B - Operations – Transporting – 66 – D
Patent
B - Operations, Transporting
66
D
364/33, 138/74
B66D 1/40 (2006.01) B66C 13/44 (2006.01) E21C 29/16 (2006.01) E21C 35/24 (2006.01) G05B 19/07 (2006.01) G05D 3/14 (2006.01)
Patent
CA 1149977
ABSTRACT OF THE DISCLOSURE In a method for controlling a winch of a mining machinery, the di- rection of operating a winch and speed thereof are controlled by changing the position of a control element of a fluid pump for supplying a fluid into a fluid pressure recirculating circuit, by means of a device incorporating the fluid pressure recirculating circuit and a control circuit. The method is characterized by the steps of feeding ON/OFF signals for giving an instruction of a position of a control element to a bi-polar pulse generator; feeding pulses from the bi-polar pulse generator to a reversible BCD counter by press- ing any of push buttons; comprising a voltage generated via a D/A converting circuit from the reversible BCD counter with a voltage generated from a poten- tiometer coupled to the control element according to a position of the control element to be selected, thereby controlling the instruction of the position of the control element; and setting a speed of the winch by the number of pressing any of the push buttons.
358828
Ito Keishi
Yamada Ryuji
Fetherstonhaugh & Co.
Kabushiki Kaisha Mitsui Miike Seisakusho
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