the nozzle 4. You can at the nozzle 4 flush with the guide channels 7, but also - as shown here - survive something. Theoretically, they can also reach up to the nozzle opening 5.
• the signal conductors 8 together with the guide system 1 (or as part of the same), possibly with holding elements 10, with a signal transmitting unit 1 1, with a Signal receiving unit 12 and a signal evaluation unit 13 is a preferred detection device 3 (or a detection system 3). It should be noted that Figure 1, the detection device 3 outlined only very roughly. In practice, it would be of great advantage to arrange the electronic elements farther away from the nozzle opening 5 and to make the guide channels 7 and the signal conductors 8 longer.
• FIG. 2 shows a preferred metering device 2 with a nozzle 4, which has a nozzle opening 5.
• the nozzle 4 is located in a nozzle block 40 in which the actual nozzle mechanism is located to the nozzle 4 and the nozzle opening 5 z. B. in the desired manner to open and close or eject the dosing in the desired manner in the form of small drops.
• This nozzle block is flanged to a control block 41, in which the control mechanism for actuating the closing mechanism in the nozzle block 40 is arranged.
• the actuation of the control mechanism can be done for example hydraulically, pneumatically, by piezo elements or the like.
• Via a line 42 (not visible in FIG. 2, but see FIG. 8), the dosing material is supplied to the nozzle 4.
• Corresponding metering devices 2 with a nozzle 4 which can be used in the context of the invention, however, are known to the person skilled in the art and therefore need not be explained in detail here.
• a suitable metering device reference may be made to DE 10 201 1 108 799 A1.
• the invention is also useful on other metering devices.
• a guide system 1 is mounted, so that the nozzle opening portion 6 of the guide system 1 is located exactly at the position of the nozzle opening 5.
• the guide channels 7 are designed as cutouts or differently produced recesses in a material block 15 which - as will be shown later with reference to FIG. 3 - can be formed from two material block segments 15u, 15o or material block parts.
• the guide channels 7 extend here in a curved line upwards, in the direction of the Z coordinate, or counter to the emission direction R, up to a coupling point 24. From this coupling point 24, the light guides 8, after having previously been at their lower end portions, which are in the guide channels, stripped from the usual jacket M or were stripped, are introduced. The stripping takes place so far that in a direction away from the nozzle opening portion 6 portion of the guide channels 7, in which the diameter is slightly larger than in the remaining portion of the guide channels 7, just a portion of the fiber-optic shell M can be pushed. By means of terminals 17K, the light guides 8 can then be fixed there with their fiber-optic jacket M to form a strain relief 17.
• the light guide sheaths M in the illustrated embodiment can also easily separate again from the material block 15 and pull out together with the light guides 8 from the guide system, z. B. to replace the light guide 8 or for cleaning.
• These terminals 17K which are designed here as spring-loaded push buttons 17K, can be easily solved by a pressure on them.
• a lock 18 This lock consists in each case of a pin 18 which is inserted into a running in the region of the terminals 17K parallel to the guide channel 7 hole.
• the guide system 1 is characterized by a quick coupling device 28 explained in more detail later with reference to FIGS. 5 and 6 in the form of a clamping with a component
• the quick coupling device 28 can be operated without tools by means of a knurled screw 19.
• FIG. 3 shows, as mentioned above, the guide system 1 according to FIG. 2 with a segmented material block 15.
• the guide channels 7 can be seen, which in this two-part form of the material blocks 15 can easily be seen Cutouts can be made.
• Both the lower material block segment 15 u and the upper material block segment 15 o are substantially L-shaped, with a lower L-leg 15 L, which in each case mounted in a dosing device 2 on a lower side of the dosing device 2, at which the Nozzle opening 5 is located, and an upper leg of L, which runs parallel to a front side of the metering device 2, at which the Guide system 1 is mounted.
• the upper material block segment 15o is shaped so that the outer contour of the "L” is matched to the inner contour of the "L" of the lower material block segment 15u, so that the upper material block segment 15o can be fitted into the lower material block segment 15u.
• the nozzle opening region 6 located in a recess in the lower L-limb 15L and the milled-in guide channels 7 can be seen, in which the light guides 8 extend.
• These optical fibers 8 need not necessarily, but may well be part of the guide system 1.
• holes for the terminals 17K are also visible here, at each of which the jacket M of an inserted light guide 8 ends.
• FIG. 4 shows further individual details of this guide system 1 shown in FIGS. 2 and 3, namely the two light guides 8 arranged in the guide channels 7 in the material block 15, various individual elements 17K, 17F, 18 of the strain relief 17 and a movable jaw 29 of the already mentioned Quick coupling device 28 with the knurled screw 19.
• the light guides 8 are, as can be seen here, still provided in the upper region with its jacket M and in the lower region, with which the light guide 8 through the guide channels. 7 to be pushed, already stripped.
• the end portions 14 of the signal conductors 8, when inserted into the material block of FIG. 3, should correspond to the end portions of the guide channels 7 in the material block 15.
• the clamps 17K essentially consist in each case of a push button 17K in the form of a pin, which has two circumferential grooves 17S, 17L below a pressure surface on which an operator can press to release the clamp.
• the push buttons 17K are each inserted in a corresponding recess in the material block 15 biased against a spring 17F. By means of this spring 17F, the push buttons 17K would be pushed out of the recess in the material block 15 again.
• a in the upper locking groove 17 S directly below the pressure surface engaging, serving as a lock pin 18 which is inserted into a corresponding bore parallel to the guide channel 7, but they are secured within the recess in the material block 15.
• the second signal conductor groove 17L extending to this upper securing groove 17S is arranged in the region of the guide channel 7 in such a way that a light conductor 8 inserted into the guide channel 7 is clamped with its jacket M in the signal conductor groove 17N when the pushbutton 17K is pressed by the spring 17F against the light guide 17F the upper securing groove 17S arranged pin 18 is pressed.
• the push button 17K To release the light guide 8, the push button 17K must be pressed down a little against the spring force only by the operator. This mechanism is particularly convenient to achieve a sufficient strain relief of the light guide 8 in the material block 15.
• the guide system 1 is advantageously equipped with a quick-coupling device 28 in order to couple it without tools to the metering device 2, in this case to clamp it specifically to the nozzle block 40.
• This quick-coupling device 28 can best be explained with reference to FIGS. 5 and 6.
• Figure 5 shows this the material block 15 with the guide channels 7 from a similar perspective as Figure 3, namely seen from the (not shown here) metering device 1, but in the assembled state of the two material block segments 15u, 15o and with a movable, in a clamping direction K slidably disposed in a guide channel 31 in the material block 15 jaw 29.
• This guide channel 31 is formed by a cavity adapted to a cross-section of the clamping jaw 29 perpendicular to the clamping direction K, which is located in the upper side of the material block 15 facing the incoming signal conductors 8 (the upper side in FIGS. 3 and 5).
• This cavity is delimited on the side facing the metering device 2 by a front wall 32 arranged at the end of the upper L-leg of the upper material block segment 15o and by the side facing away from the metering device 2 by a rear wall 33 which extends through an incoming signal conductor 8 facing upper L-leg of the lower material block segment 15u is formed (see also Figure 3).
• Between the front wall 32 and the two lateral sections for feeding the light guides 8 in the upper L-leg of the upper material block segment 15o are two guide slots 34 for two retaining fingers 29a, 29b or retaining jaws of the jaw 29, which will be explained below.
• Figure 6 shows once again the exempted jaw 29 with the thumbscrew 19, the (here parallel to the upper portion of the light guide 8) from top to bottom through the jaw 29, freely rotatable therethrough passes, so that a threaded portion of the thumb screw 19 down protrudes from the jaw 29 and the top (at the top) a thumbwheel for operating the thumbscrew 19 is located.
• Parallel to the threaded portion of the thumbscrew 19, here, two guide pins 20a extend from the underside of the clamping jaw 29.
• a threaded hole 20G (or threaded hole) for the thread of the thumbscrew 19 and fitting thereto two guide holes 20F (or guide holes) for the guide pin 20F introduced.
• Both the threaded hole 20G and the guide holes 20F pass through the upper material block segment 15o and extend into, preferably even through, the lower material block segment 15u.
• the thread of the threaded hole 20G is preferably located only in the lower material block segment 15u, so that the threaded portion of the thumb screw 19 can freely pass through the upper part of the threaded hole 20G in the upper material block segment 15o.
• the movable clamping jaw 29 has retaining fingers 29a, 29b which protrude through guide slots 34 in the lower material block 15 out of the guide channel 31 of the material block 15 substantially parallel to the end profile of the lower L-leg 15L of the material block 15.
• a clamping mechanism is formed in the manner of a vise, so that Tightening the thumbscrew 19 is a part of the metering device 2, here the nozzle block 40 of the metering device 2, clamped therebetween and thus the entire guide system 1 can be fixed to the metering device 2.
• the two retaining fingers 29b engage from above on the nozzle block 40, wherein one of the retaining fingers 29a in a slot 43 (which can be seen in Figures 2 or 8) between the nozzle block 40 and the control block 41 is pushed.
• the lower L-leg 15 L presses as a counter jaw from below against the nozzle block 40, wherein automatically the nozzle opening portion 6 fits the nozzle opening 5.
• One holding finger 29a is made relatively thin so as to fit into the above-mentioned slot 43 between the nozzle block 40 and the control block 41, and the other holding finger 29b is formed to fit in a positive fit on another position of the nozzle block 40.
• the material of the movable jaw 29 is chamfered.
• the slope 30 takes into account the given shape of the control block.
• Figure 7 shows schematically a preferred arrangement of curves 21, 21 a in a guide channel 7.
• This curve guide corresponds to the curve guide in the preferred embodiment shown with reference to Figures 2 to 4.
• the guide channel 7 extends after the end region 14 initially in a curve 21 in a first spatial plane 25, which would be orthogonal to the emission direction of droplets in an arrangement of the guide channel in a metering device.
• the course of the guide channel 7 and thus the course of the central axis 9 changes with this curve by the angle a, which corresponds to 90 ° here.
• FIG. 8 shows a perspective view of a further preferred embodiment of a guide system 1 on a metering device 2, which may be the same metering device 2 as in the exemplary embodiment according to FIGS. 2 to 4.
• the guide channels of tubes 16 are formed here without the use of a block of material.
• These tubes 16 can be additionally stabilized by means of stabilizing elements 22 and a stabilizing plate 27.
• the resulting injection direction R is shown opposite to the Z-axis, on which dripped drops 23 would move.
• the stabilizing elements 22 may be formed simultaneously as a kind of strain relief.
• the jacket M of the light guide could be jammed.
• the tubes 16 terminate here directly at the nozzle 4 again so that the end regions 14 of these guide channels are opposite to the nozzle opening 5 of the nozzle 4 of the metering device 2.
• At the upper part of the tubes holding elements 10 are shown, by means of which measuring units of a detection device can be connected to the structure.
• the tubes could also be at least partially designed as a Bowden cable and thus be flexibly laid, wherein preferably the beginning and the end would be fixed.
• FIG. 9 shows another preferred arrangement of curves 36, 36a in guide channels 7.
• This curve guide serves in particular for feeding particularly fine glass fiber cables, which preferably have only a core diameter of at most approximately 0.5 mm, particularly preferably approximately 0.3 mm and have an outer diameter of about 0.7 mm. Accordingly, the guide channels have an inner diameter of also about 0.7 mm.
• the glass fibers are each supplied from one side to the nozzle opening area 6 here.
• the guide channels 7 are each in a block of material (not shown), however, is relatively flat and on both sides next to the nozzle opening portion 6 away below the nozzle block (not shown in Figure 9 but in Figure 8 in the bottom view with a another guide system shown) extends.
• the guide channels 7 each have a slight or flat S-curve-like curve, each with two adjacent, adjoining curves 36, 36 a, which in a common spatial plane 35 extend.
• the angle ⁇ of these curves 36, 36a is in each case approximately 16.5 °, the curves 36, 36a having the same direction, so that the center axis 9 of the guide channel 7 is slightly offset in front of and behind the curve only within the spatial plane 35.
• the guide channels 7 extend laterally close to the nozzle opening portion 6, below the nozzle block, and pass through the curve formation just before the nozzle opening portion 6 so as to continue toward the nozzle opening portion 6 parallel to the bottom of the nozzle block, but at a somewhat greater distance from the nozzle block ,
• the length of the guide channels here is about 1 cm.
• the optical fiber can be preferably clamped in the guide as described above.
• a quick coupling device could also be realized without clamping, with z.
• a thumbscrew or the like which is used directly for screwing the guide system with the metering device, or a clamping can be done with another mechanism.
• the use of the indefinite article “on” or “one” does not exclude that the characteristics in question may also be present multiple times.
• the term “unit” does not exclude that it also consists of several, possibly also spatially separated, subunits.

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• 2017
  • 2017-02-24 DE DE102017103876.0A patent/DE102017103876A1/de not_active Withdrawn
• 2018
  • 2018-02-22 CN CN201880013853.5A patent/CN110366452A/zh active Pending
  • 2018-02-22 JP JP2019546012A patent/JP2020508211A/ja not_active Withdrawn
  • 2018-02-22 US US16/486,451 patent/US20190358665A1/en not_active Abandoned
  • 2018-02-22 EP EP18707679.9A patent/EP3585524A1/de not_active Withdrawn
  • 2018-02-22 WO PCT/EP2018/054406 patent/WO2018153997A1/de unknown
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