EP3711864B1 - Procédé de régulation de la pression d'alimentation dans un système de recirculation pour un dispositif de revêtement et système de recirculation - Google Patents

Procédé de régulation de la pression d'alimentation dans un système de recirculation pour un dispositif de revêtement et système de recirculation Download PDF

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EP3711864B1
EP3711864B1 EP20163345.0A EP20163345A EP3711864B1 EP 3711864 B1 EP3711864 B1 EP 3711864B1 EP 20163345 A EP20163345 A EP 20163345A EP 3711864 B1 EP3711864 B1 EP 3711864B1
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Prior art keywords
pressure
control
circulation system
pressure regulator
regulator
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EP20163345.0A
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German (de)
English (en)
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EP3711864A1 (fr
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Herbert Timmer
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Timmer GmbH
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Timmer GmbH
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    • 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
    • B05B12/085—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 flow or pressure of liquid or other fluent material to be discharged
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B15/00—Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
    • B05B15/50—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter
    • B05B15/58—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter preventing deposits, drying-out or blockage by recirculating the fluid to be sprayed from upstream of the discharge opening back to the supplying means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B9/00—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour
    • B05B9/03—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material
    • B05B9/04—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material with pressurised or compressible container; with pump
    • B05B9/0403—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material with pressurised or compressible container; with pump with pumps for liquids or other fluent material
    • B05B9/0423—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material with pressurised or compressible container; with pump with pumps for liquids or other fluent material for supplying liquid or other fluent material to several spraying apparatus

Definitions

  • the invention relates to a method for regulating a supply pressure in a circulating system for a coating agent, comprising a pump, a coating device with at least one removal point, a material pressure regulator, a reservoir, a proportional pressure regulator and a control module.
  • the proportional pressure regulator is intended to control the material flow of the coating agent pump by means of the control module in such a way that, with a regulated supply pressure in the circulation system in the coating agent, the volume flow at the material pressure regulator is regulated via a predefined setpoint in the form of a control pressure.
  • the invention relates to a device/a system which comprises means for carrying out the method according to one of Claims 1 to 6 and a circulating system for applying the coating agent to a surface of a component.
  • Flowable or fluid media such as liquids or gases, are distributed in a large number of different applications. These media are either the material to be discharged themselves or are used to transport such a material, for example as an emulsion. For example, a paint or varnish can be applied to a workpiece to be coated by spraying.
  • Coating with the medium is typically done by spraying through spray nozzles.
  • pressurized lines are usually provided, which supply the respective spray nozzles with the medium.
  • a pressure circuit fed from a reservoir is usually set up. In this pressure circuit, the medium can be pumped around under pressure in order to be released via the spray nozzles if necessary.
  • the pressure of the medium therein drops. However, this also reduces the exit speed from the nozzle or nozzles. If the system pressure drops below a critical level, maintaining a desired distribution characteristic at the spray nozzles is no longer guaranteed or the removal of the medium or paint is restricted to such an extent that trouble-free operation is no longer possible.
  • Material pressure regulators can be used to maintain or keep the pressure in the system constant. This is in particular a fixed or adjustable pressure.
  • the material pressure regulator has a pressure chamber whose volume or cross section is variable. In this way, the pressure at the inlet of the pressure chamber can be adjusted. This is achieved by means of a counter-pressure to the pressure of the medium, which is set by applying a pressure medium, such as usually compressed air.
  • This pressure medium represents a counter-pressure to the pressure of the medium. This allows the cross section of the pressure chamber to be adjusted via movable wall sections as a function of the pressure ratio. If the pressure of the medium at the inlet of the Material pressure regulator compared to the back pressure, the cross section of the pressure chamber is reduced so that the pressure increases again. In this way, the pressure can be kept constant. The volume flow varies.
  • a volume flow is set at the material pressure regulator, which results not only from the material properties but also from the pre-pressure of the medium and the pressure in the pressure chamber of the material pressure regulator.
  • the pressure build-up in the ring main is usually carried out by pumps that set a pressure-controlled inlet pressure at the beginning of the ring main.
  • the amount of medium flowing through the material pressure regulator therefore results in a given system during operation from the set inlet pressure at the beginning of the ring line, the withdrawals from the ring line and the set outlet pressure of the material pressure regulator.
  • the setpoint on the material pressure regulator is usually preset for a system.
  • a minimum volume flow in the ring line is necessary for paints in order to keep them moving and to avoid segregation. For this purpose, manufacturer-specific specifications regarding the minimum volume flows must be observed.
  • the disadvantage of the method described above is that even when no material is to be removed, material is conveyed through the ring line at high pressure. This results in unnecessary energy consumption, wear of the medium due to shearing and abrasive wear of the components. During longer breaks in painting or at the weekend, the material pressure regulators are therefore often completely deactivated (opened) and the pump switched from pressure control to volume flow control.
  • the disadvantage of this method is that the pressure is no longer regulated and system-related faults or interventions in the system can lead to excess pressure.
  • the process only delivers a satisfactory result for one operating point in the painting shop, since different volume flows are set at the material pressure regulator with changing inlet pressures or paints with different viscosities.
  • the circulation system includes an operating loop (operating loop 14) and an idling loop (idling loop 20).
  • the system also generally includes a pump, a transmitter, a controller, a transducer, and a regulator.
  • a circulation system is disclosed in which a pump is provided for both the idling circuit and the working circuit. The pump thus feeds both circuits simultaneously. The pressures and volume flows in both systems are therefore not independent of each other, but influence each other.
  • U.S. 4,019,653A discloses a paint sprayer for proportioning and mixing two paint components for delivery to a spray gun.
  • the two components are a color component and a catalyst component, which when mixed are highly reactive and have a short pot life.
  • Catalyst and color component are connected to a spray device via a mixing chamber.
  • a back pressure regulator for regulating the pressure of a liquid in which the walls of the pressure chambers are formed from a plurality of movable sections.
  • an ink circulation system and method is known in which, in a first mode, which can be referred to as pressure or working mode, the pressure is kept constant by means of a material pressure regulator. In a second mode, which may be referred to as flow, sleep, or pause mode, the fluid pressure regulator is disabled.
  • a dosing pump connected upstream of the coating device can—in the activated state of the material pressure regulator—maintain a predetermined medium pressure between said dosing pump and the material pressure regulator.
  • the target value of the medium pressure is therefore set upon activation. In other words, the medium pressure at the material pressure regulator is only switched off to allow the medium to flow freely. The medium pressure is not regulated for this purpose on the material pressure regulator.
  • Abrasion can be influenced by a number of factors, such as medium pressure, coefficients of friction, temperature, viscosity of the medium and surface properties of the inner surface of the entire circulating system that is to be in contact with the medium. Due to unfavorable installation of the valve in the circulation system, e.g. B. directly behind bends or branches, there is no uniform flow of the material pressure regulator, which can cause high inaccuracies in the volume flow.
  • the dosing pump In the fully deactivated, i. H.
  • the dosing pump is also switched from pressure control to volume flow control, so that the medium pressure is no longer controlled. This can result in system-related faults or interventions in the circulating system, which can lead to excess pressure. It is also disadvantageous that different volume flows are set at the material pressure regulator with changing inlet pressures or media of different viscosities.
  • the object of the present invention is to overcome these disadvantages and to propose a new, improved method for regulating the supply pressure in a circulation system, the volume flow of which should remain constant at the material pressure regulator if there is no paint removal from the ring line, regardless of the media pressure set at the inlet of the ring line. Furthermore, a circulation system is to be proposed with which the new method can be implemented.
  • the regulation for a first supply pressure target value takes place with a first associated volume flow and a first control pressure.
  • the regulation takes place with a second associated volume flow and a second control pressure.
  • Which of the two (or additional) control pressures the material pressure regulator uses depends on one or more boundary conditions, namely the parameters of the coating agent and the flow resistances in the circulating system and a timing control.
  • Switching from the pressure or work mode to the flow or rest mode can take place automatically via control modules, for example via a PLC (programmable logic controller).
  • the volume flow can be reduced by reducing the supply pressure of the pump. Since the delivery rate drops when the line pressure is reduced, the material pressure regulator is opened further, i. H. the control pressure is reduced to such an extent that the volume flow at the material pressure regulator remains constant.
  • the PLC allows speed control with controlled acceleration or deceleration.
  • a control algorithm can be used in the programmable logic controller SPS to create a control program with which the control pressure at the material pressure regulator can be called up using various parameters such as pump pressure, volume flow, viscosity, geometric conditions of the entire circulation system, etc.
  • the flow resistances always lead to energy losses.
  • the causes for this are in particular the expansion or contraction of the medium, changes in flow cross sections, turbulence due to changes in flow direction and energy losses due to friction in general.
  • the local turbulence occurs, for example, at the deflections, cross-sectional constrictions, shut-off elements, branches, which, together with the length and diameter of the pipeline, the pressure drop between the influence the pump and material pressure regulator.
  • the difference in medium pressure at both ends also depends on its hydrostatic pressure.
  • the supply pressure is regulated down to a low pressure and the control pressure is set to the second control pressure by means of the material pressure regulator.
  • the second control pressure and the supply pressure are selected in such a way that a constant volume flow is achieved in the circulating system.
  • a lack of or reduced material removal at the point of use causes the proportional pressure regulator to switch to the second control pressure.
  • the second control pressure is then used as a basis for setting the pump performance of the pump to the second supply pressure target value, for example 0.5 bar.
  • the pump then starts to work in flow or energy saving mode.
  • a time offset is provided as an additional condition for switching. Switching from the second to the first control pressure, and thus indirectly also switching from the working mode to the idle mode, takes place when, on the one hand, no more coating material emerges from a delivery point and, on the other hand, a predefined time interval, for example 10 minutes, has expired.
  • the volume flow is selected in such a way that a minimum volume flow is conveyed that is required to avoid disturbances in the circulation system.
  • the minimum volume flow required depends in particular on the properties of the coating material and the circulation system. Paints and varnishes tend to separate and stick more than water or cleaning agents. The minimum volume flow for paint is therefore generally higher than the minimum volume flow for water or cleaning agent with the same circulation system. Since the properties of the system and coating agent are already known, corresponding default values with regard to the minimum volume flow can be predefined and then implemented when the control switches from "working mode" to "sleep mode".
  • the automatic tracking of the target value on the material pressure regulator ensures that a process-related, necessary, minimum flow rate is set, energy is saved and component wear is reduced of the entire circulation system is reduced. The pressure control is also maintained at a lower level.
  • the continuous pressure control in the ring main system enables a flexible change to both operating states, namely pressure mode and flow mode.
  • mode pressure mode or flow mode
  • the regulation of the pressure only causes a change in the currently activated circuit.
  • US 2006/0177565 A known system, in which an adjustment of the controller causes systemic pressure changes in both circuits, there is no mutual influence of the circuits in the system according to the invention. Undesirable pressure and flow fluctuations, which have an impact on the aging of the paint, are thus avoided and the paint in the circulation system is protected.
  • the control pressure at the material pressure regulator is preferably set to the first control pressure when the coating medium emerges from the at least one removal point.
  • the control thus reacts to the start of a coating process, ie the emergence of coating material from the point of delivery, in that the first control pressure is set on the material pressure regulator.
  • This first control pressure is provided by the proportional pressure regulator and acts on the membrane of the material pressure regulator. It is selected in such a way that it enables the coating device to be operated in a controlled manner with the supply pressure being as constant as possible in the entire supply line.
  • the first supply pressure target value is specified, ie the specification for the pump with regard to the quantity to be delivered. The pump is thus prompted by means of the first control pressure to implement a first supply pressure target value, for example 5 bar, and thus to work in the pressure or working mode.
  • a bypass routed around the material pressure regulator can be arranged on the ring line, which bypass comprises a valve, for example a ball valve, with which said bypass can be activated.
  • the valve can also be actuated automatically--if there is no material discharge from the at least one removal point--by it being controlled by the control module (PLC).
  • PLC control module
  • the activated bypass remains in place until the pick-up point, for example a paint outlet nozzle arranged on a robot arm, is actuated by remote control and releases the outlet of coating material. If removal of the coating agent is detected, the system can automatically switch to a higher pressure and the bypass can be deactivated.
  • the ball valve can be opened by the control signal coming from the control module (PLC) and at the same time the supply pressure can be reduced to the second, minimum setpoint (e.g. 0.5 bar) can be set.
  • PLC control module
  • the material pressure regulator can remain in operation.
  • the control module PLC controls the pump speed accordingly so that the supply pressure (e.g. 5 bar) is maintained in the circulation system.
  • the ball valve can allow overpressure relief if the supply pressure at the outlet of the coating material pump increases unexpectedly (e.g. as a result of a technical error). If an increase in pressure is detected, the ball valve can then be controlled accordingly by a control signal (from the PLC control module).
  • the control pressure can be controlled via the preferably electronically controlled, pneumatic proportional pressure regulator arranged on a pressure line (control line).
  • the proportional pressure regulator is used to adjust the pneumatic control pressure proportionally to a specified setpoint.
  • the input variable is continuously compared with the output pressure. If a control difference occurs, the proportional pressure controller adjusts.
  • a proportional pressure regulator designed for a maximum pressure of 5 or 6 bar is preferably selected.
  • a pressure sensor can be arranged in front of the dynamic pressure regulator.
  • the material pressure controller located at one end of the ring line acts as a dynamic pressure controller, which compares a "dynamic pressure signal" with a setpoint and outputs a corresponding control signal for controlling the proportional pressure controller.
  • better control behavior can be generated.
  • the first and the second control pressure can be calculated using a control algorithm, which can be created using the physical parameters of the coating agent and the flow resistances in the circulating system and the set supply pressure.
  • the control algorithm can be combined by creating a formula or in tabular form. For example, a simple formula for both operating and energy saving modes can be given by specifying the two specified supply pressures, the Volume flows and pump speed or the time can be created and programmed.
  • the stored data can be continuously read by the computerized control module (PLC).
  • control pressure on the material pressure regulator can be called up via a graphic characteristic field or via a simple flow measurement.
  • the first control pressure and/or the second control pressure and/or the pressure (P) is preselected via a time and/or a calendar time setting.
  • a time and/or a calendar time setting provision can be made, for example, for the control pressure to be set every day at 6:00 a.m. to a value which subsequently sets the supply pressure setpoint at the pump to 5 bar (working mode).
  • the control pressure is set to a value every day at 5 p.m.
  • control pressure can be selected on the basis of characteristic curves, a pressure measured at the pump or in the ring line system, the geometric conditions of the ring line system, the viscosity of the medium or other parameters.
  • the coating medium pump is preferably an electrically operated double-piston pump, which can be equipped with a pressure sensor.
  • the coating device can consist of a number of pick-up points, for example a number of spray devices, which each comprise a spray gun or a robot arm with a spray nozzle.
  • the material pressure regulator is used to regulate the dynamic pressure at the end of the coating agent flowing in the line system.
  • the medium pressure can be controlled remotely, e.g. for medium pressures dependent on speed or volume flow.
  • the material pressure regulator can be regulated via an electropneumatic converter or preferably via a direct control line (for example with compressed air).
  • the proportional pressure regulator is preferably a pneumatic type pressure regulator which regulates the output signal in proportion to an electrical input signal.
  • piezo-controlled proportional pressure regulators are used with different pressure conditions, since piezo technology enables very precise and rapid regulation to the desired pressure.
  • the control module is preferably a digital, programmable logic device for controlling and/or regulating the circulation system. If the system (circulation system) works with explosive or combustible substances, such as paint with solvents, the control module is preferably placed in a control room outside the hazardous area.
  • control pressure is preferably adjustable via a pressure regulator, for example via an above-mentioned electronically controlled, pneumatic proportional pressure regulator located on a pressure line (control line) or purely mechanically, for example via a spring that can be tensioned by a motor.
  • a pressure reducer which is connected upstream of the proportional pressure regulator, can also be arranged on the pneumatic control line. With the help of the pressure reducer, the outlet pressure of the compressed air can be regulated and possibly reduced if the outlet pressure exceeds its setpoint.
  • Pressure sensors, pressure regulators and microcontrollers can also be used to set the pneumatic control pressure.
  • the control pressure can also be regulated via a flow measurement, in that a flow meter records a volume flow in a unit of time.
  • At least one flow meter can be arranged on the ring line of the circulating system, with which a flow rate, ie a volume flow (for example liters per minute) can be recorded.
  • the flow meter can be equipped with an analog or digital interface.
  • the flow meter can, for example, work according to the toothed wheel or oval wheel principle and can be installed in the ring line and connected to the control module.
  • Non-invasive flow meters such as ultrasonic flow sensors, can also be used.
  • the flow meter is preferably placed between the coating device and the material pressure regulator.
  • the coating agent pump and the proportional pressure regulator can be controlled wirelessly or via lines using the data from the flow sensor and pressure sensor.
  • the medium pressure in the circulation system can be maintained or kept constant.
  • This can in particular be a fixed or adjustable medium pressure.
  • the material pressure regulator has a pressure chamber whose volume or cross section is variable. In this way, the pressure at the inlet of the pressure chamber can be adjusted. This is achieved by means of a counter-pressure to the pressure of the medium, which is set by applying a pressure medium, such as usually compressed air.
  • This pressure medium represents a counter-pressure to the pressure of the medium.
  • This allows the cross section of the pressure chamber to be adjusted via movable wall sections as a function of the pressure ratio. If the pressure of the medium at the inlet of the material pressure regulator falls compared to the back pressure, the cross section of the pressure chamber is reduced so that the pressure rises again.
  • volume flow varies.
  • a volume flow is set at the material pressure regulator, which results from the pre-pressure of the medium and the pressure in the pressure chamber of the material pressure regulator as well as from the material properties (parameters of the medium).
  • At least one coating medium pump such as a piston, eccentric worm or gear pump, can be provided for the material transport.
  • An electrically driven double-piston pump is preferably provided, which reduces the pulsation that negatively influences the spray pattern. The pump automatically reduces its speed when a specified pressure is reached and automatically increases it when the medium pressure drops below the specified setpoint.
  • An electronic volume flow sensor for example a volume flow transmitter based on the differential pressure, Coriolis, ultrasound, turbine principle or the variable area measuring principle, which can also include additional connections for pressure and/or temperature transmitters, can be used to record the volume flow.
  • the viscosity of the medium can be automatically detected, for example, using a viscometer with moving measuring bodies that is known per se.
  • BPR material pressure regulator
  • the pressure is not regulated at a single defined pressure level, but at different pressure levels that can be adapted to different requirements. For example, in pressure mode, a high pressure can be maintained to enable a uniform supply of coating agent. At another time, a minimum circulation of the coating agent can be implemented analogously to this in the energy-saving mode at a reduced pressure level. This effectively avoids the initially explained disadvantages of deactivating the material pressure regulator.
  • the 1 schematically shows a circulation system 100, comprising a ring line 12, a reservoir 16 with an agitator (not shown) for homogenizing a medium, such as paint (e.g. car paint), a coating medium pump 18, a coating device 10 and a material pressure regulator 15.
  • a medium such as paint (e.g. car paint)
  • paint e.g. car paint
  • a coating medium pump 18 e.g. a coating medium pump 18
  • a coating device 10 e.g. car paint
  • the minimum flow rate of the medium in the ring line 12 should exceed the value 0.35 m/s.
  • the amount of medium in circulation, such as paint or varnish, should also be significantly higher than the purchase amount.
  • the coating device 10 includes several, in the present case four removal points 11 (spray applicators) for coating work parts with the car paint.
  • the coating device 10 (spray booth) is part of a painting system for painting bodywork components.
  • the material pressure regulator 15 comprises a schematically indicated pressure chamber 29 with a variable volume.
  • the medium pressure is applied to an inlet 28 of the pressure chamber 29 via a pressure line 25 with a control medium (compressed air), with which a counter-pressure (control pressure PS) to the supply pressure P is exerted.
  • the compressed air is guided from a pressure container 17 via a pressure reducer 21 and a proportional pressure regulator 22 downstream of the pressure reducer 21 to the lateral pressure piston of the material pressure regulator 15 (not shown here).
  • the two in one symmetrically arranged pressure pistons exert pressure on the wall of the pressure chamber 29 perpendicular to the direction of flow of the coating agent (paint, varnish), whereby the cross section of the pressure chamber 29 can be adjusted via movable wall sections depending on the pressure ratio.
  • the task of the pressure reducer 21 is to regulate or reduce the different pressure influences on its input side, so that the output pressure (of compressed air) does not exceed a predetermined value.
  • the pressure reducer 21 is controlled without auxiliary power.
  • the control medium of the pressure reducer 21 is the compressed air itself. Its valve closes when the pressure behind the valve increases.
  • the electronically controlled proportional pressure controller 22 is used to set the pneumatic control pressure PS proportional to a specified setpoint.
  • the pressure at the working connection is recorded by means of a pressure sensor (not shown) and compared with the target value.
  • a first control pressure PS1 corresponds to the regular operation of the coating device 10 with a supply pressure P1 that is as constant as possible.
  • a second control pressure PS2 is defined to represent the minimum supply pressure P2 (power saving mode). Any deviations of the pressure P1 or P2 from the respective desired value are corrected by means of the proportional pressure controller 22, so that the pressure P1 or P2 is brought back to the desired value.
  • the coating medium pump 18 is equipped with an external pressure sensor 20 and with digital inputs and outputs (not shown).
  • a programmable logic control module 19 PLC
  • PLC programmable logic control module
  • the 2 shows the same circulation system 100 with the difference that a flow meter 26 with analog interface is placed on the ring line 12 between the coating device 10 and the material pressure regulator 15, which is also controlled by the control module 19 (PLC).
  • the flow meter 26 records the flow rate, ie a volume flow.
  • a flow meter 26 On the ring line 12 between the coating device 10 and the material pressure regulator 15 is according to 3 a flow meter 26 arranged with a digital interface and a user-friendly, large display.
  • a circulation system 200 is shown, which consists of the same parts as in 1 are shown, there is a bypass 23 guided around the material pressure regulator 15 being arranged on the ring line 12 .
  • a ball valve 24 is mounted on the bypass 23, with which the bypass 34 can either be blocked or released.
  • a first pressure regulation of the liquid medium here: car paint
  • the setpoint at the material pressure regulator 15 is set to a first supply pressure setpoint P1 adapted to the pressure mode of the coating device 10 and to a second, significantly lower supply pressure P2 (second supply pressure setpoint P2) corresponding to weekend operation.
  • the first setpoint supply pressure value P1 is 5 bar and the second setpoint supply pressure value P2 is 0.5 bar.
  • the values P1 and P2 are matched to one another in such a way that the minimum flow rate of the medium in the ring line 12 is maintained at 0.35 m/s.
  • other setpoint supply pressure values P1, P2 or minimum flow rates can also be predefined.
  • control pressure at the material pressure regulator 15 is regulated by means of the programmable logic control module (PLC) in such a way that a constant volume flow is set regardless of the set supply pressure.
  • PLC programmable logic control module
  • the ball valve 24 which is arranged on the bypass 23 is closed when the coating device 10 comprising a plurality of delivery points 11 is in regular operation and requests the paint.
  • the paint (coating agent 30) is shown schematically in Figures 1 to 4 shown as a spray jet.
  • the control module 19 PLC controls the speed of the coating agent pump 18 in such a way that the supply pressure P1 (5 bar) in the circulation system is kept constant.
  • the ball valve 24 opens automatically by a control signal coming from the control module 19 (PLC) and at the same time the first setpoint supply pressure value P1 is switched to the second setpoint value P2.
  • PLC control module 19
  • the circulation system is thus in the energy-saving mode with the minimum flow rate.
  • the minimum flow rate of the medium in the ring line 12 should be at least 0.35 m/s for some paints, for example.
  • the bypass 23 with the ball valve 24 is used in a timing control.
  • the ball valve 24 remains open, for example, on weekends or holidays to maintain the minimum supply pressure in the circulating system.

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  • Coating Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Claims (14)

  1. Procédé de régulation d'une pression d'alimentation (P) dans un système de recirculation (100; 200) pour un agent de revêtement (30), comprenant :
    - une pompe (18),
    - une installation de revêtement (10) pourvue d'au moins un point de prélèvement (11),
    - un régulateur de pression de matière (15),
    - un réservoir (16),
    - un régulateur de pression (22), et
    - un module de commande (19),
    dans lequel le régulateur de pression (22) est prévu pour commander au moyen du module de commande (19) le flux de matière de la pompe à agent de revêtement (18) de telle sorte que pour une pression d'alimentation (P) régulée dans le système de recirculation (100, 200) dans l'agent de revêtement (30), une valeur de consigne prédéfinie sous la forme d'une pression de commande (PS) permet de réguler le débit volumique au niveau du régulateur de pression de matière (15),
    la pression de commande (PS) pouvant être réglée de manière variable sur la base d'un paramètre physique mesuré dans l'agent de revêtement en fonction de la pression d'alimentation (P) réglée de sorte que dans le système en anneau (100, 200) une régulation de pression continue est possible sur :
    - une première valeur de consigne (P1) avec un premier débit volumique associé et une première pression de commande (PS1), et
    - au moins une deuxième valeur de consigne (P2) avec un deuxième débit volumique associé et une deuxième pression de commande (PS2),
    et dans lequel, en cas d'absence de sortie ou de sortie réduite de l'agent de revêtement (30) du au moins un point de prélèvement (11), la pression d'alimentation (P) est diminuée à une pression réduite et la pression de commande (PS) est réglée au moyen du régulateur de pression de matière (15) sur la deuxième pression de commande (PS2), dans lequel la deuxième pression de commande (PS2) et la pression d'alimentation (P2) sont sélectionnées de façon à réaliser dans le système de recirculation (100, 200) un débit volumique préréglé (Vk), et dans lequel le débit volumique constant (Vk) est sélectionné en fonction des propriétés de l'agent de revêtement (30) à refouler de façon à refouler un débit volumique (Vmin) nécessaire au minimum pour éviter des perturbations dans le système de recirculation (100, 200),
    caractérisé en ce que le réglage de la pression de commande (PS) est effectué
    - sur la base de résistances à l'écoulement dans le système de recirculation (100, 200);
    - et au moyen d'une synchronisation en fonction de la pression d'alimentation (P) réglée.
  2. Procédé selon la revendication 1, caractérisé en ce qu'à la sortie de l'agent de revêtement (30) du au moins un point de prélèvement (11), la pression de commande (PS) est réglée au moyen du régulateur de pression de matière (15) sur la première pression de commande (PS1), la première pression de commande (PS1) étant sélectionnée de telle sorte qu'elle permet un fonctionnement normal de l'installation de revêtement (10) avec une pression d'alimentation (P1) aussi constante que possible dans toute la conduite d'alimentation.
  3. Procédé selon l'une quelconque des revendications 1 ou 2, caractérisé en ce qu'en cas d'absence d'écoulement de matière du au moins un point de prélèvement (11), une dérivation (18) autour du régulateur de pression de matière (15) est activée et maintenue jusqu'à ce que ledit au moins un point de prélèvement (11) soit activé et l'agent de revêtement (30) sorte du point de prélèvement (11).
  4. Procédé selon l'une quelconque des revendications 1 à 3, caractérisé en ce que la pression de commande (PS) est commandée par l'intermédiaire du régulateur de pression (22), de préférence pneumatique, disposé sur une conduite sous pression (25), et le régulateur de pression de matière (15) sert de régulateur de pression dynamique à l'extrémité de la conduite.
  5. Procédé selon l'une quelconque des revendications 1 à 4, caractérisé en ce que la première et la deuxième pression de commande (PS1, PS2) sont calculées par l'intermédiaire d'un algorithme créé à l'aide des paramètres physiques de l'agent de revêtement (30) et des résistances à l'écoulement dans le système de recirculation (100; 200) et de la pression (P) réglée, et/ou sont extraites par l'intermédiaire d'un réseau de caractéristiques ou par l'intermédiaire d'une mesure de débit.
  6. Procédé selon l'une quelconque des revendications 1 à 5, caractérisé en ce que la première pression de commande (PS1) et/ou la deuxième pression de commande (PS2) et/ou la pression (P) sont présélectionnées par l'intermédiaire de l'heure et/ou d'une temporisation calendaire.
  7. Dispositif/Système de traitement de données, comprenant:
    - des moyens permettant d'exécuter le procédé selon l'une quelconque des revendications 1 à 6 et
    - une régulation de la pression d'alimentation (P) dans un système de recirculation (100; 200) qui comprend un régulateur de pression de matière (15), un régulateur de pression (22) et un module de commande (19).
  8. Système de recirculation (100; 200), comprenant
    - une pompe à agent de revêtement (18),
    - une installation de revêtement (10) pourvue d'au moins un point de prélèvement (11),
    - un régulateur de pression de matière (15),
    - un réservoir (16),
    - un régulateur de pression (22),
    - un module de commande (19), et
    - un dispositif/système de traitement de données selon la revendication 7.
  9. Système de recirculation (100; 200) selon la revendication 8, caractérisé en ce que la pression de commande (PS) peut être commandée par l'intermédiaire du régulateur de pression (22), de préférence pneumatique, situé sur la conduite sous pression (25).
  10. Système de recirculation (100; 200) selon la revendication 8 ou 9, caractérisé en ce qu'au moins un débitmètre analogique ou numérique est prévu sur la conduite annulaire (12), qui est positionné de préférence entre l'installation de revêtement (10) et le régulateur de pression de matière (15).
  11. Système de recirculation (100; 200) selon l'une quelconque des revendications 8 à 10, caractérisé en ce que dans le système de recirculation (100) est installé un module de commande par programme enregistré (19) qui est relié par l'intermédiaire de conduites (27) au moins à la pompe à agent de revêtement (18), au capteur de pression (20) et au régulateur de pression (22).
  12. Système de recirculation (100; 200) selon l'une quelconque des revendications 8 à 11, caractérisé en ce que la pompe à agent de revêtement (18) et/ou le capteur de pression (20) et/ou le régulateur de pression (22) et/ou le débitmètre (26) sont rattachés sans fil au module de commande (19).
  13. Système de recirculation (200) selon l'une quelconque des revendications 8 à 12, caractérisé en ce qu'une dérivation (23) acheminée autour du régulateur de pression de matière (15) est disposée sur la conduite en anneau (12), et la dérivation (23) peut être activée au moyen de l'actionnement d'une vanne (24).
  14. Système de recirculation (100; 200) selon l'une quelconque des revendications 8 à 13, caractérisé en ce que de préférence un régulateur de contre-pression pourvu d'une chambre de pression (29) variable, présentant au moins une paroi flexible est prévue comme régulateur de pression de matière (15) de sorte que le volume de la chambre de pression (29) est variable.
EP20163345.0A 2019-03-19 2020-03-16 Procédé de régulation de la pression d'alimentation dans un système de recirculation pour un dispositif de revêtement et système de recirculation Active EP3711864B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102019106965.3A DE102019106965A1 (de) 2019-03-19 2019-03-19 Verfahren zur Regelung des Versorgungsdruckes in einem Umlaufsystem für eine Beschichtungseinrichtung und Umlaufsystem

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EP3711864B1 true EP3711864B1 (fr) 2023-04-19

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4019653A (en) * 1975-08-22 1977-04-26 Graco Inc. Automatic proportioning paint spray system
US20060177565A1 (en) * 2005-02-07 2006-08-10 Shubho Bhattacharya Paint circulation system
US7828527B2 (en) * 2005-09-13 2010-11-09 Illinois Tool Works Inc. Paint circulating system and method
DE102017110430A1 (de) * 2017-05-12 2018-11-15 Timmer Gmbh Materialdruckregler

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