| 摘要 |
<p>The invention relates to a method and device for sandblasting, especially removing in a precise manner and/or compacting and/or coating solid surfaces, such as removing defective spots of paint from coats of lacquer, smoothing out soldered and welded joints, removal of contaminated concrete coatings or rust coatings, hardening, planing or coating metal surfaces, wherein a sandblasting agent is added by means of gravity and/or due to the effect of an injector to a carrier air flow produced by an underpressure, conveyed in a flexible hose- line system ( 13 ) to a jet lance ( 14 ) before being guided via a processing surface subject to low pressure by a sandblasting chamber, whereupon it is returned in the air flow, purified and returned to the circuit, whereby acceleration of the sandblasting agent is produced by the low pressure and the sandblasting chamber is displaced from one processing surface to another. The aim of the invention is to increase the sandblasting speed in a significant manner while at the same time economically adjusting the amount of power furnished to the processing surface for various wide-ranging fields of application using as little power as possible yet providing high flexibility and ecologically compatible recovery and reutilization of the sandblasting means. In order to achieve this, the sandblasting agent receives at least one additional energy pulse from a gas flow which is placed at least under atmospheric pressure and suctioned by the low pressure in order to reach a final speed which is significantly greater than the speed of the carrier air flow downstream from the area where dosing occurs. The final speed makes it possible to adjust the amount of power applied to the surface to be processed according to the following parameters: type and forms of the surface to be processed and the sandblasting agent, degree in which the carrier air flow is charged with the sandblasting agent, low pressure in the carrier air flow, and time and temperature of sandblasting.</p> |
