Abstract: This crane is provided with a counterweight which includes an engaging part, a swivel body which is configured to be capable of swiveling, and a fixing unit which is provided on the swivel body, includes an engaged part that can connect with the engaging part, and can adopt a front position and a rear position; in each of the front position and the rear position, the fixing unit and the counterweight are linked by the engaged part being arranged in a position corresponding to that of the engaging part and being connected to the engaging part.

Abstract: The performance information server includes: a request acquisition unit that acquires, from a work machine display operation application operating on a terminal capable of displaying an image including a work machine, a request including a conveyance condition under which the work machine conveys a load; a storage unit that stores specification data of the work machine in mapping with model information of a work machine; a control unit that acquires model information of a work machine having a capability to convey the load under the conveyance condition by referring to the specification data; and a response presentation unit that presents a response including the model information acquired by the control unit to the work machine display operation application.

Abstract: Provided is a guide display device with which it is possible to track a hung load and display guide information. Also provided is a crane including such a guide display device. A guide display device of a crane including a data processing unit that creates a plurality of surfaces using point cloud data, which is acquired by a laser scanner from above a hung load and which includes the hung load, and creates a three-dimensional map according to the plurality of surfaces, the three-dimensional map being created for each prescribed period, wherein the data processing unit is configured to set a reference position at the hung load in the three-dimensional map and also set a current surface present within a prescribed distance from a past reference position as the surface of the hung load, thereby tracking the hung load in the three-dimensional map.

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: To estimate the top surface of a measurement target on the basis of a data point group that corresponds to the top surface of a measurement target and is obtained using a laser scanner. This top surface estimation method for hoisting loads and by acquiring, using the laser scanner, data point groups in a hoisting load region which includes a hoisting load and an object from above the hoisting load and the object, dividing the hoisting load region into layers which constitute a plurality of groups which have a prescribed thickness in the vertical direction, and allocating the acquired data point groups to the plurality of layer groups, and estimating the top surfaces of the hoisting load and the object in each layer group on the basis of the data point groups allocated to the plurality of layer groups.

Abstract: This crane is provided with: a boom; a wire rope suspended down from a leading end section of the boom; a suspender that is fixed to a lower end of the wire rope and is for suspending a slinging tool for hanging a load; a calculation unit that calculates a first load, which is the weight of a member that is suspended down from the suspender; a slinging tool database unit that stores information pertaining to the slinging tool corresponding to the first load; a determination unit that determines whether a load is being suspended from the suspender; and a control unit that acquires the information pertaining to the slinging tool corresponding to the first load from the slinging tool database unit if the load is being suspended, and sets the vertical length of the slinging tool on the basis of the acquired information pertaining to the slinging tool.

Abstract: To accurately present guide information which expresses the shape and height of a hoisting load and an object located near the hoisting load. A guide information display device is equipped with: a data acquisition unit provided with a camera for capturing an image of a hoisting load region which includes at least a hoisting load and the ground surface below the hoisting load from above the hoisting load, and a laser scanner for obtaining a data point group in the hoisting load region; a data processing unit for estimating the top surface of the hoisting weight, the ground surface, and the top surfaces of objects, on the basis of the obtained data point group, and generating guide frames which surround the top surfaces of the hoisting weight and objects; and a data display unit which displays guide information obtained by overlapping the generated guide frames and the captured image with one another.

Abstract: This crane is configured by being provided with: a telescopic boom having an inside boom element and an outside boom element that overlap each other in an extendable and contractible manner; an extension/contraction actuator that displaces one boom element among the inside boom element and the outside boom element in the extending and contracting directions; at least one electric drive source provided in the extension/contraction actuator; a first coupling mechanism that operates on the basis of power from the electric drive source and that switches between the coupled state and the uncoupled state of the extension/contraction actuator and one of the boom elements; and a second coupling mechanism that operates on the basis of power from the electric drive source and that switches between the coupled state and the uncoupled state of the inside boom element and the outside boom element.

Abstract: This control system comprises: a signal processing unit generating a signal related to the target operating amount of an actuator; a feedback control unit that controls the actuator based on the difference between the signal related to the target operating amount and a signal related to the fed-back operating amount; a feed-forward control unit that controls the actuator based on the signal related to the target operating amount in cooperation with the feedback control unit, and learns the characteristics of the actuator by adjusting a weighting factor based on a teacher signal; and a calculation unit that calculates information related to the deflection of the work machine. The signal processing unit corrects intermediate information, which is generated in the process of generating the signal related to the target operating amount, based on the information related to the deflection, and generates the signal related to the target operating amount.

Abstract: To accurately obtain the shapes of a hoisting load and an object located near the hoisting load, and the height of the ground surface, and present an accurate warning display when the hoisting load approaches the object. A guide information display device is equipped with a data processing unit which: estimates the top surface of a hoisting load, the ground surface, and the top surface of the object, on the basis of a data point group obtained by a laser scanner; generates guide frames representing guide frames that surround the top surface of the hoisting load and the top surface of the object, and also generates height information and height information which represent the elevation of the hoisting load and the object; calculates the distance between the hoisting load and the object on the basis of the estimated top surfaces of the hoisting load and object; and outputs a warning display when the distance is equal to or less than a threshold.

Abstract: This power supply circuit for work machine is provided with a first switch for switching connection and disconnection of a first electrical path provided between a battery and a load which is driven with the power of the battery, and a second switch for switching connection and disconnection of a second electrical path bypassing the first switch. The second switch, when the first switch is switched from a state in which the first electrical path is connected to a state in which the first electrical path is disconnected, places the second electrical path in a connected state for a certain period and then, after the period elapses, switches the state in which the second electrical path is connected to a state in which the second electrical path is disconnected.

Abstract: Provided is a crane that is capable of effectively suppressing oscillation related to the pendulum resonance frequency generated in a suspended load on the basis of the suspended length of a wire rope. The crane 1 calculates a suspended load oscillation resonance frequency ?x(n) determined on the basis of the suspended length L(n) of a wire rope (14·16), and generates a control signal C(n) for an actuator according to an arbitrarily defined operation signal, and, on the basis of the resonance frequency ?x(n), generates from the control signal C(n) a filtering control signal Cd(n) for the actuator in which a frequency component in an arbitrarily defined frequency range is attenuated by an arbitrarily defined percentage. The frequency range of the attenuated frequency component and/or the percentage of attenuation is altered on the basis of the suspended length L(n) of the wire rope (14·16).

Abstract: This crane information display system is provided with a terminal device having a camera and captures an image of a crane with the camera to obtain a camera image, said crane information display system comprising: a crane detection unit that detects the orientation of the crane in the camera image; an information processing unit that identifies the position and posture of the crane in the coordinate system of the camera image; a working capacity calculation unit that calculates the working capacity of the crane on the basis of the information relating to the crane inputted to an input unit; and an image display unit that converts the working capacity of the crane into three-dimensional image information corresponding to the position and posture of the crane, overlays the image information on the camera image, and displays the same.

Abstract: A crane information display system includes a terminal device having a camera, and obtains camera images by imaging, with the camera, a first information display unit that displays information. about a crane, the crane information display system including: a crane information acquisition unit that reads, from the camera images, display information of the first information display unit to acquire information about the crane; a virtual crane generation unit that generates a virtual crane image; a position/posture calculation unit that calculates, from the camera images, a position at which the virtual crane is to be disposed and a posture to be taken by the virtual crane; an information processing unit that converts the virtual crane image into an image that corresponds to the position and the posture of the virtual crane; and an image display unit that overlays and displays the virtual crane onto the camera images.

Abstract: This crane information display system is provided with a terminal device having a camera and captures an image of a crane with the camera to obtain a camera image, the crane information display system including a crane information acquisition unit that reads display information of an information display unit, which is mounted in the crane, from the camera image and acquires information about the crane; a position/orientation calculation unit that calculates the position and orientation of the crane from the camera image; an information processing unit that converts the information about the crane acquired by the crane information acquisition unit into three-dimensional image information corresponding to the position and orientation of the crane calculated by the position/orientation calculation unit; and an image display unit that overlays the information about the crane converted by the information processing unit on the camera image and displays the same.

Abstract: The present invention pertains to a control system incorporated in a work machine having an arm section including a boom that is freely raised and lowered, the control system including: an image-capturing unit that is provided at a distal end of the arm section and captures an image of an area below; a display unit that displays an image captured by the image-capturing unit; and a control unit that causes the display unit to display position-related information regarding a position directly below the distal end of the arm section so as to be superimposed on the image.

Abstract: This crane is provided with: a telescopic boom that can be extended; an extension device for extending the telescopic boom; a hydraulic pressure source provided in the extension device; a cylinder connection mechanism connected to the hydraulic pressure source and switching between the states of connection and non-connection with the telescopic boom on the basis of the supply and discharge of hydraulic oil; a first oil path for connecting the hydraulic pressure source and the cylinder connection mechanism; a first valve that is provided on the first oil path and switches the supply and discharge state of the hydraulic oil with respect to the cylinder connection mechanism; and a second oil path that bypasses the first valve and connects the hydraulic pressure source and the cylinder connection mechanism.

Abstract: An image system is for a crane in which a boom that can be raised and lowered is provided to a vehicle with a rotating base therebetween, and said image system is provided with a plurality of vehicle body cameras provided to the vehicle, an upper camera provided to the boom, a display device, and an image processing device.

Abstract: Provided is a crane capable of changing a moment on a counterweight side without changing a total weight of the crane by using a simple method. The crane includes a base, and a swiveling body that is provided above the base so as to swivel about a pivot center, and includes a boom and a counterweight attaching unit. The counterweight attaching unit includes a plurality of attaching positions, and is configured to selectively attach and detach the counterweight to and from any attaching position among the plurality of attaching positions, and the plurality of attaching positions is positions of which distances from the pivot center are different from each other.

Abstract: Provided is a crane (1) comprising: a boom (7) capable of being raised, lowered, and telescoped; a wire rope (8) being suspended from the boom (7); a winch (9) for winding and unwinding the wire rope (8); and a hook (10) being raised and lowered by the winding and unwinding of the wire rope (8). The crane further comprises a spooling operation instrument (24) for enabling commanding an operation state of the winch (9). When the hook (10) is raised to a height at which the hanging length d is a prescribed value by an operation of the spooling operation instrument (24), the boom (7) is raised and extended while the wire rope (8) is unwound such that the prescribed hanging length d is maintained, thereby sustaining the elevation operation of the hook (10).