EP0636420B2 - Pulverfördervorrichtung, insbesondere für Beschichtungspulver - Google Patents
Pulverfördervorrichtung, insbesondere für Beschichtungspulver Download PDFInfo
- Publication number
- EP0636420B2 EP0636420B2 EP94108909A EP94108909A EP0636420B2 EP 0636420 B2 EP0636420 B2 EP 0636420B2 EP 94108909 A EP94108909 A EP 94108909A EP 94108909 A EP94108909 A EP 94108909A EP 0636420 B2 EP0636420 B2 EP 0636420B2
- Authority
- EP
- European Patent Office
- Prior art keywords
- air
- powder
- conveyor
- rate
- ref
- 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.)
- Expired - Lifetime
Links
- 239000000843 powder Substances 0.000 title claims description 119
- 239000011248 coating agent Substances 0.000 title claims description 16
- 238000000576 coating method Methods 0.000 title claims description 16
- 238000010586 diagram Methods 0.000 claims description 31
- 238000009434 installation Methods 0.000 claims description 2
- 239000007921 spray Substances 0.000 description 10
- 238000005507 spraying Methods 0.000 description 7
- 230000006870 function Effects 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 3
- 239000012530 fluid Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 241001136792 Alle Species 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000003205 fragrance Substances 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 229940098458 powder spray Drugs 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
- B05B7/14—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas designed for spraying particulate materials
- B05B7/1404—Arrangements for supplying particulate material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
- B05B12/08—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means
- B05B12/085—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
- B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
- B05B5/16—Arrangements for supplying liquids or other fluent material
- B05B5/1683—Arrangements for supplying liquids or other fluent material specially adapted for particulate materials
Definitions
- the invention relates to a powder conveying device, especially for coating powder, according to the Preamble of claim 1.
- Injectors working according to the Venturi tube principle as jet pumps for the pneumatic conveying of Coating powders are from DE-PS 1 266 685 (U.S. Patent 3,504,945).
- Spraying devices in Form of spray guns for electrostatic spray coating of objects with coating powder are known from US Pat. No. 4,196,465.
- From the DE-OS 39 26 624 A1 it is known an injector conveying air flow and supply an additional air flow to an injector. The conveying air flow is used to generate a Vacuum, which sucks powder into the injector, and to transport the sucked powder to a Spraying device with which the powder is directed towards you coating object is sprayed.
- the additional air serves to adjust the strength of the negative pressure or to maintain a certain amount of total air, if the conveying air volume is below one certain value drops. So that the total air volume can be kept at a desired value the conveying air and the additional air are separated in this way regulated that the total air volume regardless of the proportions of conveying air and additional air has the desired constant value.
- the air is to be conveyed of the powder required.
- the total airflow must have a certain minimum speed, because at a speed of the powder-air mixture pulsations of less than 10-15 m / sec Powder-air mixture flow occur in the fluid lines. However, there is too much or too quickly flowing air undesirable because it is the cloud of sprayed powder and undesirably affects the coating quality.
- a too strong air flow can from the to Blow away powder coating surface.
- the Powder flow rate spray Powder quantity per unit of time
- a practical value for the powder rate is 300 g / min. ever according to the required coating thickness on the coating object and dependent on others Criteria such as type of powder or surface shape of the object to be coated it is desirable to increase or decrease the powder delivery rate humiliate.
- the delivery air rate and the additional air rate can be set so that the desired Powder delivery rate is generated, however, the total air delivery rate consisting of conveying air and additional air constant remains or assumes a desired value.
- the necessary settings of the conveying air rate and the additional air rate are in DE-OS 39 26 624 A1 made by hand.
- the delivery air rates and Additional air rates are set on pressure regulators. On certain pressure results in the pipe system a certain amount of subsidized plant Air per unit time. Due to many unknown pressure drops and changing flow cross sections in the The "pressure control” is not a powder conveying device very accurate. More precise would be a "volume control", through which the "volume of funded per unit of time Conveying air "and the" volume of per unit time conveyed additional air "is regulated. Volume regulator and sensors for determining the air volume conveyed are known, but not to promote powder.
- the object of the invention is to be achieved to create a device in which with less Time and less manpower required setting of the conveying air quantity per unit of time and the additional air volume per time unit possible is when a desired powder flow per unit of time for a desired total air flow is set or changed per unit of time.
- the invention has the following advantages in particular: After saving a calibration diagram for a certain powder systems, especially electrostatic Powder spray coating system, can desired amount of powder delivered per unit of time easily changed and at this The change is completely automatic and is retained the required total air volume required new amount of funded per unit of time Conveying air and additional air delivered per unit of time.
- Several diagram lines can be saved in the diagram be, of which each diagram line is one certain total air volume delivered per unit of time represents which of a diagram axis with the powder quantities on another diagram axis for Conveying air volumes for a certain amount of powder required amount of conveying air is "mirrored” can. This "mirroring" means “reading” or 'calculate' by the computer.
- the powder conveying device according to the invention for coating powder shown in FIG. 1 contains an injector 2, in which, according to the principle of a Venturi tube, a conveying air flow of a conveying air line 4 generates a negative pressure in a negative pressure area 6, through which powder 8 is sucked in from a powder container 10 and then from the conveying air flow is further transported through a powder-air line 12 to an electrostatic powder spraying device 16, which charges the powder electrostatically and sprays along an arrow 18 onto an object 20 to be coated.
- the spray device 16 can contain a high voltage generator for charging the powder or can be connected to an external high voltage source.
- the drawings show an embodiment in which the high voltage generator is integrated in the spray device 16 and the desired high voltage can be set via an electrical line 22 and a computer 24.
- the high voltage for electrostatically charging the powder can be in the range between 0 and 140,000 volts and can be set as desired.
- An additional air flow 26 can be used to add an additional air flow to the conveying air flow in the vacuum region 6.
- the additional air flow of the additional air line 26 can be introduced into the conveying air flow at a location located downstream of the vacuum region 6, either still within the injector 2 or at a location located downstream of it in the powder-air line 12.
- the conveying air passes from a compressed air source 30 via a conveying air regulator 32 into the conveying air line 4.
- the additional air arrives from the compressed air source 30 via an additional air regulator 34 into the additional air line 26.
- the two regulators 32 and 34 can be compressed air regulators, but are volume flow regulators in the preferred embodiment shown which regulate the volume of air flowing through them per unit of time.
- the conveying air volume flow controller 32 receives a conveying air volume setpoint signal FV-Soll from the computer 24 via an electric conveying air volume setpoint line 36 and from an conveying air volume sensor 38 in the conveying air line 4 via an electric conveying air volume actual value line 40 an electric conveying air volume Actual value signal FV-actual.
- the conveying air volume flow controller 32 regulates the conveying gas volume flowing through it per unit time as a function of this setpoint signal and this actual value signal of the lines 36 and 40.
- the additional air volume flow controller 34 receives an electrical additional air volume set value signal ZV-Soll from the computer 24 via an electrical additional air volume set value line 42 and an electrical additional air volume actual value sensor 44 in the additional air line 26 via an electrical additional air volume actual value line 46 Additional air volume actual value signal ZV-Ist.
- the additional air volume flow controller 34 regulates the additional air quantity flowing through it per time unit as a function of this setpoint signal ZV-Soll of the line 42 and this actual value signal ZV-Ist of the line 46. Since air has a different volume depending on the pressure and temperature, the two volume pressure regulators 32 and 34 are calibrated so that they convey a so-called standard cubic meter "Nm 3 " per hour at an atmospheric pressure and a temperature of 0 ° C.
- a plurality of predetermined powder delivery rates (delivered powder quantity per unit time "m", for example in g / min) on a diagram axis and a plurality of delivery air rates (delivered delivery air per unit time "on a second diagram axis running at right angles to it).
- FV " for example in Nm 3 / h
- GV total air conveyed per unit of time consisting of conveying air and possibly additional air added
- the corresponding conveying air volume value FV1 or FV2 is obtained for the desired total air volume value GV1 by going from the value m1 or m2 parallel to the conveying air volume axis FV to the total air volume straight line GV1, and then parallel to the powder mass axis m to the conveying air volume axis FV.
- the conveying air volume values are plotted, for example, in Nm 3 / h on the conveying air volume axis FV.
- Each powder spraying device 16 of a powder coating system can have conveying air lines, additional air lines and powder-air lines of different lengths and with different cross sections.
- a calibration chart corresponding to calibration chart 50 may be stored in computer 24.
- a line can be stored in the calibration diagram 50 for several total air volume values, via which a line for a specific powder mass value such as m1 or m2 can be determined for a corresponding conveying air volume value FV1 or FV2.
- a straight line for a total air volume value GV1 and a dashed line for another total air volume value GV2 are stored in diagram 50.
- a conveying air volume FV1 ' is required for a desired powder mass per unit time m1.
- the computer 24 calculates the additional air volume value ZV from the total air volume GV2 and the calculated conveying air volume FV1 ′, which is not contained in the diagram 50, but is given by the computer 24 as an additional air volume setpoint signal ZV-Soll on the electrical line 42 to the additional air volume flow controller 34 ,
- the conveying air volume value FV for example FV1 'or FV1 or FV2, which can be taken from the diagram, is given by the computer 24 to the conveying air volume flow controller 32 as an electric conveying air volume setpoint signal FV-Soll on the electrical line 36.
- the desired powder mass target value "m target" can be variably entered into the computer 24 at an input 52.
- the total fragrance volume setpoint "GV-Soll" can be variably entered into the computer 24 at an input 54.
- a powder mass sensor 56 which can be accommodated in the injector 2 or can be arranged downstream of it on the powder-air line 12, generates an electrical signal as a function of the powder mass "m” conveyed per unit of time by the total air flow (conveying air plus any additional air added) Powder mass actual value signal m-lst and transmits this on an electrical line 58 to a powder mass actual value input 60 of the computer 24.
- the computer 24 calculates from the powder mass target value signal m target at its input 52 and the powder mass Actual value signal m-actual is a powder mass-target-actual comparison signal at its input 60 and uses this as powder mass signal m1, m2 etc.
- the powder mass value "m" selected for the calculation on the powder mass diagram axis m is only the same size as the target powder mass value m setpoint entered at input 52 if the actual powder mass value m-actual of the powder mass sensor 56 is equal to the powder mass target value m-target is.
- the computer usually contains at least one processor and a data memory.
- a quantity funded per unit of time can also referred to as the "rate”. Therefore, below also the expressions powder mass rate, conveying air rate and additional air rate used.
- the computer 24 is also provided with an input 62 for setting a high voltage setpoint HS setpoint provided, depending on which of the computers 24 via the electrical line 22 of the spray device 16 a signal for setting the High voltage sends. This allows the entire powder delivery device away from computer 24 from the spray device 16 and removed from the volume flow controllers 32 and 34 are controlled and regulated.
- auxiliary air pressure regulator 134 instead of the additional air volume flow controller 34 in the additional air path between the compressed air source 30 and the additional air line 26 arranged and the still existing Auxiliary air volume controller 34 generates one to the electrical one Auxiliary air volume setpoint signal ZV setpoint from Fig. 1 corresponding electrical additional air pressure setpoint signal ZP target, which via an electrical Setpoint signal line 142 to the additional air pressure regulator 134 is supplied.
- the air pressure regulator 132 receives from one Compressed air sensor 138 in the conveying air line 4 via a electrical delivery air pressure actual value line 140 electrical Air pressure actual value signals FP-actual, compared these actual value signals FP-actual with the electrical delivery air pressure setpoint signals FP target of electrical Conveying air pressure setpoint signal line 136 of the conveying air volume flow controller 32 and regulates depending from the comparison result the conveying air pressure with which the conveying air from the compressed air source 30 via the Conveying air line 4 is fed to the injector 2.
- the Delivery air volume flow controller 32 receives from the delivery air volume flow sensor 38 in the conveying air line 4 via the electrical conveying air volume actual value line 40 electrical conveying air volume actual value signals FV actual as in the embodiment shown in Fig. 1. This is 3 is a "volume flow control".
- the auxiliary air pressure regulator 134 receives from one Compressed air sensor 144 in the additional air line 26 via an electrical additional air pressure actual value line 146 electrical additional air actual value signals ZP-actual, compared with the additional air setpoint signals ZP-Soll der Auxiliary air pressure setpoint line 142 and generated in An additional air pressure depending on the comparison result, with which the additional air from the compressed air source 30 of the auxiliary air line 26 is supplied.
- the Additional air volume flow controller 34 receives from that Auxiliary air volume flow sensor 44 in the auxiliary air line 26 via the electrical additional air volume actual value line 46 electrical additional air volume actual value signals ZV is as in the embodiment shown in Fig. 1. As a result, the additional air control is also in FIG. 3 a "volume flow control".
- the conveying air volume flow controller 32 and the Additional air volume flow controller 34 can accordingly Fig. 1 outside of the computer 24 as a separate one devices connected to him or trained accordingly Fig. 3 integrated in the computer and partially or entirely through the software and / or hardware of the computer 24 may be formed.
- Fig. 3 are as Part of the computer 24 that is stored in it Diagram 50 and schematically by a square 124 the hardware and software of the computer 24 as well the dependency of diagram 50, the conveying air volume flow controller 32 and the additional air volume flow controller 34 shown from each other.
- the term "computer” here means an electrical one Control device, which in addition to Basic components processor, memory, input and output units also other electronic or electrical May contain elements.
- a system for electrostatic powder coating usually has multiple spray devices 16. Each spraying device requires the one in FIGS 3 elements shown. However, the computer can 24 be trained so that a single computer 24 perform the functions for all spray devices 16 can.
- Fig. 3 shows a central electronic control system 200 for multiple spray devices 16, the each have their own computer 24.
- the computer are in one with the central control system 200 bidirectional data exchange, which is schematic in Fig. 3 is represented by a double arrow 202.
- the Computer 24 receives from central control system 200 in each case the powder mass setpoint m-set Total air volume setpoint GV set, and if desired, also the high voltage setpoint HS setpoint, which is the desired high voltage value, with which the spray device 16 electrostatically the powder should charge.
- Another modified embodiment can consist of the computer 24 in the central Control system is included.
Landscapes
- Electrostatic Spraying Apparatus (AREA)
- Air Transport Of Granular Materials (AREA)
- Paints Or Removers (AREA)
Description
- Fig. 1
- schematisch eine Pulverfördervorrichtung für Beschichtungspulver gemäß der Erfindung,
- Fig. 2
- einen Längsschnitt durch einen Injektor von Fig. 1,
- Fig. 3
- schematisch eine weitere Ausführungsform einer Pulverfördervorrichtung für Beschichtungspulver gemäß der Erfindung als Teil einer Pulverbeschichtungsanlage, welche mehrere solcher Pulverfördervorrichtungen enthält, welche alle von einer gemeinsamen zentralen Steueranlage gesteuert werden.
Claims (11)
- Pulverfördervorrichtung, insbesondere für Beschichtungspulver, mit folgenden Merkmalen:
mit einem Injektor (2), in welchem nach dem Prinzip eines Venturirohres ein Förderluftstrom einer Förderluftleitung (4) einen Unterdruck erzeugt, durch welchen Pulver aus einem Pulverbehälter (10) angesaugt und dann vom Förderluftstrom durch eine Pulver-Luft-Leitung (12) weitertransportiert wird; mit einem Zusatzluftstrom einer Zusatzluftleitung (26), welcher im Unterdruckbereich oder an einer stromabwärts davon gelegenen Stelle dem Förderluftstrom hinzugefügt werden kann; mit einem Förderluftregler (32; 32, 132); mit einem Zusatzluftregler (34; 34, 134); mit einem Computer (24);
dadurch gekennzeichnet,daß im Computer (24) als Eichdiagramm (50) eine Vielzahl vorbestimmter Pulverförderraten, geförderte Pulvermasse (m) pro Zeiteinheit, als eine erste Diagrammachse und eine Vielzahl von Förderluftraten, geförderte Förderluft (FV) pro Zeiteinheit, als eine zweite Diagrammachse gespeichert sind, wobei die Förderluftraten (FV) bei einer bestimmten Gesamtluftrate (GV) bestehend aus Förderluft (FV) und gegebenenfalls hinzugefügter Zusatzluft (ZV) zur Erzeugung der Pulverförderraten (m) erforderlich sind und durch Versuche ermittelt wurden; daß der Computer (24) einen Pulverraten-Sollwert-Eingang (52) zur Eingabe eines gewählten Pulverraten-Sollwertes (m-Soll) und einen Gesamtluftraten-Sollwert-Eingang (54) zur Eingabe eines Vorbestimmten Gesamtluftraten-Sollwertes, aufweist;daß der Computer (24) dem Diagramm (50) entsprechend programmierte Software und/oder programmierte Hardware enthält, welche für einen eingegebenen Pulverraten-Sollwert (m-Soll) aus dem Diagramm (50) in Abhängigkeit von der vorbestimmten Gesamtluftrate (GV) die dafür erforderfiche Förderluftrate (FV) und die dafür erforderliche Zusatzluftrate (geförderte Zusatzluft ZV pro Zeiteinheit) errechnen und in Abhängigkeit von dem Berechnungsergebnis und in Abhängigkeit von einem Pulvermassenstrom-Istwert (m-Ist) welcher von einem Pulvermasse-Istwertsensor (56) erzeugt wird, einen Förderluftrate-Sollwert (FV-Soll; FV-Soll und FP-Soll) und einen Zusatzluftrate-Sollwert (ZV-Soll; ZV-Soll und ZP-Soll) erzeugen; wobei der Computer (24) aus dem Pulverrate-Sollwert (m-Soll) an seinem Eingang (52) und dem Pulvermassenstrom-Istwert (m-Ist) ein Pulvermasse-Soll-lst-Vergleichssignal berechnet und dieses als Pulvermasse-Signal (m1, m2, usw.) auf der Pulvermasse-Diagrammachse benutzt zur Berechnung des bei einer vorgegebenen Gesamtluftrate (GV1, GV2 usw.) erforderlichen Förderluftrate-Sollwertes und dann daraus zur Berechnung des zugehörigen Zusatzluftrate-Sollwertes, und wobei der auf der Pulvermasse-Diagrammachse für die Berechnung ausgewählte Wert der Pulvermasse (m1, m2 usw.) nur dann gleich groß wie der am Eingang (52) eingegebene Pulverrate-Sollwert (m-Soll) ist, wenn der Pulvermassenstrom-lstwert (m-lst) gleich dem Pulverrate-Sollwert (m-Soll) ist;daß der Förderluftregler (32; 32, 132) die Förderluft in Abhängigkeit vom Fdrderluftrate-Soll. wert (FV-Soll; FP-Soll) und in Abhängigkeit von einem Förderluftrate-Istwert (FV-Ist; (FV-Ist, FP-Ist) regelt, welcher von einem Förderluftrate-Istwert-Sensor (38; 38, 138) erzeugt wird;daß der Zusatzluftregler (34; 34, 134) die Zusatzluftrate in Abhängigkeit vom Zusatzluftrate-Sollwert (ZV-Soll; ZV-Soll, ZP-Soll) und in Abhängigkeit eines von einem Zusatzluftrate-Istwert (ZV-Ist; ZV-Ist, ZP-Ist) regelt, welcher von einem Zusatzluftrate-Istwert-Sensor (44; 44, 144) erzeugt wird. - Pulverfördervorrichtung nach Anspruch 1,
dadurch gekennzeichnet, daß die gewünschte Gesamtluftrate im Diagramm (50) des Computers (24) als eine gerade oder gekrümmte Linie (GV) gespeichert ist, über welche für jede gespeicherte Pulverförderrate (m) die bei dieser vorbestimmten Gesamtluftrate erforderliche Förderluftrate (FV) aus dem Diagramm entnommen werden kann. - Pulverfördervorrichtung nach Anspruch 2,
dadurch gekennzeichnet, daß für mehrere vorbestimmte Gesamtluftraten (GV1, GV2) Diagrammlinien im Diagramm (50) des Computers (24) gespeichert sind, über welche der Computer für eine ausgewählte Pulverförderrate (z.B. m1 oder m2) und eine gewählte Gesamtluftrate (z.B. GV1 oder GV2) die dazu erforderliche Förderluftrate (z.B. FV1 oder FV2) berechnet, dann durch die Differenz zwischen Gesamtluftrate und Förderluftrate die gegebenenfalls erforderliche Zusatzluftrate errechnet, und in Abhängigkeit von diesen Berechnungen einen Förderluftrate-Sollwert (FV-Soll; FV-Soll, FP-Soll) und einen Zusatzluftrate-Sollwert (ZV-Soll; ZV-Soll, ZP-Soll) erzeugt, und daß der Computer (24) einen Eingang (52) zur Einstellung eines gewünschten Pulvermasse-Sollwertes (m-Soll) und einen Eingang (54) zur Einstellung eines gewünschten Gesamtluftraten-Sollwertes (GV-Soll) aufweist. - Pulverfördervorrichtung nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, daß der Förderluftregler (32) ein Volumenstromregler ist welcher das pro Zeiteinheit geförderte Förderluftvolumen regelt. - Pulverfördervorrichtung nach Anspruch 4,
dadurch gekennzeichnet, daß ein Förderluft-Druckregler (132) vorgesehen ist, welcher elektrische Förderluft-Druck-Sollwerte erhält, die vom Förderluft-Volumenstromregler (32) in der Weise erzeugt werden, daß sie von ihm erzeugten Förderluftvolumenstrom-Sollwerten entsprechen, und daß der Förderluft-Druckregler (132) in Abhängigkeit von diesen Förderluftdruck-Sollwerten (FP-Soll) den Druck regelt, mit welchem die Förderluft zum Injektor (2) gefördert wird. - Pulverfördervorrichtung nach Anspruch 5,
dadurch gekennzeichnet, daß der Förderluft-Volumenstromregler (32) durch die Hardware oder Software des Computers (24) gebildet ist. - Pulverfördervorrichtung nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, daß der Zusatzluft-Regler ein Zusatzluft-Volumenstromregler (34) ist, welcher das pro Zeiteinheit geförderte Zusatzluftvolumen regelt. - Pulverfördervorrichtung nach Anspruch 7,
dadurch gekennzeichnet, daß ein Zusatzluft-Druck-Regler (134) vorgesehen ist, welchem elektrische Zusatzluftdruck-Sollwerte (ZP-Soll) zugeführt werden, welche vom Zusatzluft-Volumenstromregler (34) derart erzeugt werden, daß sie von ihm erzeugten Zusatzluft-Volumenstrom-Sollwerten entsprechen, und daß der Zusatzluft-Druckregler (134) in Abhängigkeit von diesen Zusatzluftdruck-Sollwerten den Druck regelt, mit welchem die Zusatzluft dem Pulver-Luft-Strom im Injektor oder stromabwärts von ihm hinzugefügt wird. - Pulverfördervorrichtung nach Anspruch 8,
dadurch gekennzeichnet, daß der Zusatzluft-Volumenstromregler (34) durch die Hardware oder Software des Computers (24) gebildet ist. - Pulverfördervorrichtung nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, daß der Computer (24) an eine zentrale Steueranlage (200) angeschlossen ist, von welcher er die Sollwerte für das Pulver und für die Gesamtluftmenge bestehend aus Förderluft und gegebenenfalls hinzugefügter Zusatzluft erhält. - Pulverfördervorrichtung nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, daß ein Pulvermasse-Istwertsensor (56) vorgesehen ist, welcher in Abhängigkeit von der im Pulver-Luft-Strom vorhandenen Pulvermassenrate ein elektrisches Pulvermasse-lstwert-Signal (m-lst) erzeugt, daß ein dem Pulvermasse-Istwert-Signal (m-lst) entsprechendes Signal dem Computer zugeführt wird, daß der Computer (24) derart programmiert ist, daß er aus dem Pulvermasse-Istwert-Signal (m-lst) und dem Pulvermasse-Sollwert (m-Soll) ein Pulvermasse-Soll-lst-Vergleichssignal als Pulvermasse-Signal (m1, m2) auf der Pulverförderraten-Diagrammachse (m) zur Berechnung der Förderluftrate (FV1, FV2) auf der Förderluftraten-Diagrammachse (FV) verwendet.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4325044A DE4325044C2 (de) | 1993-07-26 | 1993-07-26 | Pulverfördervorrichtung, insbesondere für Beschichtungspulver |
DE4325044 | 1993-07-26 |
Publications (4)
Publication Number | Publication Date |
---|---|
EP0636420A2 EP0636420A2 (de) | 1995-02-01 |
EP0636420A3 EP0636420A3 (de) | 1995-09-13 |
EP0636420B1 EP0636420B1 (de) | 1998-10-28 |
EP0636420B2 true EP0636420B2 (de) | 2002-01-02 |
Family
ID=6493732
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP94108909A Expired - Lifetime EP0636420B2 (de) | 1993-07-26 | 1994-06-10 | Pulverfördervorrichtung, insbesondere für Beschichtungspulver |
Country Status (4)
Country | Link |
---|---|
US (1) | US5702209A (de) |
EP (1) | EP0636420B2 (de) |
DE (2) | DE4325044C2 (de) |
ES (1) | ES2123077T5 (de) |
Families Citing this family (33)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE59610361D1 (de) * | 1995-09-18 | 2003-05-28 | Elpatronic Ag Bergdietikon | Verfahren zur Förderung eines pulverförmigen Gutes mittels eines Injectors |
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- 1994-06-10 DE DE59407168T patent/DE59407168D1/de not_active Expired - Fee Related
- 1994-06-10 ES ES94108909T patent/ES2123077T5/es not_active Expired - Lifetime
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Also Published As
Publication number | Publication date |
---|---|
ES2123077T5 (es) | 2002-07-16 |
DE59407168D1 (de) | 1998-12-03 |
EP0636420A3 (de) | 1995-09-13 |
DE4325044C2 (de) | 2002-07-18 |
EP0636420B1 (de) | 1998-10-28 |
DE4325044A1 (de) | 1995-02-02 |
US5702209A (en) | 1997-12-30 |
EP0636420A2 (de) | 1995-02-01 |
ES2123077T3 (es) | 1999-01-01 |
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