Hitachi Construction Machinery Co., Ltd.

Hisashi Tago

Takenori Hiroki

Hironori Itou

Daiki Machida

Tomoya Murazumi

Naoki Hagiwara

Gen Yasuda

Taiki Aizawa

Junya Matsumoto

Kouhei Hashimoto

Ryou Takaichi

A work machine includes: a machine body; an actuator attached to the machine body; an operation device used to operate the actuator; an operation sensor that senses an operation of the operation device; a photographing device that photographs surroundings of the machine body; a video data recording device that records video data including video photographed by the photographing device; a controller that controls the video data recording device; and an object sensor that senses an object in the surroundings of the machine body. The controller determines whether or not a recording and retaining condition including a condition that an object is present in the surroundings of the machine body and a condition that the operation device is operated is satisfied on the basis of a result of sensing in the object sensor and a result of sensing in the operation sensor, and makes the video data recording device record and retain the video data when the recording and retaining condition is satisfied.

Work machine for determining condition for recording and retaining video

A plus-side main connection line () connects electrical equipment (), () to a plus terminal (A) of a battery (). A plus-side isolating switch () is provided in the plus-side main connection line () to connect or disconnect the electrical equipment (), () and or from the plus terminal (A) of the battery (). A plus-side auxiliary connection line () connects a urea SCR controller () to the plus terminal (A) of the battery () in a position upstream of the plus-side isolating switch (). A minus-side main connection line () connects a minus terminal (B) of the battery () to ground. A minus-side isolating switch () is provided in the minus-side main connection line () to connect or disconnect the minus terminal (B) of the battery () and or from ground.

Construction machine

A plus-side main connection line () connects electrical equipment (), () to a plus terminal (A) of a battery (). A plus-side isolating switch () is provided in the plus-side main connection line () to connect or disconnect the electrical equipment (), () and or from the plus terminal (A) of the battery (). A plus-side auxiliary connection line () connects a communication terminal () to the plus terminal (A) of the battery () in a position upstream of the plus-side isolating switch (). A minus-side main connection line () connects a minus terminal (B) of the battery () to ground. A minus-side isolating switch () is provided in the minus-side main connection line () to connect or disconnect the minus terminal (B) of the battery () and or from the ground.

A reduction in measurement accuracy of a concentration sensor is minimized. An exhaust gas purifying device of a work machine includes a reduction catalyst that is placed in an exhaust flow passage of an exhaust gas of an engine and uses a reducing agent to reduce and purify nitrogen oxides in the exhaust gas, and a reducing agent injector to inject the reducing agent into the exhaust flow passage. The exhaust gas purifying device of a work machine includes: a storage unit that stores the reducing agent; a concentration sensor that has a sensing part placed within the storage unit to detect a concentration of the reducing agent; an air-bubble removal device that injects the reducing agent toward the sensing part; and a reducing agent pump that supplies the reducing agent in the storage unit to the air-bubble removal device.

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Kashiwa, Japan

Hisashi Tago