Closed loop hydraulic drill feed system

Details Closed loop hydraulic drill feed system Closed loop hydraulic drill feed system

F - Mech Eng,Light,Heat,Weapons

15

B

255/18, 138/74

F15B 11/08 (2006.01) E21B 19/086 (2006.01)

Patent

CA 2017149

ABSTRACT OF THE DISCLOSURE A closed loop hydraulic system for use in a rotary drilling apparatus includes an extendible-retractable feed cylinder and a valve for biasing the feed cylinder. A variable, reversible displacement pump is provided for pumping fluid from either of the first and second pump ports, including pumping fluid to the feed cylinder. A reservoir retains a supply of fluid for the system. A check valve is provided for supplying additional fluid to the pump in response to the feed cylinder being extended. An overcenter valve is connected to each of the first and second ports for controlling flow from the system in response to pressures received from the first and second ports when the feed cylinder is extended and retracted.

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