Hitachi Construction Machinery Patente

The construction machine includes a flow control valve as a hydraulic equipment that adjusts the flow rate supplied to the hydraulic cylinder for driving the work implement, and a controller that controls the hydraulic cylinder to meet the condition that the work tool does not move beyond the target surface. The controller calculates the target speed of the hydraulic cylinder such that the work tool meets the condition, based on the detection information of the detection device that detects the posture of the work implement and the information of the target surface. Then, if the target value of the hydraulic equipment corresponding to the calculated target speed is smaller than the lower limit value that can ensure the accuracy of flow rate control, the controller recalculates the target speed of the hydraulic cylinder such that the work tool meets the condition based on the limit speed of the hydraulic cylinder obtained from the lower limit value, and controls the hydraulic equipment by the target value corresponding to the recalculated target speed.

A shut-off lever that restricts the operation of the operation lever device, a camera that captures the surroundings of the vehicle body, a monitor that displays the camera image captured by the camera, a monitor operation device that instructs the enlargement of the display magnification of the camera image, and a controller that controls the display of the monitor according to the operation of the monitor operation device are provided. The controller that controls the display enlarges the camera image displayed on the monitor according to the display magnification instructed by the monitor operation device when the operation of the operation lever device is restricted by the shut-off lever. Even if the enlargement of the display magnification is instructed by the monitor operation device, when the restriction of the operation of the operation lever device by the shut-off lever is released, the camera image is displayed on the monitor at a predetermined display magnification, providing construction machinery. This suppresses the operator's oversight of obstacles during operation.

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When the control lever is not operated, the discharge pressure of the main pump can be maintained at a pressure above a predetermined minimum pressure. Additionally, when the control lever is operated, it ensures that sufficient flow rate of pressure oil is supplied to the hydraulic actuator of the directional control valve, which is tandem-connected downstream of the bypass cut valve placed in the middle of the center bypass oil passage. Therefore, a bypass cut valve is placed between the first directional control valve and the second directional control valve in the center bypass oil passage. The controller maintains the opening area of the bypass cut valve at a predetermined minimum opening area when all the directional control valves are in the neutral position, and controls the discharge flow rate of the main pump such that the discharge pressure of the main pump is at a pressure equal to or greater than a predetermined minimum discharge pressure. Then, when the second directional control valve, located downstream of the bypass cut-off valve, is operated, the controller controls the increase in the opening area of the bypass cut-off valve as the spool stroke amount of the second directional control valve increases.

Provided is a work machine capable of achieving significant increases and decreases in engine rotational speed and easy fine adjustment thereof. The work machine includes: a power device that drives rotation; a work device that operates using the power device as a power source; and an instruction device that instructs an increase and a decrease in rotational speed of the power device. The instruction device includes a first instruction device and a second instruction device. A minimum change unit of the rotational speed of the power device that can be instructed by the first instruction device is different from a minimum change unit of the rotational speed of the power device that can be instructed by the second instruction device.

Provided are an operation device and a work machine provided with the same, the operation device being capable of instantly adjusting an audio player sound volume even when the audio player sound volume sounds quite or loud as a result of adjusting an engine speed during audio playback, or capable of instantly adjusting an air conditioner air volume even when it is desired to suppress engine power loss or to improve fuel efficiency by reducing an air volume of an air conditioner as a result of adjusting an engine speed during operation of the air conditioner. In the operation device in which an engine speed adjustment function and an audio player sound volume adjustment function are exclusively assigned to a rotation operation of a dial, in a state in which the engine speed adjustment function is assigned to the rotation operation of the dial, the assignment of the rotation operation of the dial is switched to the audio player sound volume adjustment function by tilting the dial in one direction. In a state where the audio player sound volume adjustment function is assigned to the rotation operation of the dial, the assignment of the rotation operation of the dial is switched to the engine speed adjustment function by tilting the dial in a direction opposite to that when the assignment of the rotation operation of the dial is switched from the engine speed adjustment function to the audio player sound volume adjustment function.

For example, in a work machine equipped with an input device that can selectively assign plurality functions, provide a work machine that can present information indicating the current function assignment without misidentifying the assigned functions and without reducing the visibility of other display information during operation. In a work machine equipped with an input device that can selectively assign any of plurality functions, and a display that shows either a first display screen containing the current function assignment information of the input device or a second display screen that does not contain the current function assignment information of the input device, the controller, when the first display screen is shown on the display and the input device is operated, executes processing according to the current function assignment of the input device. When the second display screen is shown on the display and the input device is operated, it does not execute processing according to the current function assignment of the input device, but instead controls the display to switch the display screen from the second display screen to the first display screen.

The work machine includes a vehicle body, a camera for capturing the surroundings of the vehicle body, a monitor for displaying the camera image photographed by the camera, a monitor operation device for instructing changes in the display magnification of the camera image displayed on the monitor, and a controller for controlling the display of the monitor in response to the operation of the monitor operation device. The controller notifies the operator of caution or disables the change in display magnification instructed by the monitor operation device when the display magnification instructed by the monitor operation device is outside the predetermined magnification range and predetermined operating conditions are met before the operation of the vehicle body. This suppresses the deficiency of the area displayed on the monitor relative to the proper display target area during operation.

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The battery device (26) mounted on the vehicle body frame (5) is composed of a multi-stage battery frame (27) having vertically stacked first support frame body (28), second support frame body (29), third support frame body (30), fourth support frame body (31), and a plurality of battery modules (35) that are detachably attached to each of these first support frame body (28), second support frame body (29), third support frame body (30), fourth support frame body (31).

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The battery (25) mounted on the vehicle body frame (5) is positioned at the front side part of the vehicle body frame (5), and the DC/DC converter (29) is located between the front wheel (3) and the rear wheel (4) and is positioned on the lateral side of the vehicle body frame (5). The boost reactor (26) is positioned on the rear side of the battery (25) in a state facing the battery (25) in the longitudinal direction, the hydraulic pump drive motor (27) is positioned on the rear side of the boost reactor (26), and the pump drive inverter (28) is positioned on the rear side of the hydraulic pump drive motor (27).

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The dump truck (1) includes a vehicle body frame (5) to which front wheels (3) and rear wheels (4) are attached, an travel electric motor (25) driving the rear wheels (4), a battery device (26) mounted on the vehicle body frame (5) supplying electric power to the travel electric motor (25), and electrical equipment including a converter (34) arranged on the rear side of the battery device (26). The battery device (26) is configured to include a battery frame (27) supported by the vehicle body frame (5) and a battery module (33) attached to the battery frame (27). The battery frame (27) is formed with a refrigerant pipe housing section (32) housing a first refrigerant pipe (45) through which refrigerant cooling the battery module (33) flows, and a second refrigerant pipe (50) through which refrigerant cooling the electrical equipment flows.

The present invention aims to provide a hydraulic drive system capable of improving the operability of a hydraulic actuator by suppressing shock when switching from the state where the hydraulic pump accumulates in the accumulator to the state where the hydraulic pump drives the hydraulic actuator. Therefore, when the detection value of the first pressure sensor falls below a predetermined first threshold without an operation signal being input, the controller communicates the hydraulic pump to the accumulator while interrupting the hydraulic pump and hydraulic actuator and interrupting the hydraulic pump and tank. When an operation signal is input while pressure oil is being supplied from the hydraulic pump to the accumulator, the controller reduces the opening of the accumulator flow control valve and communicates the hydraulic pump to the tank while interrupting the hydraulic pump and the hydraulic actuator. Then, after a predetermined time has elapsed or after the pressure of the hydraulic pump has decreased, the controller communicates the hydraulic pump and the hydraulic actuator.

The vehicle body frame (2) consists of a left frame (2A) and a right frame (2B) extending in the longitudinal direction, a left pillar (2C) extending upwards from the left frame (2A), a right pillar (2D) extending upwards from the right frame (2B), and a beam (2E) extending in the lateral direction and attached across the upper parts of the left pillar (2C) and the right pillar (2D). The battery device (11) is arranged between the left pillar (2C) and the right pillar (2D) with a plurality of battery modules (12). In the plurality of battery modules (12), one end side in the longitudinal direction becomes the electrical wiring connection part (12A) for connecting electrical wirings (15), and the other end side in the longitudinal direction becomes the temperature control liquid pipe connection part (12B) for connecting temperature control liquid pipes (16).

The dump truck (1) is equipped with a vehicle body frame (5) to which front wheels (3) and rear wheels (4) are attached, an electric motor (25) to drive the rear wheels (4), a battery device (26) mounted on the vehicle body frame (5) to supply power to the electric motor (25), and electrical device including a converter (34) arranged on the rear side of the battery device (26) . Below the battery device (26), a first refrigerant line (45) through which refrigerant flows to cool the battery device (26) and a second refrigerant line (54) through which refrigerant flows to cool the electrical device are arranged.

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A work machine includes a body (1, 2) and a front work implement (3) equipped with a bucket (7), and the front work implement includes a thumb attachment (8) that cooperates with the bucket to hold an object. The work machine includes a hydraulic pump (19, 20), a bucket cylinder (11), a thumb cylinder (12), a bucket operation device (14), a bucket directional control valve (21), a thumb attachment operation device (15), a thumb attachment directional control valve (22), and a controller (13). The controller controls the thumb attachment directional control valve so that the operation of the thumb attachment is linked to the operation of the bucket only while the operation signal of the bucket is being input by the bucket operation device, when the automatic mode in which the operation of the thumb attachment is automatically controlled is set.

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To provide a work machine that can efficiently perform loading work by appropriately positioning the hauling vehicle relative to the work machine. The work machine of the present invention includes a loading preparation support device, which is a controller that supports loading preparation until a hauling vehicle approaches the work machine for loading from the work machine to the hauling vehicle based on the position information of the work machine and the hauling vehicle, and an actuator control device that controls the operation of the work machine's actuator according to commands from the loading preparation support device. The loading preparation support device includes a loadable range calculation section that calculates the loadable range as information indicating the range where the hauling vehicle should stop during loading based on the movable range of the work machine, and a loading possibility determination section that determines the possibility of loading to the hauling vehicle based on the information of the loading portion of the hauling vehicle moved from the standby position based on the loadable range, and the loadable range. The loading possibility determination section determines that loading to the hauling vehicle is possible if the loading portion of the hauling vehicle is included in the loadable range. Then, the work machine starts the loading work to the hauling vehicle by controlling the operation of the actuator with the actuator control device when it is determined that loading to the hauling vehicle is possible.

The present invention has an object to provide an electrically driven construction machine capable of downsizing a hydrogen tank which stores a fuel for a fuel cell and a heat exchanger which releases heat of a coolant for the fuel cell. Thus, in a hydraulic excavator including a machine body, an electrically driven motor which is a power source for the machine body, a fuel cell which generates electric power, and an electric power controller which controls electric power supplied to the electrically driven motor, the hydraulic excavator includes an external electric power receiver which receives electric power from a commercial electric power supply device, and the electric power controller controls electric power supplied from the fuel cell and the external electric power receiver to the electrically driven motor.

A standard value is computed from the cumulative number of replaced components and an operation index; a load factor is computed on the basis of a ratio between a value computed for each customer category from the cumulative number of replaced components and the operation index used for computing the standard value, and the standard value; a future operation time is estimated for each machine from an operation history; a maintenance timing of a component is computed for each customer category from the maintenance history and the ratio; a maintenance time to reach the computed maintenance timing of the component is estimated from the future operation time and the maintenance timing of the component; and an inspection time is created on the basis of the estimated maintenance time. Accordingly, it is possible to automatically and more accurately create an inspection plan of a machine with high inspection efficiency at an appropriate timing in consideration of the influence of a load caused by a way of using a machine by a customer.

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