摘要:
A powder supply system for a powder-coating installation, especially a parts painting installation using electrostatic powder, according to the invention, comprises a tank designed to contain the powder, means for feeding powder into the tank, means for injecting compressed air into the bottom of the tank in order to fluidize the powder, and an exit pipe in which the powder is entrained by the air from the tank, this pipe being connected to at least one powder using device situated at a distance, in particular a spray gun. The system also includes means for reducing the pressure in the tank below that of the feed means in order to fill the tank with powder.
摘要:
A process to prepare new catalysts made from mixed metal oxides of transition metals, which involves the preparation of precursors and synthesis of these materials in oxide form from the preparation of a sol-gel formed from inorganic salts of these metals. An advance in the preparation of these catalysts made of mixed transition metal carbides and nitrides is proposed, providing an alternative way to the process of synthesis by solid-state reaction. The final product, in extruded form, has textural and mechanical properties superior to those obtained by the known techniques in the state of the art, and with better catalytic activity for hydrotreatment reactions.
摘要:
A pneumatically controlled needle valve including a cylindrical body intended to be mounted in a bore of a device, two annular sealing surfaces delimiting a chamber connected to a compressed-air supply device, a first compartment arranged inside the body communicatively with the chamber, a second compartment, a piston separating the first and second compartments, a rod having the piston secured thereto, the rod protruding axially from the body, a needle disposed on the rod intended, depending on a position of the needle, to bear or not to bear against a seat of the bore, at least one spring disposed in the second compartment, the spring acting on the rod in a direction for closing the valve by pressing the needle onto the seat, while air under pressure from the compressed air supply device acts on the piston in the opposite direction, the rod passing with sealing through a front end of the body, and a plug for closing a rear end of the body, the plug being connected to the body in such a way as to be prevented from a translational movement but free to rotate thereon, the plug being externally threaded to be screwed into a lapping of the bore.
摘要:
An insulated hose for a high voltage paint application apparatus including an inner hose containing a fluid or paint charged at a high voltage. The flexible inner tube hose is arranged inside at least one flexible mechanical protection tube or layer and an air excluding medium is enclosed between flexible inner tube and first flexible mechanical protection layer. A mechanical protection layer may be surrounded by an electrical protection layer which is grounded. A system for applying paint or other fluid materials at a high voltage is also described.
摘要:
An insulated hose for a high voltage paint application apparatus including an inner hose containing a fluid or paint charged at a high voltage. The flexible inner tube hose is arranged inside at least one flexible mechanical protection tube or layer and an air excluding medium is enclosed between flexible inner tube and first flexible mechanical protection layer. A mechanical protection layer may be surrounded by an electrical protection layer which is grounded. A system for applying paint or other fluid materials at a high voltage is also described.
摘要:
The invention relates to a method and a device for protecting fuel injectors in a turboshaft engine. The protection is carried out by injecting compressed air directly into the injectors. The air thus directly purges the injectors and evacuates the fuel present in them into the combustion chamber.
摘要:
A system for spraying a powder coating product includes a rotary sprayhead which is preferably of the type which is electrostatically charged. The sprayhead has a rotary part which can be driven in rotation. A narrow flow space in the sprayhead in the form of a flat ring incorporates a flow chicane forming an impact surface on the path of the coating product.
摘要:
A process to prepare multi-metal materials based on transition metals, using co-precipitation of mixed compound from solutions containing the metals, more specifically a process to prepare multi-metal materials based on transition metals, using co-precipitation, preferably seeking a condition of formation of a gel, from the mixture of precursor solutions containing the metals. The parameters of the process are set in such a way that the material is able to be molded by extrusion, obtaining extruded material with superior physico chemical properties, which may be used as an adsorbent, a catalyst or catalyst support, or even as filler in the reactor or column.
摘要:
A machine (4) is provided for removing dust from carbodies, before the paint coatings are applied to said bodies. Said machine is built on the principle of feather rollers rotary mounted about their central axis and rotationally driven, such as to engage the carbodies moved forward on a conveyer. At least two feather rollers (26, 27) extend one after the other, and are synchronously driven, with the angle between the respective axis (28, 29) of the consecutive rollers (26, 27) being adjustable by changing the tilting of at least one of their axis (28, 29). The machine can therefore accommodate varying carbody profiles. Such a design is applicable to dust removing roof and side machines.
摘要:
The invention concerns a method for regulating flow of powder in a device including an injector (2) sucking the powder (6) from a container (4) by Venturi effect, the injector (2) receiving at its intake an injection air flow (Dai), and, proximate to an outlet, a dilution air flow (Dad). Two proportional electromagnetic valves (12, 13) are arranged respectively on the injection air intake (7) and on the dilution air intake (8). Said electromagnetic valves (12, 13) are controlled by an adjusting module (11) which receives a powder flow setpoint (Dp) and which determines injection air (Dai) and dilution air (Dad) flow rates taking into account stored coefficients. (A, B) and a minimum total air flow (Dam) to be observed, based on the formula Dp/A.Dai B.Dad. The invention is useful for feeding a spraying appliance (10) with paint or any other powder coating product.