Fluid sprinkling – spraying – and diffusing – Distributor continuously moves relative to support during... – Compound motion of distributor or terminal member about...
Patent
1990-11-09
1993-04-20
Kashnikow, Andres
Fluid sprinkling, spraying, and diffusing
Distributor continuously moves relative to support during...
Compound motion of distributor or terminal member about...
2392631, 2392633, 239264, B05B 302
Patent
active
052038424
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a nozzle arrangement for a high pressure liquid jet for use in a device by means of which materials can be removed, roughened or cleaned.
Such devices are used, in particular, in building construction and mining and in tunnelling. They are employed, for example, in renovation of concrete constructions. Damage is increasingly being observed in concrete constructions such as bridges and viaducts built in earlier years, which require renovation as, otherwise, the damage might even necessitate demolition and reconstruction of the respective construction. For this purpose the defective outer layer of concrete has to be removed and the iron reinforcement possibly exposed and cleared of rust to enable a new layer of concrete or a new coating of concrete to be applied.
Break-out hammers were initially used to remove the defective concrete. The iron reinforcement was then cleared of rust by sandblasting. This mode of operation has some serious disadvantages. On the one hand, the labour costs are very high. On the other hand, the result achieved by carrying out this method of breaking out the defective concrete is qualitatively inadequate, particularly since damage to the iron reinforcement and the solid concrete is almost unavoidable owing to the impacts and vibrations.
There have therefore been attempts to find a solution to this problem in that removal has been effected using a water jet directed at high pressure and high speed onto the concrete surface. Machinery has been developed for this purpose which moves along slowly on wheels, has, on its front face, a water nozzle reciprocating on a rail transversely to the direction of travel and is remotely controlled for safety reasons.
The water nozzle stops briefly at each end of its transverse movement before moving back again. In the course of this transverse movement, the water nozzle is also set into an oscillating movement transversely thereto. Owing to the very great force of the water jet, normal holes are repeatedly shot into the concrete owing to the technically induced brief stoppage of the water nozzle at the end of the transverse movement. The above-mentioned oscillation of the nozzle also leads to uneven removal as the nozzle head is consequently not constantly at the same distance from the material surface to be treated. The distance is smaller in the centre of the oscillating movement than at the two ends. Owing to these disadvantages, it is often impossible satisfactorily to apply the new concrete layer to close any holes which may be present. It is therefore anticipated that fresh damage will occur in the foreseeable future to concrete constructions renovated in this way. For these reasons, it was usually necessary to adapt this mode of operation.
Accordingly it is an object of the invention to provide a nozzle arrangement which does not have the disadvantages of the known nozzle arrangements.
According to the invention, there is provided a nozzle arrangement for a high pressure liquid jet for use in a device for treating surfaces by removing material from, roughening or cleaning said surfaces; said arrangement comprising a nozzle having an elongate nozzle body having a longitudinal axis, the nozzle body being rotatably mounted about its longitudinal axis; a nozzle head inclined at an angle of approximately 30.degree. to the longitudinal axis of the nozzle body and communicating with the interior of said nozzle body; means for maintaining the nozzle head at a substantially constant distance from a planar surface to be treated; means for generating a high pressure liquid jet to issue from the nozzle head and means for reciprocating the nozzle body in partial rotations about its longitudinal axis in opposite directions to cause the high pressure liquid jet issuing from the nozzle head to strike the surface to be treated with a recurring arc-shaped pivoting movement.
Preferably, means are provided for superimposing on the said partial rotations of the nozzle body, further rotations of said nozzle body.
The nozzle body i
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Brenner Hartmut
Mark Edi
Gell Harold
Kashnikow Andres
Mark Edi
Morris Lesley D.
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