Abstract: An information acquisition system includes a first input acquisition unit that acquires masses of the attachment and the suspended cargo as first input, a second input acquisition unit that acquires information about a posture of the attachment as second input, a position estimation unit that estimates the position of at least one of the attachment and the suspended cargo, based on the first input and the second input, and an information derivation unit that derives information about the possibility of interference between the external object and at least one of the attachment and the suspended cargo, based on the position of at least one of the attachment and the suspended cargo estimated by the position estimation unit.

Abstract: A simulator is provided which can reduce a standby time of a construction machine, enable a process plan for construction machine work to be executed, and enable an unskilled operator to improve work efficiency of a construction machine.

Abstract: The present invention provides a work machine in which load shaking of a crane in emergency can be prevented. In the work machine, a turning body is disposed to be turnable relative to a base body. The work machine includes a drive control unit which controls a turning operation of the turning body, and a detection unit which detects an obstacle present around the turning body. The drive control unit does not start turning of the turning body in a case where the obstacle is detected by the detection unit while the turning of the turning body is stopped, and maintains the turning of the turning body for at least a predetermined period in a case where the obstacle is detected by the detection unit during the turning of the turning body.

Abstract: Components of a jig are suppressed from coming into contact with a pin hole when a coupling pin is removed from the pin hole, and a length of the jig in a coupling pin axial direction is held down. A coupling pin attaching/detaching apparatus (a coupling pin extracting apparatus) includes a cylinder and a connection member. The cylinder is arranged outside a coupling pin in a radial direction of the coupling pin and is extensible. The connection member is connected to the coupling pin and the cylinder. Extension of the cylinder causes the coupling pin to be extracted from a pin hole via the connection member.

Abstract: Components of a jig are suppressed from coming into contact with a pin hole when a coupling pin is removed from the pin hole, and a length of the jig in a coupling pin axial direction is held down. A coupling pin attaching/detaching apparatus (a coupling pin extracting apparatus) includes a cylinder and a connection member. The cylinder is arranged outside a coupling pin in a radial direction of the coupling pin and is extensible. The connection member is connected to the coupling pin and the cylinder. Extension of the cylinder causes the coupling pin to be extracted from a pin hole via the connection member.