EP3904679B1 - Procédé de fonctionnement d'une pompe à piston à double action, pompe à piston à double action ainsi que système d'application permettant d'appliquer un milieu fluide à un substrat - Google Patents

Procédé de fonctionnement d'une pompe à piston à double action, pompe à piston à double action ainsi que système d'application permettant d'appliquer un milieu fluide à un substrat Download PDF

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Publication number
EP3904679B1
EP3904679B1 EP20172294.9A EP20172294A EP3904679B1 EP 3904679 B1 EP3904679 B1 EP 3904679B1 EP 20172294 A EP20172294 A EP 20172294A EP 3904679 B1 EP3904679 B1 EP 3904679B1
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EP
European Patent Office
Prior art keywords
piston
reversal point
reversal
movement direction
during
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.)
Active
Application number
EP20172294.9A
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German (de)
English (en)
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EP3904679A1 (fr
Inventor
Andreas Hofer
Hanspeter Felix
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Robatech AG
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Robatech AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robatech AG filed Critical Robatech AG
Priority to EP20172294.9A priority Critical patent/EP3904679B1/fr
Priority to EP23168193.3A priority patent/EP4219942A1/fr
Priority to US17/244,879 priority patent/US11766693B2/en
Priority to CN202110483238.4A priority patent/CN113578688A/zh
Publication of EP3904679A1 publication Critical patent/EP3904679A1/fr
Priority to US18/231,123 priority patent/US20230372963A1/en
Application granted granted Critical
Publication of EP3904679B1 publication Critical patent/EP3904679B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/06—Control using electricity
    • F04B49/065—Control using electricity and making use of computers
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B11/00—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation
    • F04B11/0041—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation by piston speed control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B15/00—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts
    • F04B15/02—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts the fluids being viscous or non-homogeneous
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B5/00—Machines or pumps with differential-surface pistons
    • F04B5/02—Machines or pumps with differential-surface pistons with double-acting pistons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
    • F04B9/08—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid
    • F04B9/12—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being elastic, e.g. steam or air
    • F04B9/129—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being elastic, e.g. steam or air having plural pumping chambers
    • F04B9/131—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being elastic, e.g. steam or air having plural pumping chambers with two mechanically connected pumping members
    • F04B9/133—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being elastic, e.g. steam or air having plural pumping chambers with two mechanically connected pumping members reciprocating movement of the pumping members being obtained by a double-acting elastic-fluid motor
    • 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
    • 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
    • B05C11/1042—Storage, supply or control of liquid or other fluent material; Recovery of excess liquid or other fluent material provided with means for heating or cooling the liquid or other fluent material in the supplying means upstream of the applying apparatus
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B2201/00—Pump parameters
    • F04B2201/02—Piston parameters
    • F04B2201/0201—Position of the piston
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B2201/00—Pump parameters
    • F04B2201/02—Piston parameters
    • F04B2201/0202—Linear speed of the piston

Definitions

  • the invention relates to a method for operating a double-acting, preferably pneumatically driven or drivable piston pump of an application system for applying a flowable medium, in particular a heated adhesive, to a substrate, wherein the piston pump has a piston that can be moved between a first reversal point and a second reversal point for conveying the flowable medium. When the respective reversal point is reached, the direction of movement of the piston is reversed.
  • the application system has a dispensing device for intermittently dispensing the flowable medium conveyed to the dispensing device by means of the piston pump.
  • a piston pump for pumping a flowable medium is known, for example, from the EP 2 732 884 A2 known.
  • the pressure drop and its temporal progression are strongly dependent on the design and the execution of some components of the piston pump.
  • the reversal of the stroke direction of a pneumatically driven piston pump with a pneumatic piston takes place via an electrically operated pneumatic changeover valve.
  • the changeover process of this valve takes a certain amount of time.
  • the reduction of air pressure on one side of the pneumatic piston and the build-up of air pressure on the other side of the pneumatic piston require a certain amount of time.
  • Double-acting piston pumps often have two check valves, which usually do not have identical designs.
  • the two check valves are usually designed in the form of movable balls which, when the piston is operating vertically, alternately seal against the flow of the fluid medium to be pumped at the top and bottom.
  • the ball of one check valve moves from a sealing position to a passage position and the ball of the other check valve moves from a passage position to a sealing position and vice versa. This movement of the balls also takes some time.
  • a slight loss of volume flow of the fluid medium occurs. This loss or pressure drop is typically different at the two reversal points.
  • the output of fluid medium is reduced at the reversal points of the piston pump, which has a negative effect on the application pattern.
  • the flowable medium is continuously dispensed in the form of a strip, also known as an application bead or bead
  • there will be clear constrictions in the cross-section of the bead in the applied bead which correlate in time with the reversal points of the direction of movement of the piston of the adhesive pump.
  • the so-called application pattern then shows clear, regular constrictions.
  • a piston pump is provided, wherein the piston pump has at least two piston-cylinder units for conveying the flowable medium.
  • the two pumps are operated in such a way that a pressure drop when conveying the fluid from one pump is compensated by the other pump.
  • the prior art ES 2 064 183 A2 the use of a pressure accumulator is known, whereby when the direction of movement of the piston of the piston pump is reversed, the pressure accumulator largely compensates for the falling pressure.
  • the disadvantage of this solution is that a pressure accumulator can only be optimally designed for one operating state The compensation of the falling pressure is only satisfactory for a certain pressure setting and only for a certain viscosity of the flowable medium. The greater the deviation from the optimal operating point, the worse the compensation of the pressure drop by the pressure accumulator is.
  • the object of the present invention is to provide a method for operating a double-acting piston pump of an application system for applying a flowable medium, in particular a heated adhesive, to a substrate, so that effects of the pressure drop when reversing the direction of movement on the application pattern are avoided or at least reduced, in particular constrictions of an application bead are avoided or at least reduced.
  • the method according to the invention is a method for operating a double-acting piston pump of an application system for applying a flowable medium.
  • the flowable medium is in particular a heated adhesive and/or a viscous hot melt adhesive.
  • the piston pump is a double-acting piston pump, thus a piston pump that conveys the flowable medium in both stroke directions of the piston.
  • the application system is used to apply the flowable medium to a substrate, whereby the substrate can be, for example, a sheet of paper, a cardboard box or a film.
  • a substrate can certainly consist of a large number of separate structures,
  • the substrate may be a plurality of strip-like elements, e.g. paper strips, cardboard strips or film strips, which are arranged at a distance from one another and are guided one after the other past an application head which serves to dispense the medium.
  • the piston pump has a piston that can be moved between a first reversal point and a second reversal point for conveying the flowable medium, wherein the direction of movement of the piston is reversed when the respective reversal point is reached.
  • the application system also has a dispensing device, for example one or more spray heads, for intermittently dispensing the flowable medium conveyed to the dispensing device by means of the piston pump.
  • the method according to the invention provides that the flowable medium is dispensed by means of the dispensing device during dispensing periods and that the flowable medium is interrupted by means of the dispensing device during interruption periods.
  • the method according to the invention provides that the direction of movement of the piston is reversed during at least one interruption period of the interruption periods, wherein the piston is in an intermediate position between the first reversal point and the second reversal point when the direction of movement is reversed during the at least one interruption period.
  • the reversal of the direction of movement of the piston takes place during the at least one interruption period of the interruption periods in such a way that the time until the dispensing period following the at least one interruption period is sufficient to rebuild a target value of the pressure until the beginning of the subsequent dispensing period, insofar as by the beginning of the subsequent issue period, the reversal-related, time-limited pressure drop has passed.
  • the direction of movement of the piston is only reversed when the respective reversal point is reached.
  • the direction of movement of the piston of the piston pump changes during at least one of the interruption periods in an intermediate position, thus before the reversal point in the direction of movement is reached.
  • the intermittent dispensing of the flowable medium is carried out in such a way that the intermittent dispensing results in a temporally recurring pattern of dispensed flowable medium, in particular when a large number of similar substrates are provided with the flowable medium.
  • the piston pump preferably has a delivery area and a drive area.
  • the piston is arranged in the delivery area and serves to convey the flowable medium.
  • the components that drive the movement of the piston are arranged at least partially, preferably completely, in the drive area.
  • the piston pump is preferably a pneumatically driven piston pump.
  • the piston pump preferably has a pneumatic piston that is operatively connected to the piston that is used to convey the flowable medium and that serves to drive the movement of the piston.
  • a corresponding side of the pneumatic piston is pressurized with compressed air and the other side is vented.
  • the reversal of the direction of movement of the piston preferably takes place via an electrically or magnetically actuated pneumatic changeover valve.
  • the piston pump has a pneumatic part, also referred to as pneumatic area, and a conveying area, wherein the pneumatic piston is arranged in the pneumatic part and the piston which serves to convey the flowable medium is arranged in the conveying area.
  • a hydraulic drive in particular with a hydraulic piston
  • an electric drive in particular in the form of a linear motor.
  • the first reversal point and the second reversal point are not variable, so that the first reversal point and the second reversal point are fixed when the double-acting piston pump is operated.
  • the two reversal points are unchangeable, in particular due to the design.
  • the first reversal point and the second reversal point are respectively a bottom and top dead center of the piston.
  • the direction of movement of the piston is reversed exclusively or at least mostly during the interruption periods. This means that the negative influences of the respective reversal of the direction of movement on the application pattern are particularly low. However, the direction of movement of the piston does not necessarily have to be reversed during every interruption period.
  • an output quantity of the flowable medium output by means of the output device during the respective output period is smaller than a delivery quantity of the medium delivered by means of the piston pump during a piston stroke of the piston pump from the first reversal point to the second reversal point and/or vice versa to the output device.
  • the flowable medium can be output during the output periods without reversing the direction of movement of the piston. This has a particularly advantageous effect on the quality of the application of the flowable medium to the substrate.
  • the output quantity of the flowable medium output by the output device during one of the output periods is greater than the medium delivered to the output device during a complete stroke length of the piston pump or when one of the reversal points is reached during one of the output periods
  • a spring accumulator or a pressure accumulator based on the principle of a single-acting pneumatically operated piston pump can be used as the pressure accumulator.
  • a number of reversals of the direction of movement that occur in intermediate positions of the piston between the first reversal point and the second reversal point is preferably greater than a number of reversals of the direction of movement that occur in the reversal points.
  • the reversal of the direction of movement occurs predominantly in intermediate positions of the piston between the first reversal point and the second reversal point.
  • piston speed is understood to be the amount of the piston speed, of the piston is reduced compared to a piston speed during the dispensing periods, in particular the piston speed during the interruption periods is zero. Accordingly, the temporal development of the piston speed is correlated with the dispensing periods and the interruption periods. Accordingly, by recording the piston speed, it can be determined whether an dispensing period or an interruption period is present.
  • the reversal of the direction of movement can take place independently of the higher-level control or knowledge of the operating state of the dispensing device (dispensing or interruption of dispensing) based solely on the measured piston speed, so that the piston pump can be operated almost autonomously, thus eliminating the need for a higher-level control. Since the piston speed is correlated with the dispensing periods and interruption periods, the direction of movement of the piston can be reversed depending on the piston speed and knowledge of the piston speed can be used to reverse the direction of movement. Direction of movement during at least one interruption period.
  • the recurring application pattern can be recognized by measuring the piston speed. This makes it possible to determine the expected stroke of the piston at the beginning of an interruption period until the beginning of the next interruption period.
  • the programmed or specified application pattern of a higher-level application control is used to determine the temporal progression of the interruption periods in order to determine the expected piston positions with respect to the interruption periods. This can improve operational reliability, as unexpected changes in the application pattern can be taken into account.
  • the piston pump is subject to leakage with regard to the flowable medium to be pumped, so that during the interruption periods the piston speed of the piston is reduced compared to the piston speed during the dispensing periods.
  • a leaky piston pump is also considered advantageous in terms of minimizing wear, avoiding maintenance work and ensuring the piston pump has the longest possible service life. It is considered particularly advantageous if the leakage occurs between the piston and the cylinder. This leakage depends primarily on the viscosity and flow behavior of the flowable medium, the size of a gap around the piston and the pressure that the piston pump builds up.
  • the piston speed of the piston is reduced during the interruption periods compared to the piston speed during the dispensing periods, because during the interruption periods the resistance of the piston movement is increased compared to the resistance of the piston movement when the flowable medium is dispensed.
  • the piston of the piston pump is not designed to be sealed with respect to a cylinder and/or the piston pump has a piston rod that is not designed to be sealed with respect to a guide.
  • the piston pump preferably has two check valves, whereby one check valve is open and the other check valve is closed depending on the direction of movement of the piston.
  • the two check valves are usually designed in the form of movable balls which, when the piston is in the vertical operating direction, alternately seal the top and bottom against the flow of the fluid medium to be pumped.
  • the ball of one check valve moves from a sealing position to a passage position and the ball of the other check valve moves from a passage position to a sealing position and vice versa during a subsequent switching process.
  • the piston speed is measured and a reversal of the direction of movement of the piston outside the reversal points occurs when the piston speed is equal to a certain value, in particular the certain value corresponds to the piston speed of the piston during the interruption periods.
  • the aforementioned condition namely that the piston speed is less than or equal to a certain value, is to be understood as a necessary condition but not necessarily a sufficient condition for the reversal of the direction of movement of the piston. However, it is certainly conceivable that it is a sufficient condition for the reversal of the direction of movement of the piston.
  • a distance of the piston from the reversal point in the direction of movement of the piston is determined, wherein a reversal of the direction of movement of the piston takes place during the respective interruption period before reaching the reversal point in the direction of movement of the piston if the distance of the piston from the reversal point in the direction of movement of the piston falls below a certain value, and/or wherein a distance of the piston from the reversal point opposite to the direction of movement of the piston is determined, wherein a reversal of the direction of movement of the piston takes place during the respective interruption period before reaching the reversal point in the direction of movement of the piston
  • the reversal point occurs when the distance of the piston from the reversal point opposite to the direction of movement of the piston exceeds a certain value.
  • the distance of the piston from the respective reversal point used for comparison with the determined value is preferably determined at the beginning of the respective interruption period.
  • the determined value with respect to the reversal point in the direction of movement of the piston preferably corresponds to an expected stroke of the piston in the direction of movement of the piston until the beginning of the next interruption period.
  • the determined value with respect to the reversal point opposite to the direction of movement of the piston preferably corresponds to an expected stroke of the piston opposite to the direction of movement of the piston until the beginning of the next interruption period.
  • the piston speed is measured and a distance of the piston from the reversal point in the direction of movement of the piston is determined, wherein a reversal of the direction of movement of the piston occurs when the piston speed falls below a certain value and the distance of the piston from the reversal point in the direction of movement of the piston falls below a certain value, and/or if the piston speed is measured and a distance of the piston from the reversal point opposite to the direction of movement of the piston is determined, wherein a reversal of the direction of movement of the movable piston occurs when the piston speed falls below a certain value and the distance of the piston from the reversal point opposite to the direction of movement of the piston exceeds a certain value.
  • the piston speed is a criterion for whether an interruption period is present. Since a reversal of the direction of movement of the piston should occur during an interruption period, a reversal of the direction of movement of the piston should only occur during a period with reduced piston speed. Therefore, the reduced piston speed is a first criterion for switching. The distance of the piston from the respective reversal point is used as a further criterion to decide whether a reversal of the direction of movement should occur.
  • the piston position is used to determine the distance value of the piston from the respective reversal point or that the distance value of the piston from the respective reversal point is determined when the piston speed falls below a certain value.
  • it is first checked whether the first criterion, namely the falling below a certain speed value of the piston speed, is present. Only when the first criterion is present is the second criterion, namely the distance, checked. This reduces the measurement and evaluation effort.
  • the piston pump has sensors for measuring a piston position and/or a distance of the piston from the first reversal point or the second reversal point and/or for measuring the direction of movement of the piston and/or for measuring the speed of the piston. It is considered particularly advantageous if the sensor is designed as a Hall sensor. In connection with a Hall sensor, it is considered particularly advantageous if the piston pump has a magnet, preferably a ring magnet, wherein the magnet together with the Piston is movable. It is quite conceivable that the piston pump has several Hall sensors, preferably at least four Hall sensors, in particular exactly four Hall sensors.
  • distance is to be understood broadly in the above contexts.
  • distance then being understood to mean the section in which the piston is located.
  • the distance can be divided into a first section and a second section, with the first section containing the first reversal point and the second section containing the second reversal point.
  • the section in which the piston is currently located can then be used as a distance criterion or distance.
  • the distance of the piston from the first reversal point is smaller when the piston is in the first section than when the piston is in the second section. Knowing which section the piston is in can therefore be used as a criterion for falling below or exceeding a distance value.
  • the double-acting piston pump described below is suitable for carrying out preferred embodiments of the method according to the invention.
  • the double-acting piston pump serves to convey a flowable medium to a dispensing device.
  • the double-acting piston pump serves to convey a heated adhesive, in particular a viscous hot melt adhesive, to a dispensing device.
  • the dispensing device can in particular be a spray head.
  • the piston pump has a reversal point between a first and a second
  • the piston pump also has a piston that can be moved to a reversal point and that serves to convey the flowable medium.
  • the piston pump also has a control device for controlling the direction of movement of the piston, the control device being set up to reverse the direction of movement of the piston when the respective reversal point is reached.
  • the piston pump also has a measuring device for measuring a piston speed, the control device being set up to reverse the direction of movement of the piston when the measured piston speed falls below a certain speed value.
  • the piston speed is a measure of whether flowable medium is being dispensed by the dispensing device or whether the dispensing of flowable medium by means of the dispensing device is interrupted.
  • the double-acting piston pump is thus suitable for carrying out the method according to the invention with the corresponding advantages.
  • the piston pump is subject to leakage with respect to the flowable medium to be pumped.
  • the piston is not designed to seal with respect to a cylinder and/or the piston pump has a piston rod that is not designed to seal in a guide.
  • a piston pump subject to leakage has the advantage that wear on the piston pump is reduced and, in terms of the process, the advantage that the speed of the piston during the interruption periods is reduced compared to the speed of the piston during the dispensing periods.
  • the piston pump preferably has two check valves, whereby depending on the direction of movement of the piston, one check valve is open and the other check valve is closed, in particular the check valves are designed differently.
  • the two check valves are assigned to the part of the piston pump in which the flowable medium is conveyed, thus the conveying area.
  • the double-acting piston pump is preferably designed as a pneumatically driven piston pump.
  • the piston pump has a pneumatic part, also referred to as the pneumatic area, and a delivery area, wherein the pneumatic piston is arranged in the pneumatic part and the piston which serves to convey the flowable medium is arranged in the delivery area.
  • the piston pump has a measuring device for measuring a distance of the piston position of the piston from the reversal point lying in the direction of movement of the piston, wherein the control device is set up to reverse the direction of movement of the piston when a certain speed value of the measured piston speed is undershot and a certain distance value of the measured distance is undershot, or the piston pump has a measuring device for measuring a distance of the piston position of the piston from the reversal point lying opposite to the direction of movement of the piston, wherein the control device is set up to reverse the direction of movement of the piston when a certain speed value of the measured piston speed is undershot and a certain distance value of the measured distance is overshot.
  • the piston pump preferably has one or more magnets, preferably one or more ring magnets, the magnet being movable together with the piston or the magnets being movable together with the piston, the measuring device for measuring the piston speed having at least one Hall sensor and/or the measuring device for measuring the distance having at least one Hall sensor.
  • the piston pump preferably has at least three Hall sensors, in particular at least four Hall sensors. If there are several Hall sensors, the piston pump preferably also has several magnets. In particular, a magnet is assigned to each Hall sensor.
  • the control device preferably has an evaluation device for evaluating the magnetic flux density measured by means of the one or more Hall sensors, the evaluation device being designed in particular to determine the first and second derivatives of the measured magnetic flux density. From the measured magnetic flux density, the first derivative of the flux density and the second derivative of the flux density, conclusions can be drawn about the piston position, the piston speed and the piston acceleration.
  • the piston pump preferably has at least two Hall sensors, wherein a path of the piston from one reversal point to the other reversal point with regard to the measurement of the piston speed and/or a measurement of the piston position is divided into at least two sections, wherein one of the at least two sensors can be assigned to the respective section.
  • the division of the path and the assignment of the Hall sensors is such that for the Hall sensor assignable to the respective section, there is an almost linear relationship between the magnetic flux density detected by this Hall sensor and the piston position of the piston when the piston is in the section assigned to this Hall sensor.
  • the adjustment process also makes it possible to determine the polarity of the magnet during the adjustment process.
  • the reference values can be adjusted automatically, in particular digital electronics for evaluating the Hall sensors can be programmed according to the installation position of the magnet. This means that it is not necessary to maintain a specific orientation of the magnet during installation. Disassembly to correct an incorrect installation position of the magnet is therefore not necessary.
  • the piston pump is designed as a pneumatically driven piston pump with a pneumatic piston that is operatively connected to the piston, wherein the control device has an actuatable valve or an actuatable valve arrangement, wherein when the valve or the valve arrangement is actuated, a direction of pressure application to the pneumatic piston changes.
  • the valve or the valve arrangement By actuating the valve or the valve arrangement, the direction of movement of the piston can thus be reversed in a simple manner.
  • An advantageous application system for applying a flowable medium, in particular a heated adhesive, to a substrate has the double-acting piston pump described above and a dispensing device for intermittently dispensing the flowable medium conveyed to the dispensing device by means of the double-acting piston pump.
  • the Fig.1 shows an application system 2 for applying a flowable medium, in this case a heated adhesive, to a substrate 3.
  • the substrate 3 can be, for example, sheets of paper or cardboard.
  • the application system 2 has a double-acting piston pump 1. Since it is a double-acting piston pump 1, the piston pump 1 is effective in both stroke directions of the piston 4.
  • the flowable medium is conveyed from a storage container (not shown) that can be connected to the piston pump 1 to a dispensing device 5.
  • the dispensing device 5 is fluidly connected to the piston pump 1, namely a cylinder bore 12 of the piston pump, by means of a heating hose 11.
  • the adhesive passes from the storage container into a suction chamber 13 for adhesive. From there, the adhesive is sucked into the cylinder bore 12 and conveyed under pressure to the dispensing device 5 via a pressure connection 14 to which the heating hose 11 is connected.
  • the dispensing device 5 is in this case suitable for intermittently dispensing the adhesive conveyed to the dispensing device 5, so that During dispensing periods, the adhesive is dispensed by means of the dispensing device 5 and during interruption periods, the adhesive is dispensed by means of the dispensing device 5.
  • This is advantageous, for example, when, as in the Fig.1 schematically shown, the adhesive is to be applied to substrates 3 which are arranged at a distance from one another on a conveyor belt 15 and are moved past the dispensing device 5, in particular continuously, in the direction of the arrow 16 by means of this conveyor belt 15, wherein the dispensing device 5 applies a bead of adhesive 17 to the respective substrate 3.
  • the piston 4 of the piston pump 1 can be moved between a first reversal point 24 and a second reversal point 25.
  • the direction of movement of the piston 4 is reversed.
  • the pressure of the adhesive being delivered drops for a limited period of time. If adhesive is dispensed by means of the dispensing device 5 during this limited period of time, this pressure drop has a negative effect on the amount of adhesive dispensed and thus on the so-called application pattern.
  • a significantly smaller amount of adhesive is applied than during a continuous movement of the piston 4 of the piston pump 1.
  • a clear constriction 18 is then visible in the applied adhesive bead 17.
  • the effects of the switching processes of the piston pump 4 on the amount of adhesive dispensed per unit of time 23 and the adhesive pattern or the adhesive beads 17 can be seen from the Fig.5 visible.
  • the switching process thus reversing the direction of movement of the piston 4, is usually carried out purely mechanically or by operating an electrical or electronic switch. There is no temporal coordination between the switching process of the direction of movement of the piston 4 of the piston pump 1 and the dispensing periods and interruption periods of the adhesive application.
  • an output quantity of the adhesive dispensed by means of the dispensing device 5 during the respective dispensing period is smaller than a delivery quantity of the medium conveyed by means of the piston pump 1 during one piston stroke of the piston 4 from the one reversal point 24, 25 to the other reversal point 24, 25 to the dispensing device 5.
  • the piston pump 1 shown is a piston pump 1 which is subject to leakage with respect to the adhesive to be pumped, so that during the interruption periods a piston speed of the piston 4 is reduced compared to a piston speed during the output periods. This is also evident from the temporal development of the piston position 26 of the piston 4, as shown in the Fig. 5 and 6
  • the leakage is realized in that the piston 4 is not designed to be sealing with respect to a cylinder bore 12, wherein the cylinder bore 12 is introduced into a housing 19 of the piston pump 1.
  • the piston pump 1 has an upper pneumatic part with a pneumatic piston 20 for the drive.
  • the pneumatic piston 20 is firmly connected to a piston rod 6, which in turn is connected to the piston 4, which serves to convey the adhesive.
  • a ring magnet 9 is also connected to the pneumatic piston 20 and thus to the piston rod 6.
  • An electronic print 21 is also formed adjacent to the pneumatic piston 20 or the ring magnet 9, with three Hall sensors 10 connected to the electronic print 21.
  • the Hall sensors 10 are designed in such a way that they measure the magnetic flux density in the horizontal direction.
  • the ring magnet 9 moves in accordance with the movement of the piston rod 6, so that the magnetic flux density detected by the respective Hall sensor 10 changes due to the change in the position of the ring magnet 9.
  • the piston position 26 and the piston speed can then be determined using the output signals of the Hall sensors 10. Furthermore, the direction of movement of the piston 4 or the pneumatic piston 20 can also be determined.
  • both the piston position 26, the piston speed and the direction of movement of the piston 4 can be determined by means of a single Hall sensor 10.
  • a single Hall sensor 10 Preferably, however, at least three Hall sensors 10 are used, since this increases the accuracy on the one hand and the redundancy on the other hand, thereby increasing the failure, functional and operational reliability of the piston pump 1.
  • the piston 4 is provided with an axial passage in the area of which a check valve 7 with associated valve seat is arranged.
  • the piston 4 is guided in a non-sealing manner in the cylinder bore 12 formed in the housing 19.
  • a second check valve 8 is formed in the cylinder bore 12.
  • the check valve 8 is assigned to the suction chamber 13 so that adhesive can enter the adhesive feed chamber of the piston pump 1 from the suction chamber 13 when the check valve 8 is in a defined position. If the check valve 7 is in a defined position, adhesive can reach the pressure connection 14 and from there via the heating hose 11 to the dispensing device 5.
  • a dynamic seal 22 without differential pressure is provided between the pneumatic part and the adhesive-feeding part of the piston pump 1.
  • the piston pump 1 further comprises a control device (not shown) for controlling the direction of movement of the piston 4, wherein the control device is designed to reverse the direction of movement of the piston 4 when the respective reversal point 24, 25 is reached.
  • the piston pump 1 further comprises a measuring device for measuring the piston speed, wherein the control device is designed to Speed value of the measured piston speed to reverse the direction of movement of the piston 4.
  • the piston pump 1 also has a measuring device for measuring a distance of the piston position 26 of the piston 4 from the reversal point in the direction of movement of the piston 4.
  • the Hall sensors 10 form components of the measuring device for measuring the piston speed, the piston position 26 or the distance and the direction of movement of the piston 4.
  • the control device is set up to reverse the direction of movement of the piston 4 when a certain speed value of the measured piston speed is undershot and a certain distance value of the measured distance is undershot.
  • Such a design of the piston pump 1 has the advantage that the switching process of the direction of movement of the piston 4 takes place solely on the basis of knowledge of internal measurement data or measured variables of the piston pump 1. It is therefore not necessary to record data about the state of the output device 5 and to transmit it to the control device of the piston pump 1.
  • the piston pump 1 can therefore be used completely independently of the specific dispensing device 5 used and can carry out the previously described process.
  • the piston pump 1 can therefore be used universally.
  • existing application systems 2 can be converted by replacing the piston pump 1 so that these application systems 2 can carry out the previously described process.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Reciprocating Pumps (AREA)

Claims (7)

  1. Procédé permettant de faire fonctionner une pompe à piston à double action (1) d'un système d'application (2) permettant d'appliquer un milieu coulant, en particulier un adhésif chauffé, à un substrat (3), dans lequel la pompe à piston (1) présente un piston (4) pouvant être déplacé entre un premier point d'inversion (24) et un deuxième point d'inversion (25), pour refouler le milieu coulant, dans lequel une inversion du sens de mouvement du piston (4) a lieu lorsque le point d'inversion (24, 25) respectif est atteint, dans lequel le système d'application (2) présente un dispositif de distribution (5) pour distribuer de manière intermittente le milieu coulant refoulé au moyen de la pompe à piston (1) vers le dispositif de distribution (5), dans lequel une distribution du milieu coulant au moyen du dispositif de distribution (5) est effectuée pendant des périodes de distribution, et une distribution du milieu coulant au moyen du dispositif de distribution (5) est interrompue pendant des périodes d'interruption, dans lequel une inversion du sens de mouvement du piston (4) est effectuée pendant au moins une période d'interruption des périodes d'interruption, dans lequel, au moment de l'inversion du sens de mouvement pendant ladite au moins une période d'interruption, le piston (4) se trouve dans une position intermédiaire entre le premier point d'inversion (24) et le deuxième point d'inversion (25).
  2. Procédé selon la revendication 1, dans lequel une inversion du sens de mouvement du piston (4) est effectuée en majeure partie pendant les périodes d'interruption, en particulier exclusivement pendant les périodes d'interruption.
  3. Procédé selon la revendication 1 ou 2, dans lequel un nombre des inversions du sens de mouvement qui sont effectuées dans des positions intermédiaires du piston (4) entre le premier point d'inversion (24) et le deuxième point d'inversion (25) est supérieur à un nombre des inversions du sens de mouvement qui sont effectuées aux points d'inversion (24, 25).
  4. Procédé selon l'une quelconque des revendications 1 à 3, dans lequel, pendant les périodes d'interruption, une vitesse de piston du piston (4) est réduite par rapport à une vitesse de piston pendant les périodes de distribution, en particulier la pompe à piston (1) est sujette aux fuites concernant le milieu coulant à refouler de sorte que pendant les périodes d'interruption, une vitesse de piston du piston (4) est réduite par rapport à une vitesse de piston pendant les périodes de distribution.
  5. Procédé selon la revendication 1 à 4, dans lequel la vitesse de piston est mesurée, et une inversion du sens de mouvement du piston (4) est effectuée lorsque la vitesse de piston est inférieure ou égale à une valeur déterminée, en particulier la valeur déterminée correspond à la vitesse de piston du piston (4) pendant les périodes d'interruption.
  6. Procédé selon l'une quelconque des revendications 1 à 5, dans lequel une distance du piston (4) par rapport au point d'inversion (24, 25) situé dans le sens de mouvement du piston (4) est déterminée, dans lequel une inversion du sens de mouvement du piston (4) est effectuée pendant la période d'interruption respective avant que le point d'inversion (24, 25) situé dans le sens de mouvement du piston (4) ne soit atteint lorsque la distance du piston (4) par rapport au point d'inversion (24, 25) situé dans le sens de mouvement du piston (4) est inférieure à une valeur déterminée,
    et/ou
    dans lequel une distance du piston (4) par rapport au point d'inversion (24, 25) situé à l'opposé du sens de mouvement du piston (4) est déterminée, dans lequel une inversion du sens de mouvement du piston (4) est effectuée pendant la période d'interruption respective avant que le point d'inversion (24, 25) situé dans le sens de mouvement du piston (4) ne soit atteint lorsque la distance du piston (4) par rapport au point d'inversion (24, 25) situé à l'opposé du sens de mouvement du piston (4) dépasse une valeur déterminée.
  7. Procédé selon l'une quelconque des revendications 1 à 6, dans lequel la vitesse de piston est mesurée, et une distance du piston (4) par rapport au point d'inversion (24, 25) situé dans le sens de mouvement du piston (4) est déterminée, dans lequel une inversion du sens de mouvement du piston (4) est effectuée lorsque la vitesse de piston est inférieure à une valeur déterminée et la distance du piston (4) par rapport au point d'inversion (24, 25) situé dans le sens de mouvement du piston est inférieure à une valeur déterminée,
    et/ou
    dans lequel la vitesse de piston est mesurée, et une distance du piston (4) par rapport au point d'inversion (24, 25) situé à l'opposé du sens de mouvement du piston (4) est déterminée, dans lequel une inversion du sens de mouvement du piston (4) est effectuée lorsque la vitesse de piston est inférieure à une valeur déterminée, et la distance du piston (4) par rapport au point d'inversion (24, 25) situé à l'opposé du sens de mouvement du piston (4) dépasse une valeur déterminée.
EP20172294.9A 2020-04-30 2020-04-30 Procédé de fonctionnement d'une pompe à piston à double action, pompe à piston à double action ainsi que système d'application permettant d'appliquer un milieu fluide à un substrat Active EP3904679B1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP20172294.9A EP3904679B1 (fr) 2020-04-30 2020-04-30 Procédé de fonctionnement d'une pompe à piston à double action, pompe à piston à double action ainsi que système d'application permettant d'appliquer un milieu fluide à un substrat
EP23168193.3A EP4219942A1 (fr) 2020-04-30 2020-04-30 Pompe à piston à double effet et système d'application pour appliquer un fluide sur un substrat
US17/244,879 US11766693B2 (en) 2020-04-30 2021-04-29 Method for operating double-acting piston pump of application system
CN202110483238.4A CN113578688A (zh) 2020-04-30 2021-04-30 用于运行活塞泵的方法、活塞泵以及涂覆系统
US18/231,123 US20230372963A1 (en) 2020-04-30 2023-08-07 Double-Acting Piston Pump Of Application System

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20172294.9A EP3904679B1 (fr) 2020-04-30 2020-04-30 Procédé de fonctionnement d'une pompe à piston à double action, pompe à piston à double action ainsi que système d'application permettant d'appliquer un milieu fluide à un substrat

Related Child Applications (2)

Application Number Title Priority Date Filing Date
EP23168193.3A Division EP4219942A1 (fr) 2020-04-30 2020-04-30 Pompe à piston à double effet et système d'application pour appliquer un fluide sur un substrat
EP23168193.3A Division-Into EP4219942A1 (fr) 2020-04-30 2020-04-30 Pompe à piston à double effet et système d'application pour appliquer un fluide sur un substrat

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EP3904679A1 EP3904679A1 (fr) 2021-11-03
EP3904679B1 true EP3904679B1 (fr) 2024-05-01

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EP20172294.9A Active EP3904679B1 (fr) 2020-04-30 2020-04-30 Procédé de fonctionnement d'une pompe à piston à double action, pompe à piston à double action ainsi que système d'application permettant d'appliquer un milieu fluide à un substrat
EP23168193.3A Pending EP4219942A1 (fr) 2020-04-30 2020-04-30 Pompe à piston à double effet et système d'application pour appliquer un fluide sur un substrat

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US (2) US11766693B2 (fr)
EP (2) EP3904679B1 (fr)
CN (1) CN113578688A (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220145875A1 (en) * 2020-11-09 2022-05-12 Hydrocision, Inc. System, apparatus, and method for motor speed control

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4286929A (en) * 1977-03-23 1981-09-01 Rodney T. Heath Dual pressure gas motor, and method of operation
DE2923621C2 (de) * 1979-06-11 1984-07-19 Walter 7758 Meersburg Holzer Anlage zur Ausnutzung der Sonnenwärme mit einem Sonnenwärmekollektor und einer Kraftmaschine
ES2064183B1 (es) 1992-02-27 1998-05-01 Razquin Murgui Jose Maria Sistema para mantenimiento de la presion en instalaciones suministradoras de materiales viscosos.
US5423662A (en) * 1993-04-22 1995-06-13 Binks Manufacturing Company Precision metered multiple fluid pumping system
DE10300280A1 (de) * 2003-01-08 2004-07-22 Itw Gema Ag Pumpeneinrichtung für Pulver, Verfahren hierfür und Pulverbeschichtungseinrichtung
JP4942449B2 (ja) * 2006-10-18 2012-05-30 株式会社コガネイ 薬液供給装置
EP2107241A3 (fr) 2008-04-02 2010-06-09 Flux Instruments AG Pompe à piston dotée d'un capteur de force et procédé de commande de ladite pompe
US9243626B2 (en) 2012-11-19 2016-01-26 Nordson Corporation Adhesive dispensing system and method including a pump with integrated diagnostics
US10046351B2 (en) * 2014-07-14 2018-08-14 Graco Minnesota Inc. Material dispense tracking and control
CN108139717B (zh) * 2015-09-11 2021-06-15 汉高知识产权控股有限责任公司 粘合剂的远程监控系统
DE202019000576U1 (de) * 2019-02-06 2019-02-28 TÜNKERS-NICKEL Dosiersysteme GmbH Vorrichtung zum Auftragen mittel- bis hochviskoser flüssiger Materialien

Also Published As

Publication number Publication date
US20210340964A1 (en) 2021-11-04
EP3904679A1 (fr) 2021-11-03
CN113578688A (zh) 2021-11-02
EP4219942A1 (fr) 2023-08-02
US11766693B2 (en) 2023-09-26
US20230372963A1 (en) 2023-11-23

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