| 摘要 |
<p>A metal spraying apparatus comprises a gun having convergent guide passages (36, 38) through which metallic wires are fed. An electrical potential is applied across the wires, by conductor elements (54), to cause arcing between the wires were they emerge from the guide passages, which melts the wires. A stream of compressed air causes molten metal droplets to be carried from the arcing zone towards the surface to which a metallic coating is to be applied. The apparatus also comprises a supplying device, to supply electricity and air under pressure to the gun. The conductor elements extend within conduits (18) through which air is fed to the gun, and the gun comprises a valve (9) for cutting off the flow of air through the gun. The supplying device comprises control means (82) which is responsive to such cut off, to cut off the supply of electricity to the gun.</p> |
