Metal working – Method of mechanical manufacture – Electrical device making
Patent
1994-02-07
1995-01-24
Cuda, Irene
Metal working
Method of mechanical manufacture
Electrical device making
297265, B23P 1500
Patent
active
053832710
ABSTRACT:
Apparatus for extracting a heat exchanger tube assembly from a heat exchanger shell includes an extractor frame, an extractor body moveable with respect to the frame, and powered extraction members for literally moving the extractor body with respect to the frame. A plurality of rollers are provided each supporting the extractor frame and extractor body, and a plurality of respective drive motors each power one of the rollers for manipulating the apparatus relative to the heat exchanger shell. Both forward and reverse rotation of a respective roller and pivotable rotation of the roller with respect to the frame for steering capability of the apparatus may be provided by control means positioned such that the operator need not be carried by the assembly. A plurality of hydraulic cylinders each secured to the extractor frame are provided for elevating the extractor body to a desired position with respect to the heat exchanger shell for extraction and reinsertion of the tube assembly. According to the method the assembly may be easily positioned with respect to the heat exchanger shell by controlling both forward/reverse and pivotable steering of each roller with respect to the frame. Once positioned, the extractor frame and body may be elevated to a desired elevation to remove the heat exchanger tube assembly or reinsert the tube assembly into the shell without damaging the heat exchanger components.
REFERENCES:
patent: 4053062 (1977-10-01), Travis
patent: 4805653 (1989-02-01), Krajicek et al.
patent: 4856545 (1989-08-01), Krajicek et al.
patent: 5169281 (1992-12-01), Boisture
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