Sames S.a.

Air Industrie, Societe Anonyme

Roger Tholome

Pierre Chabert

Adrien Lacchia

Jean-Pierre Burtin

Jean-Yves Correard

Gerard Degli

Daniel Belmain

Michel Gondrand

Laurent Faure

Pierre Fabre

Thierry Viguier

An electrostatic spraying installation for conductive liquid coating product comprises a circuit for distributing fluids including the conductive coating product. At least one coating product sprayer is fed by this circuit and is connected to a variable or interruptible high voltage supply. At least one insulated auxiliary coating product storage tank is adapted to be raised to the high voltage. The installation includes at least one rinsing product supply and at least one compressed air supply. The circuit comprises at least one mobile member isolator connected between two parts of the distribution circuit to isolate the upstream circuit part from the high voltage. The installation comprises an arrangement of valves on the upstream and downstream sides of the isolator connected to the rinsing product supply and to the compressed air supply for cleaning and purging the isolator before it is opened each time.

Electrostatic spraying installation for conductive liquid coating product

An electrostatic sprayer device for spraying products in powder form comprises an air-powder mixture pipe with an ejector orifice at one end. It has a charging electrode adjacent this orifice and a counter-electrode coaxial with and to the rear of the charging electrode relative to the direction in which the mixture is ejected from the pipe. This counter-electrode is external to the pipe and substantially perpendicular to the axis of the pipe, with the result that an annular space is defined between the two electrodes and around the pipe. The electrodes have a potential difference applied between them to generate an electric field which attracts free ions towards the counter-electrode. A blower adjacent the counter-electrode discharges into the annular space formed between the two electrodes and around the pipe.

Electrostatic sprayer device for spraying products in powder form

A sprayer installation suitable for spraying water-based paint includes a multi-axis robot carrying a sprayer. A conveyor carries objects to be sprayed past the robot. Respective circuits for distributing products to be sprayed comprise first connection devices at fixed locations within range of the robot. The robot carries a storage tank for the product to be sprayed at least during a spraying phase. This storage tank is connected to the sprayer to supply product to be sprayed to it. First complementary connection devices fitted to or communicating with the storage tank cooperate with the first connection devices of any selected distribution circuit.

Sprayer installation

A spray nozzle comprises a liquid passage, spray air passages adapted to create a divergent jet of sprayed liquid and shaping air passages for shaping this jet. The shaping air passages include first passages having axes coplanar with the liquid passage. They converge to form a divergent flattened jet coplanar with the liquid passage and having a median plane perpendicular to the plane containing the axes of the first passages and the liquid passage. The shaping air passages also include second passages having axes disposed symmetrically to each side of the aforementioned plane and directed towards the aforementioned median plane.

Spray nozzle

Electrostatic spraying equipment having, in a working area likely to contain inflammable mixtures, at least a terminal part of a high-voltage generator with an electrode for charging a jet of material sprayed from a sprayer. At least one low-voltage line connects the terminal part of the generator to a remotely sited power supply equipped with cut-out device. A protective device designed to prevent repeated arcing in the working area as a result of deterioration of the low-voltage line comprises, in series with the line, a sensing device for sensing a current lower than a predetermined minimum current. A control device responsive to the sensing device are connected to the aforementioned cut-out device so as to operate them when a current in the line lower than the predetermined minimum is sensed.

Protective device for electrostatic sprayer equipment

Electrostatic painting apparatus comprises a support moveable at high speed along a slide. On this support is a pneumatically controlled paint sprayer producing an electrostatically charged jet of paint. A paint feed assembly comprising a pressure regulator and a discharge valve is juxatposed with the sprayer. Sprayer control devices are disposed on a chassis connected to the feed assembly by a harness. These control means comprise three gas pressure regulators supplying the sprayer and controlling the paint pressure regulator and a high DC voltage generator. The position of the chassis relative to the slide is determined such that the harness is as short as possible, so as to reduce to a minimum the command transmission time. This arrangement makes it possible to reduce the weight carried by the support. The units carried by the chassis are remotely controlled by a microprocessor-based unit over a remote control line.

Electrostatic painting apparatus

A device for rapidly discharging without arcing a high-tension DC voltage source includes a cylinder of an insulative material in which slide two electrode pistons. These are equipped with internal auxiliary pistons which carry needles which can be deployed so as to project beyond the domed ends of the electrode pistons. The electrode pistons are connected to the terminals of the high-tension voltage source. When compressed air is fed into the central part of the cylinder, the electrode pistons and the auxiliary pistons are driven towards the ends of the cylinder. The rounded domes and the increased pressure of the air provide a high degree of insulation. Once the high-tension DC voltage source has been switched off, the center of the cylinder is vented to atmosphere. The auxiliary pistons are driven towards one another by springs, entraining the electrode pistons and deploying the needles. A corona discharge is established and this discharges the capacitance of the source before the needles come into contact with one another.

Device for rapidly discharging without arcing a high-voltage source

A reciprocating drive system moves a body of defined inertia, such as a carriage supporting electrostatic spraying means, at full speed between two points at which the direction of movement is reversed. The drive system includes an electric motor with polyphase stator windings and a squirrel cage rotor. Transducers responsive to the arrival of the moving body at the aforementioned points produce output signals controlling a phase switching system which reverses the direction of rotation of the motor. Reversal of the motor torque reverses the direction of movement of the moving body within a given travel and within a given time interval to full speed in the opposite direction. A stator current limiter provides positive coupling in an operative condition and no coupling in an inoperative condition with the motor running at full speed. The motor is selected so that the inertia of its rotor closely matches that of the moving body. The current limiting means are arranged to be in the operative condition irrespective of the position of the moving body.

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La Tronche, France

Roger Tholome