Hitachi Construction Machinery Co., Ltd.

Tadashi Nishizawa

Hidefumi Ishimoto

Teppei Saitoh

Ryu Narikawa

Kouji Fujita

Hideaki Itou

Hiroshi Sakamoto

Takuya Naka

Provided is a work machine that allows assisting a loading work without giving uncomfortable feeling to an operator. The control deviceof the work machineincludes an allowable range calculation sectionthat calculates an allowable range indicating a range in which the front work deviceis movable in a height direction allowed in a swing operation; an operation determining sectionthat determines whether the work machineis under a convey operation; and an operation control sectionthat controls a turn operation of a boomsuch that the position of the front work devicein the height direction remains within the allowable range when the work machineis determined to be under the convey operation.

Work machine

A work machine includes a second pilot line that introduces a hydraulic fluid from a pilot hydraulic fluid source to a pilot valve bypassing a first gate lock valve, a second gate lock valve that is disposed on the second pilot line and that is configured to be switched to an open position for allowing the supply of the hydraulic fluid to the pilot valve or a closed position for interrupting the supply of the hydraulic fluid, and a controller that controls the second gate lock valve on the basis of a second remote operation signal transmitted from a remote operation apparatus and that controls the pilot valve according to a first remote operation signal transmitted from the remote operation apparatus. In a state where the first gate lock valve is at a closed position, the second gate lock valve is allowed to be controlled by the controller when stairs are in a retracted state, and is kept at the closed position irrespective of the second remote operation signal when the stairs are in an extended state.

Work efficiency is improved while necessary and sufficient monitoring on the surroundings of a working machine is performed. A working machine includes an undercarriageon which an upperstructureincluding a front working device is mounted in a swingable manner, and includes a surrounding monitoring devicethat monitors surroundings. The surrounding monitoring devicehas an information controllerthat: sets a working region by use of terrain data and work states received from sensors detecting work states of the front working device of the working machine; calculates proximity for each of the obstacles around the working machine by use of the working regions and relative positions of each of obstacles and the working machine, the obstacles being detected by an obstacle sensor that detects obstacles around the working machine; and outputs a control instruction in accordance with the proximity.

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Tokyo, Japan

Tadashi Nishizawa