Fluid sprinkling – spraying – and diffusing – With means fusing solid spray material at discharge means – Wire or rod type supply
Patent
1980-05-12
1982-11-02
Kashnikow, Andres
Fluid sprinkling, spraying, and diffusing
With means fusing solid spray material at discharge means
Wire or rod type supply
219 7614, B05B 722
Patent
active
043569714
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION OF INVENTION
A conventional metal spraying apparatus comprises a spraying device comprises a body, feeding mechanism for simultaneously feeding two metallic wires or rods (hereinafter referred to for convenience as "wires") through two guide passages which converge forwardly in the direction of wire feed, connecting means which may be connected to a supply of electricity remote from the device and which establishes an electric potential across said wires to cause an arc to be established between the wires where they emerge from said guide passages so as to melt with wires, and delivery means for delivering a stream of compressed air or other non-combustible gas (hereinafter referred to for convenience as "an air jet") relative to the wires and the arc therebetween so as to cause molten metal droplets to be carried away from the arcing zone on the air jet from the spraying device towards a surface to which a coating of metal is to be applied. Such a metal spraying device is hereinafter referred to as being of the kind specified and an example of such a device is described in the Specification of our U.K. Pat. No. 1,540,810.
Conventionally the wires are drawn by the feeding means from reels; in particular for hand-held spraying devices, the reels are mounted separately from the device itself, and the feeding means operates to draw the wires from the reels into guide sleeves extending from the guide passages of the spraying device.
Conveniently, the feeding mechanism comprises an air motor, so that, additional to the air supply needed to establish the air jet, an air supply must also be provided to drive the air motor. Further air may be utilised to establish air flow around the wires, to reduce the tendency for them to overheat whilst in the guide passages and to blow detritus from the wires.
The particle size of the atomised metal which is carried from the arcing zone, and the smoothness of the finished metallic coating, is dependent upon the rate of air flow through the arcing zone. For this reason, it is desirable to use a high air flow rate through the arcing zone, and typically an air flow rate of about 50 cu.ft. of air per minute is utilised.
In view of the air pressures conventionally used in factory premises and in view of the requirement to retain flexibility of the metal spraying device, it is conventional practice to utilise separate conduits, usually in the form of flexible hoses for the air jet and for the air motor, since if all the air were supplied through a single hose, problems would be caused by the size and inflexibility of the hose.
Additionally, conventionally the spraying device is connected to a source of electricity by two insulated conductors, which conventionally are copper stranded cable having an effective cross-sectional area of 70 sq.mm. capable of delivering a current of 300 amps to the metal spraying device.
Thus, a conventional spraying device of the kind specified may comprise six supply conduits, one being an air hose for the air jet, one being an air hose for the air motor, two wire guide sleeves for the wires themsevles, and two insulated electrical conductors.
It is frequently desired to spray a metal surface by the use of a spraying device of the kind specified, in the form of a hand-held gun. Typically, such a gun weighs about 14 lbs., but, because of the six supply conduits, is not easy to operate such a spray gun in a manner which provides high quality metal spray finishes.
An additional difficulty which is encountered is that it is often necessary to use the device some distance from the supply of electricity, some of the supply conduits being trailed across the floor. A not uncommon problem occurs when a fork lift truck or the like requires to traverse the floor area, since utilising the conventional copper stranded cable construction, the weight of a fork lift truck on these can crush the conductor causing a hot spot to develop. Thus, it is a general requirement that a fork lift truck shall not be driven across the insulated conductors, but because o
REFERENCES:
patent: 2765144 (1956-10-01), Layden
Kashnikow Andres
Metallisation Limited
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