FR2552683A1 - Rotary head driven by a hydraulic motor at a high rotation speed for electrostatically spraying liquid products - Google Patents

Rotary head driven by a hydraulic motor at a high rotation speed for electrostatically spraying liquid products Download PDF

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Publication number
FR2552683A1
FR2552683A1 FR8315743A FR8315743A FR2552683A1 FR 2552683 A1 FR2552683 A1 FR 2552683A1 FR 8315743 A FR8315743 A FR 8315743A FR 8315743 A FR8315743 A FR 8315743A FR 2552683 A1 FR2552683 A1 FR 2552683A1
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FR
France
Prior art keywords
disc
hydraulic motor
liquid products
motor
spraying liquid
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
FR8315743A
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French (fr)
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FR2552683B1 (en
Inventor
Adrien Lacchia
Laurent Faure
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Sames SA
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Sames SA
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Publication date
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Priority to FR8315743A priority Critical patent/FR2552683B1/en
Publication of FR2552683A1 publication Critical patent/FR2552683A1/en
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Publication of FR2552683B1 publication Critical patent/FR2552683B1/en
Expired legal-status Critical Current

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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
    • B05B5/025—Discharge apparatus, e.g. electrostatic spray guns
    • B05B5/04—Discharge apparatus, e.g. electrostatic spray guns characterised by having rotary outlet or deflecting elements, i.e. spraying being also effected by centrifugal forces
    • B05B5/0415—Driving means; Parts thereof, e.g. turbine, shaft, bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/20507—Type of prime mover
    • F15B2211/20515—Electric motor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/27—Directional control by means of the pressure source
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/30505—Non-return valves, i.e. check valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/3056—Assemblies of multiple valves
    • F15B2211/30565—Assemblies of multiple valves having multiple valves for a single output member, e.g. for creating higher valve function by use of multiple valves like two 2/2-valves replacing a 5/3-valve
    • F15B2211/3058—Assemblies of multiple valves having multiple valves for a single output member, e.g. for creating higher valve function by use of multiple valves like two 2/2-valves replacing a 5/3-valve having additional valves for interconnecting the fluid chambers of a double-acting actuator, e.g. for regeneration mode or for floating mode
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/505—Pressure control characterised by the type of pressure control means
    • F15B2211/50509—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means
    • F15B2211/50518—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using pressure relief valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/515—Pressure control characterised by the connections of the pressure control means in the circuit
    • F15B2211/5159—Pressure control characterised by the connections of the pressure control means in the circuit being connected to an output member and a return line
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
    • F15B2211/7058—Rotary output members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/80—Other types of control related to particular problems or conditions
    • F15B2211/85—Control during special operating conditions
    • F15B2211/853—Control during special operating conditions during stopping
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/80—Other types of control related to particular problems or conditions
    • F15B2211/86—Control during or prevention of abnormal conditions
    • F15B2211/8609—Control during or prevention of abnormal conditions the abnormal condition being cavitation

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electrostatic Spraying Apparatus (AREA)

Abstract

Head having a high rotation speed, of the type having an electrostatic disc for spraying liquid products onto articles to be coated. The rotation of the disc is performed by a hydraulic motor. This system enables large-diameter discs to be driven at a high rotation speed.

Description

La présente invention concerne une tête rotative de type à disque, de pulvérisation électrostatique de produits liquides tels que peintures vernis et similaires, sur des objets à revêtir placés radialement autour de l'axe du disque. The present invention relates to a rotary head of the disc type, for electrostatic spraying of liquid products such as varnished paints and the like, on objects to be coated placed radially around the axis of the disc.

I1 existe, à l'heure actuelle, des appareils d'application électrostatique à tête atomisante du type à disque, dits à grande vitesse, entrainant habituellement des disques dont les diamètres varient entre 150 -mm et 250 mm à des vitesses de rotation comprises entre 5000 t/mn et 25000 tours/minute. I1, at present, electrostatic application devices with atomizing head of the disc type, called high speed, usually driving discs whose diameters vary between 150 mm and 250 mm at rotational speeds between 5000 rpm and 25000 rpm.

Le disque qui constitue l'organe de pulvérisation proprement dit est constitué d'une chambre annulaire dans laquelle aboutissent le ou les conduits d'amenée de la peinture. The disc which constitutes the actual spraying member consists of an annular chamber in which the paint supply line (s) terminate.

Cette chambre annulaire débouche sur une partie en forme de disque plat ou en forme de cône à angle au sommet important dont l'arête extérieure constitue la zone de pulvérisation.This annular chamber opens onto a part in the form of a flat disc or in the form of a cone with a large apex angle, the outer edge of which constitutes the spraying zone.

Le produit à pulvériser injecté dans la cavité annulaire forme un film fin de peinture qui tout en adhérant au disque sous l'effet des forces interfaciales, et éventuellement centrifuges dans le cas de disques coniques, chemine en direction de l'arête de pulvérisation sous l'effet de la force centrifuge. The product to be sprayed injected into the annular cavity forms a fine film of paint which, while adhering to the disc under the effect of interfacial forces, and possibly centrifugal in the case of conical discs, travels towards the spraying edge under the effect of centrifugal force.

Le disque est porté à un potentiel électrique généralement négatif et de l'ordre de 60 000 à 150 000 V. Les objets à revêtir, reliés à la masse, défilent suivant une trajectoire en Oméga autour du disque de pulvérisation. The disc is brought to a generally negative electrical potential and of the order of 60,000 to 150,000 V. The objects to be coated, connected to ground, pass along a trajectory in Omega around the spraying disc.

Suivant la vitesse de rotation et le diamètre du disque atomisant, la pulvérisation s'effectue soit en grande partie par voie électrostatique soit en grande partie sous l'effet de la force centrifuge et des forces de frottement dans l'air de l'extrémité du film de peinture. Depending on the speed of rotation and the diameter of the atomizing disc, the spraying is carried out either largely by electrostatic means or largely under the effect of the centrifugal force and the friction forces in the air of the end of the paint film.

Le produit pulvérisé qui a acquis par conduction juste avant la formation des gouttes une charge électrique est conduit en direction des objets à traiter sur lesquels il se dépose par le champ électrique existant entre le disque et lesdits objets. The pulverized product which has acquired by conduction just before the formation of the drops an electrical charge is conducted in the direction of the objects to be treated on which it is deposited by the electric field existing between the disc and said objects.

Le disque généralement placé à axe vertical est généralement monté sur une mécanique qui le déplace suivant un mouvement vertical de va-et-vient de façon à ce que ledit disque puisse pulvériser du produit sur toute la hauteur de la pièce. The disc generally placed with a vertical axis is generally mounted on a mechanism which moves it in a vertical reciprocating motion so that said disc can spray product over the entire height of the part.

Lorsque les pièces à traiter sont par exemple des parallélépipèdes tels que des réfrigérateurs, il est nécessaire, afin de recouvrir les quatre faces verticales, de présenter successivement en face du disque lesdites quatre faces. Ceci est obtenu par des mouvements successifs de rotation de la balancelle support de la pièce. When the parts to be treated are for example parallelepipeds such as refrigerators, it is necessary, in order to cover the four vertical faces, to present successively opposite the disc said four faces. This is obtained by successive rotational movements of the part support swing.

Pour que cette rotation puisse s'effectuer, pour un pas d'accrochage donné sans percussion des pièces entre elles, le diamètre de la boucle décrite par le couvoyeur autour du disque ne peut être inférieur à une certaine valeur. I1 existe donc des cas où le maintien d'une distance disque/pièces, acceptable pour obtenir un bon rapport produit déposé sur produit projeté, nécessite l'utilisation de disques de grands diamètres tels que 300 ou 400 mm par exemple. So that this rotation can take place, for a given attachment pitch without percussion of the parts together, the diameter of the loop described by the conveyor around the disc cannot be less than a certain value. I1 therefore exist cases where maintaining a disc / parts distance, acceptable for obtaining a good ratio of product deposited on projected product, requires the use of discs of large diameters such as 300 or 400 mm for example.

Dans le cas des disques dits à grande vitesse on utilise actuellement essentiellement des turbines pneumatiques entraî- nant directement le disque en rotation. In the case of so-called high-speed discs, pneumatic turbines are currently mainly used which directly drive the rotating disc.

La vitesse de rotation du disque monté sur la turbine d'entraînement est pour une pression d'air donnée, qui n'excède jamais 6 bars dans l'industrie, essentiellement fonction du diamètre du disque entraîné et du débit de produit pulvérisé. The speed of rotation of the disc mounted on the drive turbine is for a given air pressure, which never exceeds 6 bars in the industry, essentially a function of the diameter of the driven disc and the flow rate of sprayed product.

Pour des débits ordinaires de 20 à 30 litres/heure, la vitesse de rotation d'un disque de 300 mm monté sur une turbine à air parfaitement adaptée ne dépasse pas 5000 tours/minute. For ordinary flow rates of 20 to 30 liters / hour, the speed of rotation of a 300 mm disc mounted on a perfectly adapted air turbine does not exceed 5000 revolutions / minute.

Les moteurs électriques à haute fréquence qui pourraient fournir eux la puissance nécessaire doivent être isolés, par un arbre d'entraînement électriquement isolant, de la turbine et du disque portés à un haut potentiel; La résistance mécanique des isolants connus ne permet pas d'obtenir le résultat désiré. Pour des vitesses de rotation insuffisantes la finesse des particules pulvérisées n'est plus satisfaisante. The high frequency electric motors which could provide them with the necessary power must be isolated, by an electrically insulating drive shaft, from the turbine and the disc brought to high potential; The mechanical strength of known insulators does not allow the desired result to be obtained. For insufficient rotational speeds, the fineness of the sprayed particles is no longer satisfactory.

I1 n'est donc pas possible actuellement dans les cas de figure définis plus haut de revêtir correctement certaines pièces par voie de pulvérisation électrostatique par disque et notamment lorsque la vitesse des convoyeurs impose de gros débits de peinture.  I1 is therefore not currently possible in the cases defined above to correctly coat certain parts by electrostatic spraying by disc and in particular when the speed of the conveyors requires large paint flow rates.

Le dispositif suivant l'invention permet d'éviter ces inconvénients. Dans celui-ci en effet, il est possible d'entraîner sans arbre isolant des disques de diamètres compris entre 100 et 400 mm, avec des débits de produit pouvant atteindre 100 litres/heure à des vitesses comprises entre 10 000 et 20 000 tours par minute. The device according to the invention makes it possible to avoid these drawbacks. In fact, it is possible to drive discs of diameters between 100 and 400 mm without an insulating shaft, with product flow rates of up to 100 liters / hour at speeds between 10,000 and 20,000 revolutions per minute.

Le dispositif objet de llinvention est constitué d'un moteur hydraulique porté à la haute tension et entraînant sans l'intermédiaire d'arbre isolant le disque de pulvérisation
Selon l'invention, le moteur hydraulique du type à engrenage, est conçu pour éviter toute fuite d'huile le long de son arbre de sortie. Il est alimenté par un ensemble hydraulique connecté au moteur par des tuyaux haute pression électriquement isolants.The device object of the invention consists of a hydraulic motor brought to high voltage and driving without the intermediary of a shaft isolating the spraying disc
According to the invention, the hydraulic motor of the gear type is designed to prevent any leakage of oil along its output shaft. It is supplied by a hydraulic assembly connected to the engine by electrically insulating high pressure hoses.

La vitesse de rotation est réglable et dépend du débit d'huile délivré au moteur. The rotation speed is adjustable and depends on the oil flow delivered to the engine.

Les roulements à billes de l'ensemble d'entraînement sont protégés, côté disque,contre toute entrée de solvant ou de produit à projeter, par divers joints dont un joint d'air pneumatique. The ball bearings of the drive assembly are protected, on the disc side, against any entry of solvent or spray product, by various seals including a pneumatic air seal.

D'autres caractéristiques et avantages de cette invention ressortiront de la description faite ci-après en référence aux dessins annexés qui illustrent divers exemples de réalisation non limitatifs. Other characteristics and advantages of this invention will emerge from the description given below with reference to the appended drawings which illustrate various nonlimiting exemplary embodiments.

Soit selon figure 1 : le moteur hydraulique 3 est alimenté par une pompe 5 à piston à cylindrée réglable par commande manuelle ou automatique et entraînée par le moteur électrique 1 par l'intermédiaire de l'accouplement mécanique 2. Soit 7 un limiteur de pression permettant de ne pas dépasser une pression prédéterminée, notamment lors de la mise en route du moteur 3. Ce limiteur 7 permet un démarrage à pression limitée et évite ainsi la détérioration du matériel au démarrage. Le manomètre 8 indique la pression de fonctionnement. 12 est un filtre muni d'un manomètre et d'un clapet de sécurité, placé sur le retour de l'huile moteur. Either according to FIG. 1: the hydraulic motor 3 is powered by a piston pump 5 with adjustable displacement by manual or automatic control and driven by the electric motor 1 by means of the mechanical coupling 2. Or 7 a pressure limiter allowing not to exceed a predetermined pressure, especially when starting the engine 3. This limiter 7 allows a start at limited pressure and thus prevents deterioration of the equipment at start. The pressure gauge 8 indicates the operating pressure. 12 is a filter fitted with a pressure gauge and a safety valve, placed on the engine oil return.

L'arrêt de la rotation du disque est obtenu par l'arrêt du moteur électrique. Le moteur 3 qui entraine un disque à forte inertie mécanique continuerait alors à tourner en pompe pendant quelques minutes, en se vidant de son huile en cavitant et en se détériorant faute de lubrifiant si le clapet 9 et la valve de freinage 10 n'avarient pas été montés. The disc rotation is stopped by stopping the electric motor. The motor 3 which drives a disc with high mechanical inertia would then continue to run in pump for a few minutes, emptying of its oil while cavitating and deteriorating for lack of lubricant if the valve 9 and the brake valve 10 do not fail been mounted.

A l'arrêt de la pompe la pression d'alimentation disparaît ce qui entraîne la mise en fonctionnement de la valve de freinage 10 et la circulation en circuit fermé à travers le clapet 9 de l'huile contenue dans la boucle moteur/clapet.  When the pump stops, the supply pressure disappears, which causes the braking valve 10 to operate and the oil contained in the motor / valve loop to circulate in a closed circuit through the valve 9.

4 est le réservoir d'huile et ll un clapet assurant une contre-pression dans le circuit de refoulement. 4 is the oil tank and ll a valve ensuring a back pressure in the delivery circuit.

Un refroidisseur électrique thermostaté 5 permet de maintenir le circuit d'huile à la température idéale de fonctionnement du moteur 3. A thermostatically controlled electric cooler 5 keeps the oil circuit at the ideal engine operating temperature 3.

La figure 2 montre un exemple selon l'invention de réalisation d'un disque entraîné par moteur hydraulique. FIG. 2 shows an example according to the invention for producing a disc driven by a hydraulic motor.

Soit 3 le moteur hydraulique, 14 son arbre de sortie, 15 un système de protection des roulements à billes, 16 le disque de pulvérisation, 17 l'alimentation du disque en peinture, 18 la connexion au générateur haute tension et 19 l'isolateur électrique isolant la tête rotative de pulvérisation électrostatique du support porté à la masse. Either 3 the hydraulic motor, 14 its output shaft, 15 a ball bearing protection system, 16 the spraying disc, 17 the supply of the disc with paint, 18 the connection to the high-voltage generator and 19 the electrical insulator isolating the rotating electrostatic spray head from the grounded support.

Selon un autre mode de réalisation de l'invention, un accouplement élastique est placé entre le moteur hydraulique et le disque entraîné. According to another embodiment of the invention, an elastic coupling is placed between the hydraulic motor and the driven disc.

Ce dispositif objet de l'invention peut être utilisé dans tous les cas d'application de produits liquides sur des pièces à traiter défilant autour de l'axe de rotation du dit dispositif. This device which is the subject of the invention can be used in all cases of application of liquid products to parts to be treated scrolling around the axis of rotation of said device.

Une application particulièrement intéressante est l'application de peintures sur des pièces de grosses dimensions (réfrigérateurs ou containers par exemple)*  A particularly interesting application is the application of paints on large parts (refrigerators or containers for example) *

Claims (4)

REVEND ICAT IONSRESELL ICAT IONS 1. Tête à haute vitesse de rotation de type à disque électrostatique de pulvérisation de produits liquides tels que peintures ou vernis sur des objets à revêtir défilant autour du dit disque, caractérisée en ce que l'entraînement du disque s'effectue à l'aide d'un moteur hydraulique entrainant le disque à des vitesses de l'ordre de 10 000 à 20 000 tours par minute sans passer par l'intermédiaire dsun arbre d'entraînement électriquement isolant. 1. High speed head of the electrostatic disc type for spraying liquid products such as paints or varnishes on objects to be coated scrolling around the said disc, characterized in that the drive of the disc is carried out using a hydraulic motor driving the disc at speeds of the order of 10,000 to 20,000 revolutions per minute without passing through an electrically insulating drive shaft. 2. Tête suivant la revendication 1, caractérisée en ce qui concerne l'alimentation du moteur hydraulique en ce qu'elle est réalisée grâce à une pompe à débit réglable manuellement ou automatiquement et en ce qu'une valve de freinage placée sur le circuit retour permet à un clapet unidirectionnel monté en parallèle sur le moteur d'éviter la cavitation du moteur à l'arrêt de la pompe. 2. Head according to claim 1, characterized as regards the supply of the hydraulic motor in that it is produced by means of a flow pump adjustable manually or automatically and in that a brake valve placed on the return circuit allows a one-way valve mounted in parallel on the motor to avoid cavitation of the motor when the pump is stopped. 3. Tête suivant l'une des revendications 1 ou 2, caractérisée en ce que le couple de démarrage du moteur hydraulique est limité par un limiteur de pression placé en parallèle sur le circuit hydraulique en sortie de pompe. 3. Head according to one of claims 1 or 2, characterized in that the starting torque of the hydraulic motor is limited by a pressure limiter placed in parallel on the hydraulic circuit at the pump outlet. 4. Tête suivant l'une quelconque des revendications précédentes, caractérisée en ce que la température de l'huile dans le circuit hydraulique est maintenue à une valeur optimum grâce à un refroidisseur électrique thermostaté.  4. Head according to any one of the preceding claims, characterized in that the temperature of the oil in the hydraulic circuit is maintained at an optimum value thanks to an electric thermostatically controlled cooler.
FR8315743A 1983-09-29 1983-09-29 ROTATING HEAD FOR ELECTROSTATIC SPRAYING OF LIQUID PRODUCTS DRIVEN BY A HYDRAULIC MOTOR AT HIGH ROTATION SPEED Expired FR2552683B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR8315743A FR2552683B1 (en) 1983-09-29 1983-09-29 ROTATING HEAD FOR ELECTROSTATIC SPRAYING OF LIQUID PRODUCTS DRIVEN BY A HYDRAULIC MOTOR AT HIGH ROTATION SPEED

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8315743A FR2552683B1 (en) 1983-09-29 1983-09-29 ROTATING HEAD FOR ELECTROSTATIC SPRAYING OF LIQUID PRODUCTS DRIVEN BY A HYDRAULIC MOTOR AT HIGH ROTATION SPEED

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FR2552683A1 true FR2552683A1 (en) 1985-04-05
FR2552683B1 FR2552683B1 (en) 1986-03-21

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FR8315743A Expired FR2552683B1 (en) 1983-09-29 1983-09-29 ROTATING HEAD FOR ELECTROSTATIC SPRAYING OF LIQUID PRODUCTS DRIVEN BY A HYDRAULIC MOTOR AT HIGH ROTATION SPEED

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002093043A1 (en) * 2001-05-16 2002-11-21 Cnh Belgium N.V. Control arrangement and method for a hydraulic system
CN105465069A (en) * 2014-11-07 2016-04-06 芜湖新兴铸管有限责任公司 Hydraulic transmission system of centrifugal coating machine
CN108213163A (en) * 2017-12-14 2018-06-29 华南理工大学 A kind of horizontal digital-control rotary pressing processing system and control method
CN113103534A (en) * 2021-02-25 2021-07-13 海天塑机集团有限公司 Self-adjusting method and system for hydraulic turntable of injection molding machine

Citations (3)

* Cited by examiner, † Cited by third party
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US3937016A (en) * 1974-10-08 1976-02-10 Stan Gerald N Hydraulic safety circuit
EP0041008A1 (en) * 1980-05-27 1981-12-02 Bernard Marchand Rotatable spray head for an electrostatic-coating apparatus for applying liquid products such as paint and varnish

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Publication number Priority date Publication date Assignee Title
FR1490119A (en) * 1965-08-20 1967-07-28 Agie Ag Ind Elektronik Method and devices for hydraulically supporting and hydraulically driving an element
US3937016A (en) * 1974-10-08 1976-02-10 Stan Gerald N Hydraulic safety circuit
EP0041008A1 (en) * 1980-05-27 1981-12-02 Bernard Marchand Rotatable spray head for an electrostatic-coating apparatus for applying liquid products such as paint and varnish

Cited By (7)

* Cited by examiner, † Cited by third party
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WO2002093043A1 (en) * 2001-05-16 2002-11-21 Cnh Belgium N.V. Control arrangement and method for a hydraulic system
US6966180B2 (en) 2001-05-16 2005-11-22 Cnh America Llc Control arrangement and method for a hydraulic system
CN105465069A (en) * 2014-11-07 2016-04-06 芜湖新兴铸管有限责任公司 Hydraulic transmission system of centrifugal coating machine
CN105485076A (en) * 2014-11-07 2016-04-13 芜湖新兴铸管有限责任公司 Hydraulic transmission system of centrifugal lining coating machine
CN105465069B (en) * 2014-11-07 2018-05-25 芜湖新兴铸管有限责任公司 Centrifugal smearing machine Hydraulic Power Transmission System
CN108213163A (en) * 2017-12-14 2018-06-29 华南理工大学 A kind of horizontal digital-control rotary pressing processing system and control method
CN113103534A (en) * 2021-02-25 2021-07-13 海天塑机集团有限公司 Self-adjusting method and system for hydraulic turntable of injection molding machine

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