EP1844859A1 - Vorrichtung zur Dosierung und Zuführung eines pulverförmiges Materials - Google Patents

Vorrichtung zur Dosierung und Zuführung eines pulverförmiges Materials Download PDF

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Publication number
EP1844859A1
EP1844859A1 EP06356044A EP06356044A EP1844859A1 EP 1844859 A1 EP1844859 A1 EP 1844859A1 EP 06356044 A EP06356044 A EP 06356044A EP 06356044 A EP06356044 A EP 06356044A EP 1844859 A1 EP1844859 A1 EP 1844859A1
Authority
EP
European Patent Office
Prior art keywords
product
gas
volume
fluidized
tube
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP06356044A
Other languages
English (en)
French (fr)
Other versions
EP1844859B1 (de
Inventor
Patrick Ballu
Christophe Pravert
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sames Kremlin SAS
Original Assignee
Sames Technologies SAS
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
Priority to FR0410655A priority Critical patent/FR2876303B1/fr
Application filed by Sames Technologies SAS filed Critical Sames Technologies SAS
Priority to US11/401,467 priority patent/US8292197B2/en
Priority to DE200660014933 priority patent/DE602006014933D1/de
Priority to AT06356044T priority patent/ATE471215T1/de
Priority to EP06356044A priority patent/EP1844859B1/de
Publication of EP1844859A1 publication Critical patent/EP1844859A1/de
Application granted granted Critical
Publication of EP1844859B1 publication Critical patent/EP1844859B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • 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
    • 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
    • B05B7/1463—Arrangements for supplying particulate material the means for supplying particulate material comprising a gas inlet for pressurising or avoiding depressurisation of a powder container
    • 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
    • B05B7/1472—Powder extracted from a powder container in a direction substantially opposite to gravity by a suction device dipped into the powder
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B13/00—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00
    • B05B13/02—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work
    • B05B13/04—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work the spray heads being moved during spraying operation
    • B05B13/0431—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work the spray heads being moved during spraying operation with spray heads moved by robots or articulated arms, e.g. for applying liquid or other fluent material to 3D-surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • 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
    • B05B7/144—Arrangements for supplying particulate material the means for supplying particulate material comprising moving mechanical means
    • B05B7/1445—Arrangements for supplying particulate material the means for supplying particulate material comprising moving mechanical means involving vibrations

Definitions

  • the invention relates to a device for dosing and continuous transport of powdery product as well as to a use of such a device and to a coating product spraying installation comprising such a device.
  • a pressure pot as described in FR-A-1,279,167 can be used to transport a powdered product continuously, with a high flow rate and over long distances, without using a Venturi system with rapid wear.
  • no control of the product flow can be carried out, this flow rate evolving during the emptying of the pot because it is difficult to control both the air flow required to fluidize the product and the pressure internal of the pot. It is also difficult to keep the coating product in the fluidized state waiting for use without initiating the pressurizing of the pot and the delivery of the product.
  • the dip tube and the conduits to which it is connected must have a relatively large diameter when it is desired to transport the product over a long distance, of the order of several meters, and with a high flow rate, in order to limit the pressure drops to the flow.
  • EP-A-1,454,675 It is also known from EP-A-1,454,675 to use a pressure pot to feed a projector fluidized powder coating product in the form of dense.
  • the product flow supplied to the projector can be controlled by establishing and controlling the pressure in the pot using, for example, an air vent.
  • An independent air injection device is provided to stop the flow of the air / powder mixture and clean the supply duct of the projector when necessary.
  • This kind of material and the transport method in dense form do not allow to power a projector over a long distance and are incompatible with successive stops and restarts of the power supply.
  • the invention relates to a device for metering and conveying powder product continuously from a closed reservoir, this device comprising means for fluidizing at least part of the product in this reservoir, a dip tube in the fluidized product and opening out of the tank, and means for pressurizing the reservoir.
  • This device is characterized in that it comprises means for permanently feeding the pressurizing gas from the reservoir to a mixing chamber of this gas with the fluidized product leaving the dip tube, this gas supply means being equipped or constituting a restriction on the flow of gas, while a pipe for transporting the powdery product mixed with the gas is connected downstream of the mixing chamber.
  • the pressure drop induced by the restriction on the path of the pressurizing gas to the mixing chamber makes it possible to establish a pressure difference between the pressure prevailing in the internal volume of the reservoir and the pressure prevailing in the mixing chamber.
  • This pressure difference is in fact applied on both sides of the dip tube, so that it determines the flow of fluidized product in this tube when the density of this product is controlled in the zone where the dip tube is in contact. contact with the product.
  • the determination and, possibly, the control of the pressure drop obtained by the pressurizing gas supplying means make it possible to control the flow of fluidized product into the dip tube, when the density of the product is mastered.
  • Rejecting the pressurizing gas to the mixing chamber at the outlet of the dip tube makes it possible to dilute the fluidized product as desired by adjusting the flow of pressurizing gas and / or the restriction. Dilution of the product through this addition of gas facilitates its continuous transport with a large flow and over significant distances.
  • the invention also relates to a particular use of the device mentioned above and more specifically, its use for supplying a projector with a coating product.
  • the invention also relates to a powder coating product projection installation which comprises at least one coating product projector and at least one device as mentioned above, this device supplying the projector coating product.
  • a powder coating product projection installation which comprises at least one coating product projector and at least one device as mentioned above, this device supplying the projector coating product.
  • the installation I shown in FIG. 1 is intended for the electrostatic coating of objects O displaced by a conveyor 1 in a direction perpendicular to the plane of FIG. 1.
  • the objects O pass in front of an electrostatic projector 2 of powder coating product connected to a high-voltage unit 3 and supplied with coating material from a pressurized pot 4 held in place by means of a support 5.
  • the projector 2 is connected to the unit 3 by means of a high-voltage cable 6, while it is connected to the pot 4 by means of a flexible hose 7.
  • the projector 2 is mounted on an arm 8 extending through a window 9 formed in a partition 10 of a coating cabin C.
  • the arm 8 is vertically movable, as represented by the double arrow F 1 , and supported by a mast 11 extending vertically from a base 12 of a reciprocator 13.
  • a cloud of powder coating material is directed from the projector 2 towards the objects O along the electrostatic field lines.
  • the projector may not be electrostatic, in which case the path of the powder constituting the coating product is determined essentially by aeraulic and gravitational forces.
  • the pressurized pot 4 comprises a bottom 101 and a cover 102 between which a cylindrical wall with a circular base 103 is arranged.
  • the pot 104 constitutes a sealed reservoir vis-à-vis the outside.
  • the bottom 101 is equipped with a porous plate 104 disposed above a distribution chamber 105 supplied with air under controlled pressure or with a controlled flow, by means of a conduit 106 formed in the bottom 101 and opening towards the outside by a connector 107 which is connected to a conduit C 1 fed from a regulated source S 1 of pressurized air.
  • a platen 108 fixed to the bottom 101 supports a vibrator 109 for transmitting vibrations to the entire pot 4 and thus agitating the fluidized mixture, to facilitate its fluidization and to avoid the formation of preferential flows or d agglomerates within the powdery product.
  • the air flows through the plate 104 as represented by the arrows F 2 , which has the effect of fluidizing the amount of powder coating product present in the interior volume V 4 of the pot 4 and to create a bed L 4 of fluidized coating product which extends above of the plate 103 on a height H 4 which depends both on the amount of the coating product present in the volume V 4 , the pressure and the feed rate of the chamber 105.
  • a dip tube 110 extends downwardly from the lid 102 to the vicinity of the plate 104.
  • This tube has an inner diameter d 110 relatively narrow and passes through the cover 102 being disposed in a sleeve 111 which protrudes toward the top from the cover 102 and on which is disposed a nozzle 112 which is connected to the pipe 7.
  • 110A is the lower end of the tube 110 and 110B its upper end.
  • the upper part of the tube 110 is disposed in a central bore 113 of the sleeve 111 which is cylindrical and circularly based and whose inside diameter d 113 is strictly greater than the outside diameter D 110 of the tube 10.
  • a ring 114 is provided around the tube 110 and engaged in the bore 113.
  • the sleeve 111 is provided with a second bore 115 aligned on an axis ZZ 'common to the elements 110, 113 and 114 and having a diameter d 115 greater than the diameter 113 .
  • a liner 116 is disposed in the bore 115 and its inner diameter d 116 is greater than the diameter D 110 of the tube 110.
  • a second duct C 2 connects a source S 2 of pressurized air to the part W 4 of the volume V 4 which is not occupied by the bed L 4 of fluidized coating product, that is to say the portion which extends between the upper surface of the bed L 4 and the inner face of the cover 102, over a height H ' 4 .
  • a pressure P 4 prevails in this part W 4 of the volume V 4 , which has the effect of exerting on the upper surface of the bed L 4 an effort which has tendency to drive some of the coating product inward from the end 110A of the tube 110.
  • a third duct C 3 connects the source S to a sewing 117 formed in the sleeve 111 in a direction generally radial to the axis ZZ 'and opening into the bore 113, at a distance from the end 110B.
  • the conduit C 3 is provided with an adjustable restriction R 3 which makes it possible to create a pressure drop ⁇ P between the upstream end and the downstream end of the conduit C 3 .
  • the first flow is that of the air coming from the conduit C 3 through the restriction R 3 .
  • the second flow is that of the mixture of powdery product and fluidizing air rising in the tube 110.
  • the volume V 6 constitutes a chamber in which the flow E 1 of fluidized coating product coming from the bed L 4 and the flow E 2 of gas arriving via the pipe C 3 are mixed.
  • the pressure difference between the inlet and the outlet of the tube 110 is equal to the pressure difference created by the restriction R 3, to which is added a factor dependent on the height of the fluidized bed L 4 , which factor can be determined by the calculation.
  • control of the pressure difference ⁇ P 110 makes it possible to control the mass flow rate of fluidized powdery product in the tube 110 since this flow rate is a univocal function of this pressure difference ⁇ P 110 , the characteristics of the powdered pulverized product as well as the characteristics The control of the mass flow rate of pulverulent products is therefore all the easier as the term ⁇ P allowing to define ⁇ P 110 is preponderant in front of the term pgh4, which makes it possible to overcome any variations in height H. 4 .
  • the volume V 6 constitutes a mixing chamber of the flow E 1 of fluidized powder product and the flow E 2 of the air coming from the pipe C 3 , the fluidized coating product being itself a mixture of the powdery product. and fluidizing air from chamber 105.
  • the flow E 2 opens out around this end while being centered on the axis of the tube 110, which induces a regulation effect of the flow rate of the product mixture. coating and air and avoids jerks in the flow downstream of the 110B end.
  • a second stitching 118 is optionally provided in the sleeve 111 and also opens into the bore 113.
  • This second stitching is connected by a conduit C 4 to a source S 3 of pressurized air and makes it possible to near the end 110B of the tube 110 of the additional dilution air of the air / powder mixture created in the chamber V 6 .
  • the taps 117 and 118 are arranged upstream of the downstream end 110B of the tube 110, which prevents the return of untimely products to the ducts C 3 and C 4 and prevents clogging.
  • the liner 116 is interchangeable and that its internal diameter d 116 is chosen as a function of the inside diameter d 7 of the pipe 7.
  • the diameter d 116 is preferably chosen to be substantially equal to the inside diameter d 7 of the pipe 7 .
  • the bore 113 and / or the jacket 1216 may be cylindrical with a straight generatrix or provided on their internal face with a thread or a helical relief intended to improve the mixing of the air and the product by rotating stirring or vortex effect. Such a net is partially shown in phantom in FIG. reference 116a, on the inner face of the liner 116. In a variant, such a thread may be provided in the bore 113, upstream of the end 110B, which makes it possible to obtain a Vortex effect on the flow E 2 .
  • the length L 116 of the liner 116 which is equal to the length of the mixing chamber V 6 , is chosen at least three times greater than the diameter d 116 , preferably equal to about ten times this diameter, which allows a good homogenization of the air / powder mixture coming from the tube 110 and the air coming from the bore 113.
  • the ratio L 116 / d 116 may be chosen equal to about five .
  • the invention makes it possible to convey, to a large distance, a continuous mixture of air and coating product, with a large and controlled flow rate, while the tube 110 and the pipe 7 have small diameters and that the pipe 7 is relatively long and liable to deform depending on the movements of the arm 8.
  • the pressure pot 204 of this embodiment is equipped with a tube plunger 310 which extends from a cover 302 into a bed L 4 fluidized coating product through a device 303 supplied with fluidization air through a conduit C 1 connected to a source S 1 of pressurized air .
  • a vibrator 309 is mounted on the bottom 301 of the pot 204.
  • the volume W 4 of the pot 204 which is not occupied by the bed L 4 of fluidized coating product is supplied with pressurized air from a conduit C 2 connected to a second source S 2 of pressurized air.
  • a mixing chamber V 6 is disposed above the pot 204, the downstream end 310B of the tube 310 opening into this chamber.
  • a duct C 3 provided with an adjustable restriction R 3 connects, through the lid 302, the volume W 4 and the mixing chamber V 6 , which makes it possible, as previously to control the flow rate of the product mixture of coating / gas of fluidization flowing in the conduit 310 by means of the pressure drop created by the restriction R 3 in the conduit C 3 .
  • a vent 318 is mounted on the cover 302 and makes it possible to vent the volume W 4 , in particular when the apparatus to which the pot 204 is connected by a flexible duct 207 is not in operation or before its manual filling in. coating product.
  • the pressure pot 404 of this embodiment is equipped with a porous plate 503 supplied with pressurized air, from a source S 1 , via a conduit C 1 which opens into a distribution chamber 505.
  • a pipe 407 connects the pot 404 to a product use station which is not shown.
  • E 1 is the flow of the product mixture / dilution air in the conduit 510.
  • annular duct C 3 is formed around the upper part 510B of a tube 510 immersed in the bed L 4 and opening inside a sleeve 513.
  • the duct C 3 is created by the difference between the outside diameter of the tube 510 and the inside diameter of the sleeve 513.
  • This duct C 3 has an annular section of relatively small area with respect to its length L 3 , so that it creates in it even a restriction on the flow E 2 of the pressurizing air, between the volume W 4 and a mixing chamber V 6 formed in the sleeve 513, downstream of the tube 510.
  • the restriction R 3 of the conduit C 3 induces a pressure drop of the same kind as that resulting from the restrictions R 3 of the first and second embodiments.
  • the pressure P 6 in the chamber V 6 is less than the pressure P 4 in the upper part of the pot 404 by a value determined, inter alia, by the geometry of the duct C 3 and by the flow rate of gas flowing through this duct .
  • the control of the flow rate of gas flowing through the conduit C 3 makes it possible to control the flow rate of the flow E 1 of the fluidized mixture circulating in the conduit 510.
  • This flow rate of gas flowing through the conduit C 3 depends in fact on the flow of fluidization gas conveyed by the conduit C 1 and the flow rate of pressurizing gas tank 404 conveyed by the conduit C 2 .
  • the flow rate of the fluidization gas is kept constant, a substantially constant fluidized product density is obtained and the only parameters to be controlled to control the flow of product in the product 510 are then the pressure and / or the gas flow rate. pressurizing the reservoir through the conduit C 2 .
  • the restriction formed by the conduit C 3 can be designed in such a way that the flow rate of the fluidization gas is not sufficient to generate, on its own, a flow rate within the led 510, which allows to constantly maintain the bed L 4 of fluidized products without delivering products in the conduit 110 while the powder product remains available at any time by "pumping" when necessary.
  • the section of the duct C 3 or of its inlet zone can be adjustable, which makes it possible to modulate the air flow in this duct and, thus, the pressure drop and the flow in the tube 510.
  • the conduit C 3 is replaced by a restriction R 3 in the form of a ring around a portion of the dip tube 510.
  • This restriction alone is sufficient to create a pressure drop on the flow E 2 of air resulting from the difference between the pressure P 4 in the volume W 4 of the pressure vessel and the pressure P 6 in a mixing chamber V 6 formed in a sleeve 513, in a manner analogous to that of the third embodiment.
  • the restriction R 3 can be calibrated or adjustable.
  • the pressure pot 4 of the embodiment of Figure 8 has a wall 103 converging downwards and its bottom 101 is open facing a porous plate 104 for fluidizing the coating product in the pressure pot.
  • the porous plate is fed from a source S 1 of pressurized air whereas a source S 2 of pressurized air makes it possible to feed the volume W 4 of the pot 4 which is not occupied by the product fluidized.
  • a restriction R 3 is provided on a conduit C 3 which opens in the vicinity of the upper end 110B of a plunger tube 110, the air coming from the conduit C 3 mixing with the fluidized product mixture coming from the tube 110 in a mixing chamber whose interior volume is V 6 .
  • the tank 4 is equipped with a vibrator 109 and a scale 150 for continuously determining the weight of product contained in the tank.
  • This scale sends a signal ⁇ 1 to a control unit U of the installation in which the tank 4 is integrated. It is thus possible to monitor the consumption of a powered projector from the tank 4 by comparing the weight of the product at the beginning and at the end of the application. It is also possible to monitor the product flow consumed by the projector by integrating, over a longer or shorter period of time, the variations in product weight detected by the scale.
  • a cylindrical partition 160 is held inside the tank 4 by unrepresented lugs bearing on the wall 103.
  • This partition 160 is cylindrical, circular base and centered on the tube 110. It defines, in the interior volume V 4 of the tank 4, two unit volumes, namely a volume V 160 , in the form of a column defined inside the partition 160, and a volume W 160 , located around the partition 160 inside the tank.
  • the plate 104 is disk-shaped with a radius close to the inside radius of the partition 160.
  • the lower edge 160A of the partition 160 is also disposed at a height h 160 which is not zero relative to the bottom 101.
  • the fluidizing air flowing through the plate 104 makes it possible to create a bed L 4 of fluidized product in the volume V 160 , this bed L 4 being permanently supplied with coating product stored in unpowdered form in the volume W 160 and flowing by gravity towards the center of the plate 104.
  • the flow of the product fluidizing coating, the volume W 160 to the volume V 160 is represented by the arrows F 16 .
  • the air flow through the plate 104 is adjusted so that the bed L 4 extends to the upper edge 160B of the partition 160 and overflows therefrom, a portion of the coating product being discharged by gravity to the volume W 160 , as represented by the arrows F 17 .
  • the height h 4 of the fluidized bed L 4 above the lower end 110A of the tube 110 is constant insofar as the height H 4 of the fluidized bed is itself constant. This avoids fluctuations in the amount of the coating product directed to the mouth 110A of the tube 110.
  • the partition 160 makes it possible to maintain in the tank 4 a column L 4 of fluidized product of height H 4 which is constant or almost constant, despite the consumption of product and despite the fact that the reservoir is not re-heated. powered during an application.
  • the volume W 160 constitutes, within the tank 4, a product reserve area to be fluidized which makes it possible to compensate for the consumption of the product.
  • a vibrator 109 is mounted at the bottom of the tank 4.
  • FIG. 9 is close to that of FIG. 8.
  • the same references are used to designate the same elements and only the differences with respect to the embodiment of FIG. 8 are explained here.
  • the porous plate 104 of the tank 4 has an area greater than the section of the interior volume of the partition 160, which fluidizes the coating product both in the volume V 160 and partially in the volume W 160 . This facilitates the feeding of the volume V 160 to the fluidizing coating product in the direction of the arrows F 16 . This makes it possible to dispense with the use of the vibrator 109 of the embodiment of FIG. 8.
  • Other means may be provided for maintaining a predetermined height of fluidized coating product over the mouth 110A of the tube 110.
  • manual or automatic adjustment means may be provided for adjusting the position of the tube 110 with respect to the lid of the pressurized pot so that the lower end 110A is depressed by a substantially constant height h 4 in the fluidized bed L 4 . It is also possible to maintain the total height H 4 of the bed of fluidized product L 4 by keeping the overall quantity of fluidized coating product contained in the tank substantially constant, by supplying the tank continuously or almost continuously.
  • a scale may also be used with the reservoir of the embodiment of Figure 9, as with those of the embodiments of Figures 1 to 7.
  • a scale such as scale 150 makes it possible to use the information relating to the weight of the product present in the reservoir to estimate the fluidized product height and to ensure the filling of the reservoir to a maximum height of fluidized product which corresponds, in practice, to a maximum product weight that can hold the reservoir.
  • Such a scale also makes it possible to estimate in real time the evolution of the fluidized product height in order to perform, if necessary, an automatic correction of the flow rate supplied by the device to the projector that it supplies. This makes it possible to compensate for any drift in the flow rate resulting from the fluidised product height variation that may occur in the devices of the first four embodiments in the absence of a partition of the type of the partition 160.
  • the invention has been described during its implementation in a coating product installation and for the transport of agri-food product. It is however not limited to these applications, even if the application in the field of installations of the coating product is very advantageous.
  • the invention can be used in the pharmaceutical field, for the transport of drugs in pulverulent form or in the agricultural field for the transport of herbicide, fungicide or fertilizer in powder form.
  • the nature of the fluidizing gas and the pressurizing gas can be adapted.
  • the restrictions R 3 have been represented as variables. However, it is possible to predict that these restrictions are calibrated. Control of the total flow of gas entering the tank and gas passing through the restriction then controls the flow of powdered product taken from the tank. These restrictions may, where appropriate, be the subject of a standard exchange depending on the characteristics of the product to be transported and the characteristics of the installation downstream of the mixing chamber.
  • the restrictions of the third and fourth embodiments may be adjustable.
  • the restriction in the gas supply duct to the mixing chamber or constituting this duct may be adjustable or calibrated.
  • a calibrated restriction makes it possible to easily control the flow of powdery product since the control of the flow rate and / or the pressurization gas pressure of the reservoir is relatively easy, for example with a solenoid valve.
  • the restriction has a simple shape, devoid of a retention zone because the gas passing through such a restriction can be slightly loaded with particles of coating product, especially in the case of the installation of FIG.
  • the flow rate of the fluidization gas is negligible compared to the flow rate of the pressurizing gas of the reservoir, so as to enable the control to be separated from the powder product flow, on the one hand, and the fluidization, on the other hand.
  • This makes it possible, in particular, to keep the coating product in the form of a fluidized bed waiting to be pumped into the tank, without the airflow necessary for this fluidization being sufficient to create a pressure drop across the restriction. and generating a pumping of the product.
  • the invention has been shown with certain materials in which all the powdery product is fluidized. It also applies to the case where only a part of this product is fluidized.
  • a system known per se, for supplying the reservoir with powdery product.
  • the supply of the tank with such a system can be continuous or sequential. In a simple case, the tank lid is periodically removed and the product is discharged by an operator into the tank.
  • the invention has been described when it is used with separate air sources S 1 , S 2 and / or S 3 . These In practice, sources are fed from the same main network and pressure or flow control devices are interposed upstream of the sources S 1 , S 2 and / or S 3 to allow their independent management. Alternatively, two of these sources or three sources could be grouped together.
  • the pressurized pot 4 of this embodiment is used to feed a projector 2 of powder coating material, this projector being mounted on the movable arm 120 of a multi-axis robot.
  • this projector 2 could be mounted on any type of support, including the arm of a reciprocator.
  • the pressurized pot 4 has a cylindrical wall 103 and its internal volume is separated by a porous plate 104 into a distribution chamber 105 and a volume of production of a fluidized bed L 4 of powder coating product.
  • the chamber 105 is supplied with air under controlled pressure from a source S 1 of compressed air, this compressed air passing through the plate 104, as represented by the arrows F 2 , to fluidize the bed L 4 .
  • a tube 110 dips into the fluidized bed L 4 and allows to extract a portion of the product, as explained above.
  • the tube 110 is connected, in the upper part, to a hose 117 which extends from the upper end 110B of the tube 110 to a volume V 6 defined inside the arm 120 and in which the powdery product in dense phase passing through the tubes 110 and 117 may be mixed with additional air.
  • the volume V 6 is fed through a conduit C 3 of relatively small diameter. from a conduit C 2 connected to a second source of pressure S 2 .
  • the duct C 2 is also connected to the internal volume V 4 of the pot 4 situated above the fluidized bed L 4 by a duct section C ' 3 .
  • the coating product mixed with air flows in a pipe 7 for supplying the projector 2.
  • the length of the pipe 117 may be of the order of 6 to 8 m, while the length of the pipe 7 is greater than 10 cm and less than 2 m. However, the length of the pipe 7 could be increased to 50% of the total length of the flow path between the pot 3 and the designer 2.
  • the pipe C 3 constitutes a means for permanently supplying pressurizing gas from the source S 2 into the mixing chamber formed by the volume V 6 . Given its length and its diameter, which is in practice less than 5 mm, the conduit C 3 induces a pressure drop on the flow of air from the source S 2 , this pressure loss resulting from the restriction. constituted by the conduit C 3 .
  • conduit C 3 could also be equipped with a variable restriction such as that R 3 mentioned with reference to the embodiments of Figures 4, 8 and 9.
  • the seventh embodiment corresponds to a case where the coating product is transported in dense phase over a relatively long length, namely the length of the pipe 117, and in diluted phase over a relatively long length. low, namely the length of the pipe 7.
  • the principle used in this embodiment is close to that of the first embodiment.

Landscapes

  • Coating Apparatus (AREA)
  • Nozzles (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Glanulating (AREA)
  • Control And Other Processes For Unpacking Of Materials (AREA)
EP06356044A 2004-10-08 2006-04-11 Vorrichtung zur Dosierung und Zuführung eines pulverförmiges Materials Not-in-force EP1844859B1 (de)

Priority Applications (5)

Application Number Priority Date Filing Date Title
FR0410655A FR2876303B1 (fr) 2004-10-08 2004-10-08 Dispositif de dosage et de transport en continu de produit pulverulent, utilisation d'un tel dispositif et installation de projection de produit de projection comprenant un tel dispositif
US11/401,467 US8292197B2 (en) 2004-10-08 2006-04-11 Device for continuously metering and transporting a powder, the use of the device, and a coating powder sprayer installation including the system
DE200660014933 DE602006014933D1 (de) 2006-04-11 2006-04-11 Vorrichtung zur Dosierung und Zuführung eines pulverförmiges Materials
AT06356044T ATE471215T1 (de) 2004-10-08 2006-04-11 Vorrichtung zur dosierung und zuführung eines pulverförmiges materials
EP06356044A EP1844859B1 (de) 2004-10-08 2006-04-11 Vorrichtung zur Dosierung und Zuführung eines pulverförmiges Materials

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0410655A FR2876303B1 (fr) 2004-10-08 2004-10-08 Dispositif de dosage et de transport en continu de produit pulverulent, utilisation d'un tel dispositif et installation de projection de produit de projection comprenant un tel dispositif
US11/401,467 US8292197B2 (en) 2004-10-08 2006-04-11 Device for continuously metering and transporting a powder, the use of the device, and a coating powder sprayer installation including the system
EP06356044A EP1844859B1 (de) 2004-10-08 2006-04-11 Vorrichtung zur Dosierung und Zuführung eines pulverförmiges Materials

Publications (2)

Publication Number Publication Date
EP1844859A1 true EP1844859A1 (de) 2007-10-17
EP1844859B1 EP1844859B1 (de) 2010-06-16

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP06356044A Not-in-force EP1844859B1 (de) 2004-10-08 2006-04-11 Vorrichtung zur Dosierung und Zuführung eines pulverförmiges Materials

Country Status (4)

Country Link
US (1) US8292197B2 (de)
EP (1) EP1844859B1 (de)
AT (1) ATE471215T1 (de)
FR (1) FR2876303B1 (de)

Families Citing this family (10)

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Publication number Priority date Publication date Assignee Title
DE102006032184B4 (de) * 2006-07-12 2010-06-17 Eisenmann Anlagenbau Gmbh & Co. Kg Vorrichtung zum Fördern pulverförmiger fluidisierter Medien
US20080205189A1 (en) * 2007-02-27 2008-08-28 Illinois Tool Works Inc. Dense phase pump for pulverulent material
WO2010077936A1 (en) * 2008-12-17 2010-07-08 Nordson Corporation Powder hopper with quiet zone, a combination of a powder hopper and a powder spray gun and a method of operating a powder hopper
US8881997B2 (en) * 2010-10-19 2014-11-11 West Virginia University Nanoparticle aerosol generator
FR3004767B1 (fr) * 2013-04-17 2015-05-15 Sames Technologies Pompe a effet venturi et installation d'application de revetement de peinture
US10226786B2 (en) 2013-08-15 2019-03-12 Gema Switzerland Gmbh Powder pipe coating booth
US20150084282A1 (en) * 2013-09-25 2015-03-26 Hogsback Designs, Inc Systems and methods for pneumatically actuated displays for colored powder
CN105054265A (zh) * 2015-09-08 2015-11-18 浙江大学 一种水产品静电裹粉装置及其方法
US11022987B2 (en) * 2017-07-21 2021-06-01 Carlisle Fluid Technologies, Inc. Systems and methods for improved control of impingement mixing
US11638959B2 (en) 2020-09-03 2023-05-02 General Electric Company Systems and methods for estimating powder dosing in additive manufacturing processes

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EP0297463A1 (de) * 1987-07-01 1989-01-04 The Perkin-Elmer Corporation Vorrichtung zur Zuführung von pulverförmigem Material mit einem Durchflussregler für einen geschlossenen Pulverkeislauf und entsprechendes Verfahren
EP0864849A1 (de) * 1996-09-24 1998-09-16 Rid Corporation Pulvermassendurchflussmesser und pulverbeschichtungsvorrichtung damit
WO2001058598A1 (en) * 2000-01-28 2001-08-16 Church & Dwight Co Inc Device for generating a pressurized stream of treating media

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US3134513A (en) * 1960-09-30 1964-05-26 Dust Control Processes Ltd Insufflator
FR1279167A (fr) * 1961-02-09 1961-12-15 Inst Nat De L Ind Charbonniere Appareillage pour l'élévation pneumatique de produits solides granulés
US3711022A (en) * 1969-10-20 1973-01-16 Glick L Electrostatic coating apparatus
US4660772A (en) * 1984-09-26 1987-04-28 A. O. Smith Corporation Electrostatic powder spray gun nozzle
US4586854A (en) * 1985-06-12 1986-05-06 Nordson Corporation Venturi powder pump having rotating diffuser
US4953792A (en) * 1989-02-10 1990-09-04 Roussel Bio Corporation Dry powder applicator
CA2254269A1 (en) * 1997-12-30 1999-06-30 Patrick P. Chen Dry particulate dispersion system and flow control device therefor
US7273339B2 (en) * 2003-03-07 2007-09-25 Haden Schweitzer Corporation Powder transport method and apparatus

Patent Citations (3)

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Publication number Priority date Publication date Assignee Title
EP0297463A1 (de) * 1987-07-01 1989-01-04 The Perkin-Elmer Corporation Vorrichtung zur Zuführung von pulverförmigem Material mit einem Durchflussregler für einen geschlossenen Pulverkeislauf und entsprechendes Verfahren
EP0864849A1 (de) * 1996-09-24 1998-09-16 Rid Corporation Pulvermassendurchflussmesser und pulverbeschichtungsvorrichtung damit
WO2001058598A1 (en) * 2000-01-28 2001-08-16 Church & Dwight Co Inc Device for generating a pressurized stream of treating media

Also Published As

Publication number Publication date
US8292197B2 (en) 2012-10-23
FR2876303A1 (fr) 2006-04-14
US20070235558A1 (en) 2007-10-11
EP1844859B1 (de) 2010-06-16
ATE471215T1 (de) 2010-07-15
FR2876303B1 (fr) 2007-01-05

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