| CPC E02F 9/205 (2013.01) [E02F 9/0833 (2013.01); E02F 9/16 (2013.01); E02F 9/226 (2013.01); E02F 9/2267 (2013.01)] | 4 Claims |
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1. A work machine comprising
an operation room into which a worker gets,
stairs that are able to be switched to an extended state where the stairs allow the worker to get into and out of the operation room or a retracted state where the stairs are retracted so as not to interrupt work,
a hydraulic actuator that is driven by supply of a hydraulic fluid,
a hydraulic-pilot type control valve that controls a flow of the hydraulic fluid supplied to the hydraulic actuator,
a pilot valve that generates a pilot pressure for driving the control valve, by using a pressure from a pilot hydraulic fluid source as a source pressure,
a first pilot line that introduces the hydraulic fluid from the pilot hydraulic fluid source to the pilot valve,
a first gate lock valve disposed on the first pilot line, the first gate lock valve being configured to be switched to either an open position for allowing supply of the hydraulic fluid from the pilot hydraulic fluid source to the pilot valve or a closed position for interrupting the supply of the hydraulic fluid from the pilot hydraulic fluid source to the pilot valve,
a first operation device that is arranged in the operation room and that is used to operate the hydraulic actuator, and
a first gate lock device that is arranged in the operation room and that is used to operate the first gate lock valve,
the work machine being capable of being remotely operated by a remote operation apparatus at a location away from the operation room,
the work machine comprising:
a second pilot line that introduces the hydraulic fluid from the pilot hydraulic fluid source to the pilot valve bypassing the first gate lock valve;
a second gate lock valve disposed on the second pilot line, the second gate lock valve being configured to be switched to either an open position for allowing the supply of the hydraulic fluid from the pilot hydraulic fluid source to the pilot valve or a closed position for interrupting the supply of the hydraulic fluid from the pilot hydraulic fluid source to the pilot valve;
an operation mode selector that is switched manually by the worker to either an operation position for a remote operation mode or an operation position for an in-machine operation mode, the remote operation mode representing a mode for a remote operation by the remote operation apparatus, the in-machine operation mode representing a mode for an operation by the worker who is in the operation room;
a selector valve disposed on the second pilot line, the selector valve being configured to be switched, by the switching operation of the operation mode selector, to either an open position for allowing the supply of the hydraulic fluid from the pilot hydraulic fluid source to the pilot valve or a closed position for interrupting the supply of the hydraulic fluid from the pilot hydraulic fluid source to the pilot valve; and
a controller that controls an opening of the pilot valve according to a first remote operation signal transmitted by the remote operation apparatus and that controls the second gate lock valve such that the second gate lock valve is caused to be at either the open position or the closed position on a basis of a second remote operation signal transmitted by the remote operation apparatus, the remote operation apparatus including a second operation device that outputs the first remote operation signal for remotely operating the hydraulic actuator and a second gate lock device that outputs the second remote operation signal for giving an instruction for enabling or disabling of the remote operation by the second operation device, wherein
in a state where the first gate lock valve has been switched to the closed position, the second gate lock valve is allowed to be controlled by the controller when the stairs are in the retracted state and is kept at the closed position irrespective of the second remote operation signal when the stairs are in the extended state.
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