Cleaning and liquid contact with solids – Apparatus – Automatic controls
Patent
1998-05-20
2000-02-29
Stinson, Frankie L.
Cleaning and liquid contact with solids
Apparatus
Automatic controls
134 57R, 134122R, 134181, 134198, 2392631, 239264, B08B 302
Patent
active
06029681&
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to an apparatus for descaling semi-finished products, in particular thin slabs of steel strips in rolling mills, by means of highly pressurized water that is sprayed through a nozzle device onto the surface of the semi-finished product which is moved in relation to the nozzle device, wherein the nozzle device is arranged for movement by a drive under the control of a control device having a sensor adapted to determine the distance of the nozzle device from the surface of the product, said movement having a vertical component with regard to the surface. More particularly, this invention relates to such an apparatus wherein a plurality of nozzle devices are attached to a bar which is mounted to a fixed carrier by means of a four bar linkage means which is pivotable by the drive, and in that the control device is provided for actuating the drive in response to an output signal of the sensor, which is designed as a displacement transducer, for keeping constant the distance of the nozzle device from the surface of the semifinished product.
BACKGROUND OF THE INVENTION
In a known apparatus of this kind (JP-A-52 2 8 526) the upper portion of a nozzle device is controlled in response to signals of a thickness sensor by means of a vertical lifting device for compensating thickness variations of the products so as to keep constant the distance between the nozzle openings of the upper nozzle device and the surface of the semifinished product. When hot-rolling slabs and steel strips, the forging scales have to be removed before performing the rolling process to obtain a good surface. It is known to carry out such a descaling process by means of spraying highly pressurized water at pressures of about 1000 bar onto the surface to be descaled. A known descaling apparatus for descaling by means of highly pressurized water is described in U.S. Pat. No. 5,502,881. In the nozzle device described in this patent, a plurality of rotating nozzle heads each having four nozzles distributed around the outer circumference thereof for spraying the highly pressurized water, are attached to a girder fixedly mounted and disposed transversely to the moving direction of the strip conveyed underneath and at such a distance that bulgings and unevenness of the strip conveyed past the nozzle device do not lead to a collision. This distance is relatively large in the known apparatus. This leads to a reduction of the spray pressure of the highly pressurized water at the workpiece. A sufficiently high spraying pressure can only be achieved by increasing the water pressure or the amount of water, which results in a great power consumption. A reduction of the distance of the nozzle device to the strip surface is not possible because of the above described risk of a collision.
OBJECTS AND SUMMARY OF THE INVENTION
The object of the invention is to provide an apparatus of the above mentioned kind which permits a reduction of the distance between the surface of the steel strip and the nozzle device.
This object is achieved by attaching a plurality of nozzle devices to a bar which is mounted at a fixed carrier by means of a four bar linkage means, which is pivotable by a drive, and in that a control device is provided for actuating the drive in response to an output signal of a sensor, which is designed as a displacement transducer, for keeping constant the distance of the nozzle device from the surface of the semifinished product.
In the apparatus of the invention, owing to its movable arrangement susceptible to effect a movement having a vertical component with respect to the surface of the semi-finished product, the nozzle device is automatically guided by the control means to follow an unevenness of the strip or a bulging at the leading end of the strip while maintaining a pre-defined small target distance to said surface. With constant spray pressure existing at the nozzle outlet, the spray pressure at the work piece is increased thereby. The water pressure in the nozzle or the amount of water can thus b
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Gaydoul Jurgen
Gieseler Wolfgang
Hermetic Hydraulik AB
Stinson Frankie L.
Thompson John C.
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