Abstract: Provided is a crane capable of allowing an operator to recognize an error in work information or in a number of windings set in a safety device. A main tension of a main wire rope is calculated from a main output torque of a main winch, a sub output torque of a sub winch, a main drum winding radius of the main winch, and a sub drum winding radius of the sub winch. An estimated hanging load, which is calculated from the main tension, a sub tension of a sub wire rope and the number of windings of the wire rope set in a safety device, is compared with an actual hanging load calculated from fluctuating thrust force and boom information. Thus, the suitability of a work kind or a winding number set in the safety device is determined.

Abstract: The unload circuit includes a pump oil passage that connects between a hydraulic pump and a direction control valve, a tank oil passage that connects between the direction control valve and a hydraulic tank, a pressure compensating flow control valve interposed between the pump oil passage and the tank oil passage, a pilot operated relief valve interposed between the pump oil passage and the tank oil passage, and an unloading solenoid valve interposed in a vent oil passage of the pilot operated relief valve. The failure diagnosis device includes a pressure sensor that measures a pressure of the pump oil passage, and a controller that receives a pressure signal from the pressure sensor. The controller performs failure diagnosis of the unload circuit based on a differential pressure between a first pump oil passage pressure during unloading and a second pump oil passage pressure during on-loading.

Abstract: A crane 1, the hook (main hook 24) of which is stored on the lower end of a boom 7, and the winch (main winch 9) of which can be moved by a hydraulic motor 37, said crane being provided with a pressure sensor 55 capable of detecting the pressure of hydraulic fluid being delivered to the hydraulic motor 37, and a controller 61 capable of recognizing changes in the pressure of the hydraulic fluid on the basis of a signal from the pressure sensor 55, and also being provided with an anomaly warning means Mi capable of providing warning of anomalies pertaining to the storage of at least the hook (24), the controller 61 activating the anomaly warning means Mi when it is determined that the pressure of the hydraulic fluid when the hook has been stored is below a minimum value.

Abstract: A crane is disclosed, the crane includes detachable hydraulic cylinder including a head side oil chamber and a rod side oil chamber both to be connected to a control valve through a joint, in which a head side hydraulic detecting section and a rod side hydraulic detecting section are each provided to the hydraulic cylinder, and a connection state between the hydraulic cylinder and the control valve is determined based on a head side hydraulic pressure and a rod side hydraulic pressure in a period until a predetermined time elapses after supply of electric power to the head side hydraulic detecting section and the rod side hydraulic detecting section is started and an operation tool for hydraulic cylinder switches the control valve to a state of supplying hydraulic fluid to the hydraulic cylinder.

Abstract: The present invention is configured so that it is possible to select any one of a first mode in which a first adjustment valve 13 and a second adjustment valve 20 operate solely on the basis of manipulation of a main manipulation tool (turning lever 8i), a second mode in which the first adjustment valve 13 operates solely on the basis of manipulation of the main manipulation tool (8i) and the second adjustment valve 20 operates solely on the basis of manipulation of a secondary manipulation tool (brake pedal 8j), and a third mode in which the first adjustment valve 13 operates solely on the basis of manipulation of the main manipulation tool (8i) and the second adjustment valve 20 operates on the basis of manipulation of the secondary manipulation tool (8j) while operating on the basis of manipulation of the main manipulation tool (8i).

Abstract: A boom-extending wire locking structure has a wire locking tool, provided at a base end side of a first boom member and/or a base end side of a third boom member, that locks an extending wire by winding a lock part of each wire member. The wire locking tool includes: a pair of fixing pieces provided on both sides in an orthogonal direction orthogonal to a boom-extending direction and fixed to the first boom member and/or the third boom member; and wire locking parts, provided between the pair of fixing pieces, including arch-shaped grooves for winding the respective lock parts of the wire members. The wire locking parts are arranged in a central axis direction of the arc shape between the pair of fixing pieces. Central axes of the wire locking parts are arranged at different positions in the orthogonal direction from respective adjacent wire locking parts.

Abstract: This hydraulic system is provided with a hydraulic pump, a control valve, and a pilot pressure supply unit. The pilot pressure supply unit has: an electromagnetic proportional valve that has a detent-type emergency manual operation function with which a pilot oil passage can be opened manually and generates pilot pressure for a control valve; a controller that controls the degree of opening of the electromagnetic proportional valve in accordance with the operation of an operation lever; and a pilot pressure switching unit that switches the oil pressure state of the pilot pressure supply unit between an on-loading state and an unloading state. The pilot pressure switching unit performs control to implement the unloading state when the electromagnetic proportional valve is being opened manually and performs control to implement the on-loading state after the electromagnetic proportional valve has been opened manually.

Abstract: Provided is a jib connection structure capable of connecting a jib base end engagement part and a jib connection shaft even when a boom undergoes natural extension, and capable of restraining a jib from swinging sideways in a state where the jib is projected. This jib connection structure includes: jib connection shafts projecting horizontally toward both sides from a boom tip end part; and jib base end engagement parts respectively provided to bifurcated jib base end parts. Each jib base end engagement part is U-shaped into which the jib connection shaft can be fitted, and is provided with an insertion hole into which a pin for preventing the jib connection shaft from slipping out is inserted. When the jib base end engagement part and jib connection shaft are connected, a gap is formed between the pin and jib connection shaft. When a jib is projected, the gap becomes smaller.

Abstract: There is provided a working machine that includes an operated function unit, an in-vehicle network to be connected to an operation terminal via an external network, an operation unit that transmits an intrinsic operation signal related to operation of the operated function unit to the in-vehicle network, and a control unit that is connected to the operation unit via the in-vehicle network and controls the operated function unit on the basis of either a false operation signal generated by the operation terminal or the intrinsic operation signal.

Abstract: A remote operation terminal T for remotely operating a mobile crane C is configured to include: a mode selection unit 34 for selecting an operation mode corresponding to work of the mobile crane C from a plurality of operation modes; an operation unit 35, 36 for instructing the mobile crane C on operation; and a control unit T1 that, when the operation mode is selected by the mode selection unit 34, assigns the operation corresponding to the selected operation mode to the operation unit 35, 36, and transmits an operation signal from the operation unit 35, 36 to the mobile crane C. Thereby, various operations can be performed by remote operation while securing safety.

Abstract: Provided are a server for maintenance, a remote monitoring system, and a remote monitoring method. The server is connected, via a network, to a plurality of working machines each including a working machine display device that displays machine state information and a working machine operating device to be used for predetermined operation, and to a monitoring terminal that includes a display part and remotely monitors information on the working machines. Communication between each of the plurality of working machines and the server is one-way communication from the working machines to the server. The server includes a first storage part, a second storage part, and a display processing part. The display processing part generates a display part simulated image, and causes the display part of the monitoring terminal to display a maintenance screen including the display part simulated image.

Abstract: An expansion/contraction mechanism includes a telescopic cylinder, boom fixing means, cylinder-boom connecting means, and a hydraulic-pressure supply unit, and telescopes a plurality of booms except a base boom by telescoping the telescopic cylinder. The hydraulic-pressure supply unit includes a pneumatic-pressure source, a selector valve which selects a destination of air provided from the pneumatic-pressure source, a first pneumatic path through which first air sent from the selector valve circulates, a second pneumatic path through which second air sent from the selector valve circulates, a first pneumatic-to-hydraulic conversion unit which converts a pneumatic pressure provided by the first air to a hydraulic pressure and supplies the hydraulic pressure to a first hydraulic cylinder, and a second pneumatic-to-hydraulic conversion unit which converts a pneumatic pressure provided by the second air to a hydraulic pressure and supplies the hydraulic pressure to a second hydraulic cylinder.

Abstract: A compact rough terrain crane in which an exhaust emission control device and an elevating step are laid out in a compact manner without impairing excellent small-radius turning performance is provided. The crane includes a lower carrier that has a front axle and a rear axle. The crane includes an exhaust emission control device that has a DOC which is connected to an exhaust pipe extending from a diesel engine and is supplied with exhaust, a DRT disposed downstream of the DOC, and an SCR disposed downstream of the DRT. The crane includes an elevating step. The DOC, the DRT, and the SCR are disposed in parallel on a virtual horizontal plane that is separated from an upper surface of the lower carrier by a predetermined distance. The step is disposed in a gap that is formed between the upper surface of the lower carrier and the exhaust emission control device.

Abstract: The operating machine boom is an operating machine boom 40 including a tubular boom member 41 configured such that an upper member 42 and a lower member 43 with U-shaped sections are welded together with each upper flat portion 42a butting with a corresponding one of lower flat portions 43a. A welded portion 41b between the upper member 42 and the lower member 43 is on a compression portion B side with respect to a stress neutral point P at a boundary between a compression portion B at which compression stress is caused and a tension portion A at which tensile stress is caused when a load acts downwardly on a tip end side of the boom member 41, and a reinforcement member 44 is arranged on an inner surface side of the welded portion 41 b.

Abstract: A remote operation device capable of providing, to the operator, guidance of a work content to be performed by manual work or remote operation on the work machine in accordance with a state of the work machine, is a remote operation device (40) configured to be capable of communicating with the work machine, and includes: an operation unit (42) that generates an operation signal for performing remote operation of the work machine in accordance with operator's operation; a reception unit (40a) that receives detection signals of detection devices (81 to 84) that detect the state of the work machine; and a display unit (43) that displays a screen indicating a work content to be performed by manual work or the remote operation on the work machine on the basis of the received state of the work machine.

Abstract: Provided is a work vehicle with which crane work maintenance can be carried out efficiently. Device information relating to a work device that performs prescribed work is detected, and it is determined whether or not the device information indicates a management operation state in which a management operation, which is carried out such that an operation corresponding to the prescribed work is performed, is being carried out. When the management operation state is determined to be in effect, engine stopping is restricted even if an engine stopping condition is net.

Abstract: Provided are a work machine and engine stopping control device that make it possible to efficiently perform a setting operation related to crane work. When performing prescribed work, the work mode of a work device can be set, and it is determined whether or not the work device is in a setting state in which this work mode is being set. Due to this, when the work device is determined to be in the setting state, stopping of the engine is restricted even if an idling stop permission condition is met.

Abstract: An anti-theft device of an operational vehicle, in which an operation of cancelling an anti-theft mode is simply and easily performed, is provided. The anti-theft device includes: a travel regulation unit (70) which maintains, when the anti-theft mode is set, the operational vehicle (1) in a state where the operational vehicle (1) cannot travel; and a wireless operation terminal (80) which wirelessly operates an operational device (20). When the wireless operation terminal (80) communicates with a controller (70), the wireless operation terminal (80) performs identification authentication, and when the identification authentication between the wireless operation terminal (80) and the controller (70) is successfully performed, the travel regulation unit (70) cancels the anti-theft mode. Since the wireless operation terminal (80) is only made to communicate with the controller (70), and thus the anti-theft mode is cancelled, the operation of cancelling the anti-theft mode is simply and easily performed.

Abstract: There is provided a small remote control device for an actuator of a mobile crane that can be operated by one hand and with which it is easy to perform operations specific to large cranes, the remote control device being provided with: a device body; a plurality of selectors which are each disposed on an operation surface, and which set the operating direction of the actuator selected by movement in a first direction or a section direction from a neutral position to a forward direction or a reverse direction; and a trigger which moves the actuator selected by the selectors in the forward direction or the reverse direction according to the operation amount. Of the plurality of selectors, the two selectors, which are most frequently used in a work preparation step for the mobile crane are disposed adjacent to the vicinity of the center of the operation surface.

Abstract: A working machines capable of securing safety while enabling remote operation is a working machine configured to be capable of communicating with a remote operation device (40), and includes a communication unit (70a) that receives a manipulate signal from the remote operation device (40), a control unit (70) that controls actuators (51 to 59) mounted in the working machine according to manipulate signals from main operation devices disposed in a cab of the working machine or the remote operation device (40). In a case where a state of the working machine does not fulfill a predetermined condition, the control unit (70) does not allow the remote operation of at least one of the actuators (51 to 59) by the remote operation device (40).