| 摘要 |
Heat, dust and gases develop during thermal cutting. Dust and gases pass into the immediate and wider surroundings of the cutting site, and as a result the concentration at the workplace is often greater than permissible. Harmful substances above the workpieces cannot be caught completely by means of suction funnels. The symmetry of the flame and jet of the torch is disturbed by the high flow velocity of the air drawn in. According to the invention, the harmful substances accumulating above the workpieces during the thermal cutting are reliably caught owing to the fact that an annular suction chamber surrounds the torch and the air drawn in flows parallel to the torch axis, is then deflected and passes through intake openings into an annular passage (Fig. 1). The suction-ring chamber consists of two radial halves. To set up and monitor the torch, one radial half, pneumatically controlled, can be swung out (Fig. 2). The ultra-violet radiation arising during plasma cutting is effectively screened by the suction-ring chamber and the indirect ozone formation in the immediate and wider surroundings of the torch is prevented. <IMAGE>
|
