RESULTS OF TESTS ON TWO CUTTER HEADS OPERATING IN SAND

Presented are the results of experimental investigations dealing with the performance of two different cutter heads:- A conventional cutter of the crown type with six blades, each with eight teeth, scaled down from an existing head 1:7. A cylindrical cutter designed by Prof. ir. W.A. Bos of the Delft University of Technology. The cutter blades are fixed between a top horizontal ring and a bottom disc, mounted on a vertical shaft. Within the head is a shield, extended over 180 deg to lead the soil cuttings into the suction mouth. The experiments are restricted to sand with a mean grain size of 240 mu m. The solids-liquid mixture velocity in the phi 100 delivery line is kept constant at 3.0 ms to the minus one power for each experiment. No alterations have been made as yet to the shape and position of the suction mouth. On the crown cutter the suction mouth finishes just below the flat shield over the cutter. The main conclusions are:-The volumetric efficiency as well as the production per kW are better for the cylindrical cutter. The production appears to be better for the crown cutter due to the larger physical size. A relatively small increase in height on the cylindrical cutter should make the production equal to or even better than the crown cutter. The cutting force increases only 25% against a three times increase of the cone resistance. The cutting force increases proportionally to the square of the swing velocity.

  • Supplemental Notes:
    • Paper F-1 from BHRA Fluid Engineering Symposium, University of Kent, Canterbury, England.
  • Corporate Authors:

    British Hydromechanics Research Association

    Cranfield MK43 0AJ, Bedfordshire,   England 
  • Authors:
    • Joanknecht, LWF
  • Publication Date: 1975-9

Subject/Index Terms

Filing Info

  • Accession Number: 00128427
  • Record Type: Publication
  • Source Agency: British Hydrodynamics Research Association
  • Files: TRIS
  • Created Date: Jan 14 1976 12:00AM