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US 11,028,862 B2Granted
Metering hydraulic control system for mining machine
AssigneeSandvik Intellectual Property AB
InventorsReinhold Pogatschnigg, Christian Umundum
Life of this patent
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Abstract
A hydraulic system arranged to control at least two hydraulic actuators via a metering control valve assembly. The hydraulic system is advantageous to control a pivoting arm of an undercutting mining machine according to at least two modes of operation including an idling mode and a cutting mode. In particular, the hydraulic actuators may be controlled by quantitative variation of fluid flow speed and pressure.
Claims17
A hydraulic system to control at least two hydraulic actuators, the system comprising:
- a pump;
- a first and a second hydraulic actuator;
- a metering control valve assembly having a plurality of electrohydraulic valves, an inlet fluidly connected to the pump and an outlet fluidly connected to a drain or reservoir, the metering control valve assembly fluidly connected to the first hydraulic actuator;
- and
- a transmission valve assembly having an electronically controllable valve fluidly connected to provide pilot control of a first and a second logic valve, the first and second logic valves being fluidly connected to the metering control valve assembly, wherein the second hydraulic actuator is fluidly connected to the metering control valve assembly via the first and second logic valves.
2 more elements
Dependencies are inferred from the claim text.