GB1503996A - Piledriving hammer and method of controlling the same - Google Patents

Abstract

1503996 Pile-drivers VAN KOOTEN BV 5 Dec 1975 [10 Dec 1974] 49935/75 Heading B3H In a method of regulating the supply of fuel per stroke to a diesel pile-driving hammer a measurement of the energy induced in the pile per stroke is made in each of at least two strokes, the fuel supply in each of these strokes is measured and related to the energy induced in the stroke and the fuel supply in a succeeding stroke is adjusted in accordance with the fuel supply in that one of the at least two strokes in which the greater or greatest total energy was induced in the pile. The strain induced in the pile is measured by strain gauges 60, Fig. 13, and converted to stress by a meter 61, the output of which is fed to an integrator 63. A signal 48 from the integrator 63 and a signal 66 corresponding to the quantity of diesel fuel supplied are fed to a computing device 65, in which the values of the signals are compared with those of previous strokes for fixing a programme for the fuel supply adjustment. The calculated output 49 of the device 65 and the measured signal 48 are fed to a comparator 46, which determines the optimum fuel supply adjustment. The output 50 of the comparator is fed to a control member 41a for operating a control slide 43a of an hydraulic cylinder 44a. The piston in the cylinder 44a, Fig. 10, pivots a bell-crank to alter the setting of a stop 33a and hence the volume of a fuel injection pump cylinder or cylinders 9. The items 41a, 43a, 44a, 33a, 7a, may be duplicated, Fig. 6 (not shown), to supply petrol to benzene to injection nozzles (30b), so as additionally either to accelerate or decelerate the rate of combustion of the diesel fuel.