초록 ▼

A rock drill feed system moves a drill toward and away from a wall with a reciprocating hydraulic motor powered by pressurized fluid. The pressurized fluid is controlled by a movable control valve that has a first position obtained manually to move the drill inwardly to drill, a second position obta

A rock drill feed system moves a drill toward and away from a wall with a reciprocating hydraulic motor powered by pressurized fluid. The pressurized fluid is controlled by a movable control valve that has a first position obtained manually to move the drill inwardly to drill, a second position obtained automatically when the drill has completed drilling, and a third position obtained automatically when the drill has been completely withdrawn. The sensing of the location of the drill to position the control valve is accomplished by measuring the pressure and flow rate of the hydraulic fluid delivered to the motor with pressure responsive switches. When the pressure exceeds a preselected level and the flow rate drops below a preselected level, the two pressure switches close to produce a signal that moves the valve to another position.

대표청구항 ▼

A control means for use in a drill feed system of the type having a driving means connected to receive pressurized fluid to move a drill, a pressurized fluid source, and a connecting means for delivering pressurized fluid from the fluid source to the driving means; said control means comprising: a p

A control means for use in a drill feed system of the type having a driving means connected to receive pressurized fluid to move a drill, a pressurized fluid source, and a connecting means for delivering pressurized fluid from the fluid source to the driving means; said control means comprising: a pressure means for measuring the pressure of the fluid delivered to the driving means to produce a signal indicating fluid pressure level; a pressure differential means for measuring the flow of the fluid delivered to the driving means to produce a signal indicating fluid flow rate: a sensing means responsive to the signals of the pressure means and pressure differential means for producing a signal indicating a preselected fluid pressure level and a preselected flow rate; and a flow means for controlling the direction of fluid flow to the driving means in response to the signal of the sensing means.