POWER SHOVEL HAVING ISOLATED HYDRAULIC DIPPER ACTUATOR
First Claim
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1. A hydraulic system for a power shovel, comprising:
- a cylinder operatively connectable to a dipper door of the power shovel;
a reservoir located at and fluidly connected to the cylinder;
an accumulator located at and fluidly connected to the cylinder in parallel with the reservoir; and
a control valve disposed between the cylinder, the reservoir, and the accumulator, the control valve being movable to selectively direct fluid from the cylinder into the accumulator and fluid from the reservoir into the cylinder.
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Abstract
A hydraulic system for a power shovel is disclosed. The hydraulic system may have a cylinder operatively connectable to a dipper door of the power shovel, a reservoir located at and fluidly connected to the cylinder, and an accumulator located at and fluidly connected to the cylinder in parallel with the reservoir. The hydraulic system may further have a control valve disposed between the cylinder, the reservoir, and the accumulator. The control valve may be movable to selectively direct fluid from the cylinder into the accumulator and fluid from the reservoir into the cylinder.
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Citations
20 Claims
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1. A hydraulic system for a power shovel, comprising:
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a cylinder operatively connectable to a dipper door of the power shovel; a reservoir located at and fluidly connected to the cylinder; an accumulator located at and fluidly connected to the cylinder in parallel with the reservoir; and a control valve disposed between the cylinder, the reservoir, and the accumulator, the control valve being movable to selectively direct fluid from the cylinder into the accumulator and fluid from the reservoir into the cylinder. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A hydraulic system for a power shovel, comprising:
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a cylinder operatively connectable between a dipper body and a base edge of a dipper door; an accumulator fluidly connected to the cylinder; and a control valve disposed between the cylinder and the accumulator, the control valve being movable to selectively actuate the cylinder to release and lock pivoting movement of the dipper door. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A power shovel, comprising:
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a body; a boom pivotally connected at a base end to the body; a dipper handle pivotally connected at a base end to a midpoint of the boom; a dipper pivotally connected to a distal end of the dipper handle, the dipper having a dipper body and a dipper door pivotally connected at a base edge to the dipper body; a single-acting cylinder connected at a first end to the dipper body; a link connecting an opposing second end of the single-acting cylinder to the base edge of the dipper door; a reservoir located at the dipper and fluidly connected to the single-acting cylinder; an accumulator located at the dipper and fluidly connected to the single-acting cylinder in parallel with the reservoir; a first control valve disposed between the single-acting cylinder, the reservoir, and the accumulator, the first control valve being movable to selectively direct fluid from the single-acting cylinder into the accumulator and fluid from the reservoir into the single-acting cylinder; an auxiliary actuator; and a second control valve disposed between the accumulator and the auxiliary actuator, the second control valve being movable to selectively direct fluid from the accumulator to the auxiliary actuator and from the auxiliary actuator to the reservoir.
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17. A method of operating a power shovel, comprising:
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releasing fluid from a cylinder to allow a dipper door of the power shovel to pivot in a first direction under the force of gravity; accumulating high-pressure fluid discharged from the cylinder during pivoting of the dipper door in the first direction; and directing low-pressure fluid from a reservoir into the cylinder during pivoting of the dipper door in a second direction under the force of gravity. - View Dependent Claims (18, 19, 20)
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Specification