A hydraulic excavator includes: a revolving frame; a work implement including a first actuator and a second actuator; a control valve; and a first pipe through which hydraulic oil flows between the control valve and each of the first actuator and the second actuator. The first pipe includes: a first conduit connected to the control valve; a second conduit and a third conduit that are connected to the first actuator and the second actuator, respectively; and a first branch portion at which the first conduit branches into the second conduit and the third conduit. A first region and a second region are on one side and the other side respectively with respect to the virtual straight line passing through a center of swing of the revolving frame. In the first region, a work implement is disposed. In the second region, the control valve and the first branch portion are disposed.

A work machine includes: control valves that control flows of a hydraulic operating oil supplied to actuators; operation lever devices that generate hydraulic signals to be output to the corresponding control valves according to an operation; solenoid proportional valves that reduce pressure of the hydraulic signals generated by the corresponding operation lever devices; and a front implement control section that controls the solenoid proportional valves. The work machine further includes: operation signal lines connected to the operation lever devices; signal input lines connected to the control valves; pressure reducing lines provided with the solenoid proportional valves; and selector valves that have a first position that interrupts connection of the operation signal lines and the pressure reducing lines and directly connects the operation signal lines to the signal input lines, and a second position that connects the operation signal lines to the signal input lines via the pressure reducing lines.

A shovel includes at least one of an orientation information obtaining apparatus configured to obtain information related to an orientation state of the shovel, a movement information obtaining apparatus configured to obtain information related to a movement state of the shovel, and an input information obtaining apparatus configured to obtain information related to an input state from an operator into the shovel. Further, the shovel includes a memory, and a processor coupled to the memory and configured to obtain information related to a predetermined movement of the shovel based on an output from at least one of the orientation information obtaining apparatus, the movement information obtaining apparatus, and the input information obtaining apparatus, and detect the predetermined movement or transmit the information related to the predetermined movement to an external apparatus.

A work machine includes a plurality of actuators that drive a work device; a posture sensor that senses postural data about the work device; and a controller having a degree-of-proximity calculating section that computes a degree of proximity that is an index value indicating proximity between an intrusion prohibition region and the work device on the basis of positional data about the intrusion prohibition region and the postural data. A command section executes, when the proximity specified by the degree of proximity is closer than proximity specified by a degree-of-proximity threshold, operating area limiting control to decelerate at least one of the plurality of actuators such that an intrusion of the work device into the intrusion prohibition region is prevented. History of the data about the degree of proximity calculated at the degree-of-proximity calculating section is stored and the degree-of-proximity threshold is altered on the basis of the history data.

A display device for an excavator, includes a communication device, a display, an audio acquiring device configured to collect audio inside a cabin of the excavator, and a converter configured to convert the audio collected by the audio acquiring device into character information. The display displays, in time series, transmission information transmitted from an external terminal and received by the communication device, and the character information output from the converter.

A hydraulic tool with a protective box assembly including a control circuit and hydraulic pressure sensors is used to operate a prime mover. The control circuit and the hydraulic pressure sensors are used to monitor performance of the hydraulic tool. Systems and methods implemented in a cloud monitor the performance of the hydraulic tool. The systems and methods utilize data collected by the hydraulic pressure sensors, processed by the control circuit, and transmitted via an antenna from the hydraulic tool to the cloud. A first set of systems and methods detect and predict a jam condition in blades associated with the hydraulic tool using statistical analysis of the data. A second set of systems and methods detect faults associated with the hydraulic tool including hydraulic leakage, mechanical wear, and friction.

The present invention pertains to a method for estimating a payload of a hydraulic mining shovel comprising an attachment having a bucket and at least one hydraulic cylinder. The method comprising the steps of determining a current position of the bucket, measuring a cylinder pressure and an angular attachment acceleration, estimating a dynamic cylinder pressure based on the angular attachment acceleration, calculating an estimated static cylinder pressure and retrieving a payload estimation. The present invention also pertains to a hydraulic mining shovel comprising a system being configured to carry out such method.

A low idling controller (26A) switches an idling state flag from “clear” to “set” upon detecting a non-operation of an operating device (14). A rotational speed controller (26B) switches a rotational speed command from a set rotational speed by a rotational speed command device (27) to a low idling rotational speed based upon the idling state flag. At this time, an engine (8) drives in the low idling rotational speed lower than the set rotational speed. A gate controller (24) stops switching of an inverter (23) while the low idling controller (26A) is lowering a rotational speed of the engine (8).

A control system includes: an engine; a first hydraulic pump and a second hydraulic pump driven by the engine; a switching device provided in a flow path that connects the first hydraulic pump to the second hydraulic pump, and configured to perform switching between a merged state in which the flow path is opened and a separated state in which the flow path is closed; a first hydraulic actuator to which hydraulic fluid discharged from the first hydraulic pump is supplied in the separated state; a second hydraulic actuator to which hydraulic fluid discharged from the second hydraulic pump is supplied in the separated state; a determining unit configured to determine whether output of the engine is limited; and a merging-separating control unit configured to control the switching device so as to perform switching to the merged state when the determining unit determines that output of the engine is limited.

An excavator includes a lower traveling body; an upper turning body turnably mounted to the lower traveling body; an actuator configured to change an orientation of the upper turning body; and a control apparatus configured to perform front-face control to operate the actuator such that the upper turning body is caused to front-face a target surface, based on information regarding the target surface and information regarding the orientation of the upper turning body, wherein the control apparatus performs the front-face control such that the upper turning body maintains a state of front-facing the target surface.