Method for washing the interior surfaces of tanks and containers
First Claim
1. A method of washing a surface inside a tank, comprising:
- arranging a washing head in a fixed position inside said tank, which washing head supports a nozzle holder fitted with a nozzle, adapted for ejecting a beam of washing fluid, which nozzle holder supports said nozzle rotatable about a first axis and a second axis, said second axis being oriented substantially perpendicular to said first axis,surveying the surface to be treated by said beam in order to effect the washing, estimating corresponding angular orientations of said nozzle, estimating required dosage levels of beam treatment in respect of selected different zones of said surface,carrying out a washing operation by forcing washing fluid to be ejected through said nozzle while rotating said nozzle holder about said axes in such way that for a full revolution about said first axis said nozzle holder performs an incremental rotational movement about said second axis, until said nozzle has traced a path, by which said beam has scanned substantially all of said surface,monitoring during said washing operation the nozzle holder angular movement along said path, andcontrolling during said washing operation the intensity of beam treatment based on the result of said monitoring in order to adapt it to the respective dosage levels estimated to be required for respective zones.
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Accused Products
Abstract
A method for washing the interior surfaces of tanks with a washing head is provided with a nozzle (28) which ejects a liquid beam and which is rotatable about a first (11) and a second (34) axis whereby the nozzle is allowed to cover a two-dimensional solid angle. The washing head is controlled in such a manner that for an entire revolution about the first axis, the nozzle performs a small rotation about the second axis, and that over a number of revolutions about the first axis the nozzle follows a path which covers the entire a solid angle. The drive mechanism for rotating the washing head is arranged externally of the conduits carrying washing liquid in order to avoid loss of washing pressure and wear of the drive mechanism. According to the invention the movement of the nozzle along the defined path is monitored and the result of the monitoring is utilised to control the energy density of the beam in order that it is reduced when the beam is directed at the zones which do not require the maximum energy.
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Citations
8 Claims
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1. A method of washing a surface inside a tank, comprising:
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arranging a washing head in a fixed position inside said tank, which washing head supports a nozzle holder fitted with a nozzle, adapted for ejecting a beam of washing fluid, which nozzle holder supports said nozzle rotatable about a first axis and a second axis, said second axis being oriented substantially perpendicular to said first axis, surveying the surface to be treated by said beam in order to effect the washing, estimating corresponding angular orientations of said nozzle, estimating required dosage levels of beam treatment in respect of selected different zones of said surface, carrying out a washing operation by forcing washing fluid to be ejected through said nozzle while rotating said nozzle holder about said axes in such way that for a full revolution about said first axis said nozzle holder performs an incremental rotational movement about said second axis, until said nozzle has traced a path, by which said beam has scanned substantially all of said surface, monitoring during said washing operation the nozzle holder angular movement along said path, and controlling during said washing operation the intensity of beam treatment based on the result of said monitoring in order to adapt it to the respective dosage levels estimated to be required for respective zones. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification