Abstract: A damage estimation device includes: an operation parameter reception unit that acquires an operation parameter related to an operation of a work machine; a damage estimation model storage unit that stores a damage estimation model constructed by machine learning using training data with the operation parameter as an input value and a damage parameter related to damage in a predetermined portion of the work machine as an output value; and a damage parameter estimation unit that estimates the damage parameter by inputting the operation parameter acquired by the operation parameter reception unit to the damage estimation model stored in the damage estimation model storage unit.

Abstract: Provided is a valve restrained from unintentional close. The valve includes a valve element formed with a flow-path hole, a holding member having inlet and outlet ports and holding the valve element while permitting its rotational movement in first and second directions, and a rotational restriction section. The valve element has an open position for making communication between the ports through the flow-path hole and a close position for blocking between the ports. The rotational restriction section restricts the rotational movement so as to stop the rotational movement thereof in the first direction at the open position where a specific part of the outer peripheral surface of the valve element overlaps the inlet port and receives pressure of the liquid to allow the pressure to impart a rotational bias in the first direction to the valve element in the open position.

Abstract: Provided is a valve restrained from unintentional close. The valve includes a valve element formed with a flow-path hole, a holding member having inlet and outlet ports and holding the valve element while permitting its rotational movement in first and second directions, and a rotational restriction section. The valve element has an open position for making communication between the ports through the flow-path hole and a close position for blocking between the ports. The rotational restriction section restricts the rotational movement so as to stop the rotational movement thereof in the first direction at the open position where a specific part of the outer peripheral surface of the valve element overlaps the inlet port and receives pressure of the liquid to allow the pressure to impart a rotational bias in the first direction to the valve element in the open position.

Abstract: A valve capable of restraining a valve element having a flow-path hole from unintentional rotation to close the valve is provided midway of a flow pipe, including the valve element and a holding member holding the valve element while permitting rotational movement thereof and having inlet and outlet ports. The valve element makes rotational movement between a first position for bringing the ports into communication with each other through the flow-path hole and a second position for blocking the communication. The flow-path hole has inlet and outlet openings facing respective inlet and outlet ports, in the first position. The inlet opening has a shape capable of embracing an outer edge of a valve-element-side opening of the inlet port facing the valve element and a size greater than that of the outer edge of the valve-element-side opening circumstantially of the rotational movement of the valve element.

Abstract: A working machine includes a base machine and a working attachment. The working attachment has a base-end boom, a lead-end boom, and an arm. The working machine is collapsible into a triple-folded state, with the base-end boom being located on the upper side and the arm being located on the lower side with respect to the lead-end boom, as a posture of the working machine for transport. The working machine further includes a lead-end boom cylinder for moving the lead-end boom, and an arm cylinder for moving the arm. The lead-end boom has a first lead-end boom cylinder attachment portion for mounting the lead-end boom cylinder, and a first arm cylinder attachment portion for mounting the arm cylinder. The first lead-end boom cylinder attachment portion is disposed at a position different from the first arm cylinder attachment portion in a widthwise direction of the working attachment, and lower than the first arm cylinder attachment portion in the transport posture.

Abstract: A working machine includes a base machine and a working attachment. The working attachment has a base-end boom, a lead-end boom, and an arm. The working machine is collapsible into a triple-folded state, with the base-end boom being located on the upper side and the arm being located on the lower side with respect to the lead-end boom, as a posture of the working machine for transport. The working machine further includes a lead-end boom cylinder for moving the lead-end boom, and an arm cylinder for moving the arm. The lead-end boom has a first lead-end boom cylinder attachment portion for mounting the lead-end boom cylinder, and a first arm cylinder attachment portion for mounting the arm cylinder. The first lead-end boom cylinder attachment portion is disposed at a position different from the first arm cylinder attachment portion in a widthwise direction of the working attachment, and lower than the first arm cylinder attachment portion in the transport posture.