JP2023125756A - Electric shovel, and series of shovel - Google Patents

Abstract

To improve safety.SOLUTION: An electric shovel has: an upper swinging body; a motor mounted on the upper swinging body; a battery mounted on the upper swinging body in order to supply power to the motor; a cabin mounted on the upper swinging body; an openable/closable door provided on the cabin; and a charging port capable of being connected to a charging mechanism for supplying power to the battery from an outside power source, wherein the charging port is provided at a position lower than a bottom side part of the door out of a surface where the door of the upper swinging body is provided.SELECTED DRAWING: Figure 4

Description

The present disclosure relates to an electric excavator and a series of excavators.

In recent years, electrically driven excavators have been proposed that have an electric motor that operates a hydraulic drive system. In the electrically driven excavator, an electric motor is driven by electric power supplied from a battery provided in the main body.

Electrically driven excavators are provided with a charging port for charging a battery. In the technology described in Patent Document 1, a battery is mounted at the rear of an excavator, and a charging port is installed above the battery. Opening the rear cover of the excavator reveals the charging port.

Japanese Patent Application Publication No. 2020-45701

However, in the technology described in Patent Document 1, since the charging port is provided at the back of the excavator, it is difficult for the operator riding the excavator to confirm whether or not the charging cable is connected to the charging port. It's difficult.

Therefore, in view of the above problems, it is an object of the present invention to improve safety by making it easier to confirm whether or not a charging connector is connected to a charging port.

In order to achieve the above object, an electric excavator according to an embodiment of the present disclosure includes an upper revolving structure, an electric motor mounted on the upper revolving structure, and a motor mounted on the upper revolving structure to supply electric power to the electric motor. the battery, a cabin mounted on the upper revolving body, a door provided in the cabin that can be opened and closed, and a charging port connectable to a charging mechanism that supplies power to the battery from an external power source, The charging port is provided at a position lower than the bottom of the door on the surface of the revolving upper structure where the door is provided.

According to the above-described embodiment, safety is improved by making it easy to confirm whether or not the charging connector is connected to the charging port when boarding the cabin.

FIG. 1 is a side view showing a shovel (excavator) according to an embodiment. FIG. 2 is a block diagram schematically showing an example of the configuration of the shovel according to the embodiment. FIG. 3 is a top view showing an example of the arrangement structure of various devices of the revolving upper structure according to the embodiment. FIG. 4 is a diagram showing the appearance of the excavator according to the embodiment. FIG. 5 is an explanatory diagram showing the difference between the shovel according to the embodiment and an engine-type shovel. FIG. 6 is a diagram showing the arrangement of each component in the interior space when the outer flap is opened according to the embodiment.

Embodiments of the present invention will be described below with reference to the drawings. Further, the embodiments described below are illustrative rather than limiting the invention, and all features and combinations thereof described in the embodiments are not necessarily essential to the invention. Note that in each drawing, the same or corresponding configurations are denoted by the same or corresponding symbols, and explanations may be omitted.

(First embodiment)
First, an overview of an excavator 200 according to a first embodiment will be described as an example of an electric excavator.

[Excavator overview]
As shown in FIG. 1, an excavator 200 according to the present embodiment includes a lower traveling body 1, an upper rotating body 3 that is rotatably mounted on the lower traveling body 1 via a rotating mechanism 2, and a boom as an attachment. 4, an arm 5, a bucket 6, and a cabin 10.

The lower traveling body 1 includes, for example, a pair of left and right crawlers, and each of the crawlers is hydraulically driven by traveling hydraulic motors 1R and 1L (see FIG. 2), so that the lower traveling body 1 moves by itself.

The upper rotating body 3 is hydraulically driven by a rotating hydraulic motor 2M (see FIG. 2) through the rotating mechanism 2, so that the upper rotating body 3 rotates with respect to the lower traveling body 1. All driven elements (for example, the swing hydraulic motor 2M) are hydraulically driven by hydraulic oil supplied from the main pump 14 (see FIG. 2). This corresponds to a configuration in which the power source (engine) of a so-called hydraulic excavator is replaced with a pump electric motor 12.

Further, the upper revolving body 3 may be electrically driven by a swing electric motor driven by electric power supplied from the battery module 19 through the swing mechanism 2 instead of the swing hydraulic motor 2M. In this case, for example, the shovel 200 is connected from the battery module 19 to the swing electric motor via the power converter 100 and the inverter. The electric motor for swinging may perform a power running operation in which the upper rotating structure 3 is driven to swing under the control of the shovel controller 30 and an inverter, and a regenerative operation in which regenerative power is generated to swing and brake the upper rotating structure 3. . Further, the swing electric motor may supply regenerated power to the battery module 19 and the pump electric motor 12 via an inverter.

The boom 4 is attached to the center of the front part of the upper revolving body 3 so that it can be lifted up and down, an arm 5 is attached to the tip of the boom 4 so that it can move up and down, and a bucket 6 is attached to the tip of the arm 5 so that it can be moved up and down. Can be installed. The boom 4, arm 5, and bucket 6 are hydraulically driven by a boom cylinder 7, an arm cylinder 8, and a bucket cylinder 9 as hydraulic actuators, respectively.

The bucket 6 is an example of an end attachment, and other end attachments may be attached to the tip of the arm 5 instead of the bucket 6 depending on the content of the work. The other end attachment may be a different type of bucket from the bucket 6, such as a slope bucket or a dredging bucket. Further, the other end attachment may be a different type of end attachment from the bucket, such as a breaker, an agitator, or a grapple.

The cabin 10 is mounted on the front left side of the upper revolving structure 3, and is provided with a cockpit seat for an operator, an operating device 26 (see FIG. 2), etc. to be described later.

A rotatable door 10A is provided on the left side of the cabin 10. The door 10A is provided with hinges (rotation shafts) 10B and 10C on the long side of the rear side. The door 10A is rotatable approximately 180 degrees in the rearward direction DB with reference to the hinges (rotation shafts) 10B and 10C.

An outer flap 150 (an example of an outer cover member) is provided approximately at the center of the left side surface of the upper revolving body 3. The outer flap 150 can be opened and closed, and a charging vehicle inlet (an example of a charging port) for charging the excavator 200 is provided in the space inside the outer flap 150 when the outer flap 150 is opened. The charging vehicle inlet will be described later.

The excavator 200 operates driven elements such as the lower traveling body 1 (left and right crawlers), the upper rotating body 3, the boom 4, the arm 5, and the bucket 6 in response to operations by an operator riding in the cabin 10.

Further, instead of being configured to be operable by an operator riding in the cabin 10, or in addition, the shovel 200 may be configured to be remotely operated from outside the shovel 200. When the excavator 200 is remotely controlled, the interior of the cabin 10 may be unmanned. The following description will proceed on the premise that the operator's operations include at least one of an operator's operation on the operating device 26 by an operator in the cabin 10 and a remote control by an external operator.

The remote control includes, for example, a mode in which the shovel 200 is operated by an operation input regarding an actuator of the shovel 200 performed by a predetermined external device. In this case, the excavator 200 may be equipped with a communication device (not shown) capable of communicating with a predetermined external device, and may, for example, transmit image information (captured image) output by an imaging device (not shown) to the external device. . Then, the external device may display the received image information (captured image) on a display device (hereinafter referred to as a "remote control display device") provided in the external device. Further, various information images (information screens) displayed on the output device 50 (display device) inside the cabin 10 of the excavator 200 may be similarly displayed on a remote control display device of an external device. As a result, the operator of the external device can, for example, remotely operate the shovel 200 while checking the display contents such as a captured image showing the surroundings of the shovel 200 or an information screen displayed on the remote control display device. can. Then, the excavator 200 operates the hydraulic actuator in response to a remote control signal indicating the content of the remote control received from an external device through the communication device, and operates the lower traveling structure 1 (left and right crawlers), the upper rotating structure 3, Driven elements such as boom 4, arm 5, and bucket 6 may be driven.

Further, the remote control may include, for example, a mode in which the shovel 200 is operated by external voice input or gesture input to the shovel 200 by a person (for example, a worker) around the shovel 200. Specifically, the excavator 200 receives sounds uttered by surrounding workers etc. through an audio input device (for example, a microphone) or a gesture input device (for example, an imaging device) mounted on the excavator 200 (its own machine). Recognize gestures, etc. performed by employees, workers, etc. Then, the excavator 200 operates the actuator according to the content of the recognized voice, gesture, etc., and moves the undercarriage 1 (left and right crawlers), the upper revolving structure 3, the boom 4, the arm 5, the bucket 6, etc. The drive element may also be driven.

Furthermore, the excavator 200 may automatically operate the actuator regardless of the details of the operator's operation. As a result, the excavator 200 has a function (so-called " ``Autonomous driving function'' or ``machine control function'').

The automatic operation function includes a function that automatically operates driven elements (actuators) other than the driven element (hydraulic actuator) to be operated in response to the operator's operation on the operating device 26 or remote control (so-called "semi-automatic operation function"). ”) may be included. In addition, the automatic operation function includes a function that automatically operates at least a part of multiple driven elements (actuators) on the premise that there is no operator operation on the operating device 26 or remote control (so-called "fully automatic operation function"). may be included. In the excavator 200, when the fully automatic operation function is enabled, the interior of the cabin 10 may be unmanned. Further, the semi-automatic driving function, fully automatic driving function, etc. may include a mode in which the operation details of a driven element (actuator) that is a target of automatic driving are automatically determined according to predefined rules. In addition, for semi-automatic driving functions, fully automatic driving functions, etc., the excavator 200 autonomously makes various judgments, and based on the judgment results, autonomously determines the operation of the driven element (actuator) that is the target of automatic driving. (so-called "autonomous driving function") may be included.

[Shovel configuration]
Next, the configuration of the shovel 200 according to the present embodiment will be described with reference to FIG. 2 in addition to FIG. 1.

FIG. 2 is a block diagram schematically showing an example of the configuration of the shovel 200 according to the present embodiment.

In FIG. 2, the mechanical power line is shown as a double line, the hydraulic line is shown as a thick solid line, the pilot line is shown as a broken line, and the electric drive/control line is shown as a thin solid line.

<Hydraulic drive system>
The hydraulic drive system of the excavator 200 according to the present embodiment includes traveling hydraulic motors 1R and 1L, a swing hydraulic motor 2M, which hydraulically drives driven elements such as the lower traveling body 1, the boom 4, the arm 5, and the bucket 6, respectively. It includes hydraulic actuators such as a boom cylinder 7, an arm cylinder 8, and a bucket cylinder 9. Further, the hydraulic drive system of the excavator 200 according to the present embodiment includes a pump electric motor 12, a main pump 14, and a control valve 17.

The pump electric motor 12 (an example of an electric motor) is a power source for a hydraulic drive system. The pump electric motor 12 is, for example, an IPM (Interior Permanent Magnet) motor. The pump electric motor 12 is connected to a high voltage power source including a battery module 19 and a power conversion device 100 via an inverter 18 . The pump electric motor 12 is powered by three-phase AC power supplied from the battery module 19 via the inverter 18 to drive the main pump 14 and the pilot pump 15 . Drive control of the pump electric motor 12 may be performed by an inverter 18 under the control of a shovel controller 30, which will be described later.

The main pump 14 supplies hydraulic oil to the control valve 17 through the high-pressure hydraulic line 16 by sucking hydraulic oil from the hydraulic oil tank T and discharging it to the high-pressure hydraulic line 16 . The main pump 14 is driven by the pump electric motor 12. The main pump 14 is, for example, a variable displacement hydraulic pump, and a regulator (not shown) controls the angle (tilting angle) of the swash plate under the control of a shovel controller 30, which will be described later. Thereby, the main pump 14 can adjust the stroke length of the piston and adjust the discharge flow rate (discharge pressure).

Note that the main pump 14 may be driven by power from another power source in addition to the pump electric motor 12. For example, when the boom 4 is lowered or the arm 5 is closed, the energy of the hydraulic oil discharged from the boom cylinder 7 or arm cylinder 8 into the hydraulic oil tank is regenerated by the weight of the boom 4 or arm 5, and the main pump 14 is activated. It may be driven. Specifically, when the boom 4 is lowered or the arm 5 is closed, the energy of the hydraulic oil discharged from the boom cylinder 7 and arm cylinder 8 into the hydraulic oil tank due to the weight of the boom 4 and arm 5 is used to increase the main pump 14. A hydraulic motor disposed coaxially with the rotation axis of the motor may be driven. Also, when the boom 4 is lowered or the arm 5 is closed, the energy of the hydraulic oil discharged from the boom cylinder 7 and arm cylinder 8 into the hydraulic oil tank is regenerated by the weight of the boom 4 and arm 5, and the energy is used to generate electricity in the generator. may be performed. Specifically, when the boom 4 is lowered or the arm 5 is closed, the energy of the hydraulic oil discharged from the boom cylinder 7 and arm cylinder 8 into the hydraulic oil tank due to the weight of the boom 4 and arm 5 is used to generate electricity and power from the generator. The generator may generate electricity by driving a coaxially arranged hydraulic motor. In this case, the power generated by the generator may be supplied to the pump motor 12 or charged to the battery module 19.

The control valve 17 is a hydraulic control device that controls the hydraulic drive system in response to an operator's operation or an operation command corresponding to an automatic driving function. As described above, the control valve 17 is connected to the main pump 14 via the high-pressure hydraulic line 16, and supplies the hydraulic oil supplied from the main pump 14 to the hydraulic actuators (travel hydraulic motors 1R, 1L, swing hydraulic motor 2M, boom cylinder 7, arm cylinder 8, and bucket cylinder 9). For example, the control valve 17 is a valve unit that includes a plurality of control valves (direction switching valves) that control the flow rate and flow direction of the hydraulic oil supplied from the main pump 14 to each of the hydraulic actuators. Hydraulic oil supplied from the main pump 14 and passed through the control valve 17 and the hydraulic actuator is discharged from the control valve 17 to the hydraulic oil tank T.

<Electric drive system>
The electric drive system of excavator 200 according to this embodiment includes a pump motor 12, a sensor 12s, and an inverter 18. Further, the electric drive system of the excavator 200 according to the present embodiment includes a high-voltage power source configured by a battery module 19, a power conversion device 100, and the like.

The sensor 12s includes a current sensor 12s1, a voltage sensor 12s2, and a rotation state sensor 12s3.

The current sensor 12s1 detects the current of each of the three phases (U phase, V phase, and W phase) of the pump motor 12. The current sensor 12s1 is provided, for example, in a power path between the pump motor 12 and the inverter 18. Detection signals corresponding to the currents of each of the three phases of the pump motor 12 detected by the current sensor 12s1 are directly taken into the inverter 18 through the communication line. Further, the detection signal may be taken into the shovel controller 30 through the communication line and input to the inverter 18 via the shovel controller 30.

The voltage sensor 12s2 detects the voltage applied to each of the three phases of the pump motor 12. The voltage sensor 12s2 is provided, for example, in a power path between the pump motor 12 and the inverter 18. Detection signals corresponding to the voltages applied to each of the three phases of the pump motor 12 detected by the voltage sensor 12s2 are directly taken into the inverter 18 through the communication line. Further, the detection signal may be taken into the shovel controller 30 through the communication line and input to the inverter 18 via the shovel controller 30.

The rotation state sensor 12s3 detects the rotation state (eg, rotation position (rotation angle), rotation speed, etc.) of the pump electric motor 12. The rotation state sensor 12s3 is, for example, a rotary encoder or a resolver.

The inverter 18 drives and controls the pump electric motor 12 under the control of the shovel controller 30. The inverter 18 includes, for example, a conversion circuit that converts DC power into three-phase AC power or converts three-phase AC power into DC power, a drive circuit that drives a switch of the conversion circuit, and the operation of the drive circuit. and a control circuit that outputs a control signal (for example, a PWM (Pulse Width Modulation) signal).

The control circuit of the inverter 18 controls the drive of the pump motor 12 while grasping the operating state of the pump motor 12. For example, the control circuit of the inverter 18 grasps the operating state of the pump motor 12 based on the detection signal of the rotation state sensor 12s3. Further, the control circuit of the inverter 18 sequentially controls the rotation angle of the rotation shaft of the pump motor 12 based on the detection signal of the current sensor 12s1 and the detection signal of the voltage sensor 12s2 (or the voltage command value generated in the control process). By estimating, the operating state of the pump motor 12 may be grasped.

Note that at least one of the drive circuit and control circuit of the inverter 18 may be provided outside the inverter 18.

The battery module 19 is configured to supply charged power to electronic components within the excavator 200. The specific configuration will be described later.

The power conversion device 100 boosts the power of the battery module 19 or steps down the power from the pump motor 12 via the inverter 18 to cause the battery module 19 to store the power. The power converter 100 switches between a voltage boost operation and a voltage drop operation according to the operating state of the pump motor 12 so that the voltage value of the DC (Direct Current) bus 110 falls within a certain range. Switching control between the step-up operation and the step-down operation of the power converter 100 is executed by the excavator controller 30 based on the detected voltage value of the DC bus 110, the detected voltage value of the battery module 19, and the detected current value of the battery module 19, for example. It's okay to be.

Note that if there is no need to boost the output voltage of the battery module 19 and apply it to the pump motor 12, the power converter 100 may be omitted.

<Operation system>
The operating system of excavator 200 according to this embodiment includes a pilot pump 15, an operating device 26, and a pressure control valve 31.

Pilot pump 15 supplies pilot pressure to various hydraulic devices (for example, pressure control valve 31) mounted on excavator 200 via pilot line 25. Thereby, the pressure control valve 31 can supply pilot pressure to the control valve 17 according to the operation details (eg, operation amount and operation direction) of the operating device 26 under the control of the shovel controller 30. Therefore, the shovel controller 30 and the pressure control valve 31 can realize the operation of the driven element (hydraulic actuator) according to the operator's operation on the operating device 26. Furthermore, under the control of the shovel controller 30, the pressure control valve 31 can supply a pilot pressure to the control valve 17 according to the content of the remote control specified by the remote control signal. The pilot pump 15 is, for example, a fixed capacity hydraulic pump, and is driven by the pump electric motor 12 as described above.

The operating device 26 is provided within the reach of the operator in the cockpit of the cabin 10, and allows the operator to control the respective driven elements (i.e., the left and right crawlers of the undercarriage 1, the upper revolving structure 3, the boom 4, and the arm 5). , bucket 6, etc.). In other words, the operating device 26 is a hydraulic actuator (for example, travel hydraulic motors 1R, 1L, swing hydraulic motor 2M, boom cylinder 7, arm cylinder 8, bucket cylinder 9, etc.) by which an operator drives each driven element. It is used to operate electric actuators. The operating device 26 is, for example, an electric type, and outputs an electrical signal (hereinafter referred to as an "operating signal") according to the content of an operation by an operator. The operation signal output from the operation device 26 is taken into the shovel controller 30 via the signal line 28. As a result, the shovel controller 30 can control the pressure control valve 31 and control the operation of the driven elements (actuators) of the shovel 200 in accordance with the operator's operation details and operation commands corresponding to the automatic operation function. can.

The operating device 26 includes, for example, levers 26A to 26C. The lever 26A may be configured to be able to accept operations regarding each of the arm 5 (arm cylinder 8) and the upper rotating body 3 (swinging operation), for example, in response to operations in the front-rear direction and left-right direction. The lever 26B may be configured to be able to accept operations regarding each of the boom 4 (boom cylinder 7) and the bucket 6 (bucket cylinder 9), for example, in response to operations in the front-rear direction and left-right direction. The lever 26C may be configured to be able to accept an operation of the lower traveling body 1 (crawler), for example.

Note that when the control valve 17 is composed of an electromagnetic pilot type control valve (directional switching valve), the operation signal of the electric operating device 26 is directly input to the control valve 17, and each hydraulic control valve is configured as an operating device. 26 may be adopted. Further, the operating device 26 may be of a hydraulic pilot type that outputs a pilot pressure depending on the content of the operation. In this case, pilot pressure depending on the operation content is supplied to the control valve 17.

The pressure control valve 31 uses hydraulic oil supplied from the pilot pump 15 through the pilot line 25 under the control of the shovel controller 30 to output a predetermined pilot pressure. A pilot line on the secondary side of the pressure control valve 31 is connected to the control valve 17 , and the pilot pressure output from the pressure control valve 31 is supplied to the control valve 17 .

<Power system>
The excavator 200 includes a vehicle inlet 101 for normal charging and a vehicle inlet 102 for quick charging as a configuration for charging the battery module 19.

The normal charging vehicle inlet 101 is configured to be connectable to a charging connector (an example of a charging member) provided at the tip of a predetermined cable of an external power source (hereinafter referred to as a "charging cable").

The charging AC-DC converter 103 converts AC power supplied from an external power source via the normal charging vehicle inlet 101 into DC power capable of charging the battery 192, and supplies the DC power to the battery module 19.

The rapid charging vehicle inlet 102 is configured to be connectable to a charging connector (an example of a charging member) provided at the tip of a charging cable of an external power source (for example, a charging station). The vehicle inlet 102 for quick charging is, for example, an inlet for performing quick charging based on CHAdeMO (registered trademark). In this embodiment, by using such a DC charging method, DC power can be supplied to the battery module 19 without going through an AC-DC converter.

This embodiment uses a charging connector provided at the tip of a charging cable as a charging member connected to a vehicle inlet 101 for normal charging (an example of a charging port) and a vehicle inlet 102 for quick charging (an example of a charging port). An example of direct connection will be explained.

The battery module 19 of the excavator 200 according to this embodiment supplies power to each component within the excavator 200. Battery module 19 includes a battery 192 and a battery controller 191.

Battery 192 supplies power to various components within excavator 200. For example, the battery 192 supplies charged (stored) power to the pump electric motor 12. Further, the battery 192 is charged with the power generated by the pump motor 12 (regenerated power).

The battery 192 is charged (accumulated) by being connected to an external power source via a charging cable.

Battery 192 is, for example, a lithium ion battery and has a relatively high output voltage (eg, several hundred volts).

Battery controller 191 controls the internal configuration of battery module 19 . For example, the battery controller 191 monitors the temperature status of the battery 192 based on the output result from a temperature sensor (not shown), and calculates the SOC (State of Charge) of the battery 192. Then, the battery controller 191 outputs the detection result of the temperature sensor and the SOC to the shovel controller 30. Thereby, the shovel controller 30 can display the temperature of the battery 192 and the SOC of the battery 192 on the output device 50 (display device) inside the cabin 10.

The battery controller 191 according to the present embodiment determines whether or not the charging connector is connected to the vehicle inlet 101 for normal charging or the vehicle inlet 102 for quick charging, depending on whether the charging connector is connected to the vehicle inlet 101 for normal charging or the vehicle inlet 102 for quick charging. . Note that the present embodiment does not limit the method of determining whether or not power can be supplied to the determination according to whether or not the charging connector is connected. For example, when performing wireless power supply, other methods may be used, such as determining whether or not power supply is possible through mutual communication with a charging facility provided with an external power source.

Then, when it is determined that the battery controller 191 is connected to an external power source (for example, a charging station) using a charging cable and a charging connector (in other words, when it is determined that power can be supplied), the battery controller 191 connects the external power source (for example, a charging station) Communicate with charging equipment equipped with When the battery controller 191 communicates with the charging equipment and is permitted to supply power from the charging equipment, power supply from an external power source is started.

<Control system>
The control system of shovel 200 according to this embodiment includes a shovel controller 30, an output device 50, and an input device 52.

The output device 50 is provided in the cabin 10 and outputs various information to the operator under the control of the shovel controller 30. The output device 50 includes, for example, a display device that outputs (notifies) information to the operator in a visual manner. The display device may be installed, for example, at a location within the cabin 10 that is easily visible to the operator, and may display various information images under the control of the shovel controller 30. The display device is, for example, a liquid crystal display or an organic EL (Electroluminescence) display. Further, the output device 50 includes, for example, a sound output device that outputs information to the operator in an auditory manner. The sound output device is, for example, a buzzer, a speaker, or the like.

The input device 52 is provided within the cabin 10 and receives various inputs from the operator. The input device 52 may include, for example, an operation input device that accepts an operation input from an operator. The operation input device includes, for example, a button, a toggle, a lever, a touch panel, a touch pad, and the like. Further, the input device 52 may include, for example, a voice input device that accepts voice input from an operator and a gesture input device that accepts gesture input from the operator. The voice input device includes, for example, a microphone that captures the voice of the operator inside the cabin 10. Further, the gesture input device includes, for example, an indoor camera that can capture an image of the operator's gesture inside the cabin 10. A signal corresponding to an input from the operator accepted by the input device 52 is taken into the shovel controller 30.

Each function of the shovel controller 30 may be realized by arbitrary hardware or a combination of arbitrary hardware and software. For example, the shovel controller 30 each includes a processor such as a CPU (Central Processing Unit), a memory device (main storage device) such as a RAM (Random Access Memory), a nonvolatile auxiliary storage device such as a ROM (Read Only Memory), The computer may be configured mainly with a computer including an interface device for input/output with the outside, and the like.

The shovel controller 30 performs drive control of the shovel 200. For example, the shovel controller 30 outputs a control command to the pressure control valve 31 in response to an operation signal input from the operating device 26, and causes the pressure control valve 31 to output a pilot pressure according to the operation content of the operating device 26. . Thereby, the shovel controller 30 can realize the operation of the driven element (hydraulic actuator) of the shovel 200 corresponding to the operation content of the electric operating device 26.

Further, when the shovel 200 is remotely controlled, the shovel controller 30 may perform control related to the remote control, for example. Specifically, the shovel controller 30 may output a control command to the pressure control valve 31 and cause the pressure control valve 31 to output a pilot pressure according to the content of the remote control. Thereby, the shovel controller 30 can realize the operation of the shovel 200 (driven element) corresponding to the content of the remote control.

Further, the shovel controller 30 may perform control related to automatic driving functions, for example. Specifically, the shovel controller 30 may output a control command to the pressure control valve 31 and cause the pressure control valve 31 to act on the control valve 17 with a pilot pressure according to the operation command corresponding to the automatic operation function. Thereby, the shovel controller 30 can realize the operation of the driven element (hydraulic actuator) of the shovel 200 that corresponds to the automatic operation function.

The shovel controller 30 may integrally control the operation of the entire shovel 200 (various devices mounted on the shovel 200).

The shovel controller 30 performs drive control of the electric drive system based on various input information (for example, control commands including operation signals of the operating device 26, etc.). Further, lighting control of the indicator 160 may be performed based on a signal from the battery controller 191.

Further, the shovel controller 30 drives the power converter 100 based on the operating state of the operating device 26, for example, and controls the voltage step-up operation and step-down operation of the power converter 100, in other words, the discharge state and charging state of the battery module 19. You may perform switching control with Further, for example, when the shovel 200 is remotely controlled, the shovel controller 30 may drive the power conversion device 100 and control switching between the discharging state and the charging state of the battery module 19 based on the details of the remote control. . Further, for example, when the automatic operation function of the excavator 200 is enabled, the shovel controller 30 drives the power conversion device 100 based on an operation command corresponding to the automatic operation function, and changes the discharge state and charge state of the battery module 19. Switching control may be performed.

<Location of equipment installed on the upper revolving structure>
FIG. 3 is a top view showing an example of the arrangement structure of various devices in the upper revolving structure 3. As shown in FIG. In FIG. 3, the house portion, which is the exterior of the revolving upper structure 3, is omitted in order to expose various devices of the revolving upper structure 3.

The upper revolving body 3 according to the present embodiment is configured such that the rear portion thereof has a substantially arc shape with the rotation center (axis center) 3X as the center when viewed from above. Thereby, the turning radius of the rear part of the upper revolving body 3 can be made relatively small. The turning radius of the rear part of the revolving upper structure 3 means the radius of the trajectory (outer edge) drawn by the rear part of the revolving upper structure 3 around the turning center 3X when the revolving upper structure 3 turns. The shovel 200 corresponds to, for example, a rear micro-swing type shovel. The term "excavator with very small rear swing" refers to an excavator in which the ratio of the turning radius of the rear part of the upper revolving structure 3 to half (1/2) of the total width of the crawler 1C is within 120%. Thereby, the excavator 200 can improve workability in a narrow work site.

On the other hand, in the case of the rear micro-swing type excavator, the space at the rear (in the -X direction) of the upper revolving body 3, especially the space at the left and right (Y-axis direction) ends, is reduced and becomes relatively small. In addition, as there is a trend toward electrification, especially in small machines, the space at the rear of the upper revolving structure 3 is limited in the electric excavator 200, even if it is not an excavator with an ultra-small rear swing. and tends to be relatively small. Therefore, if a relatively large component is placed at the rear of the revolving upper structure 3, dead space will increase, and an efficient arrangement structure of the components may not be realized.

Therefore, in this embodiment, the battery module 19, which is one of the largest components mounted on the revolving upper structure 3, is arranged at the front right side (-Y direction side) of the revolving upper structure 3. The right front portion has a substantially rectangular parallelepiped shape. The battery module 19 is formed in a shape corresponding to the front right side. The pump electric motor 12 and the main pump 14 are mounted at the rear of the upper revolving structure 3.

As a result, in the excavator 200, the pump motor 12, the main pump 14, etc., which are relatively small in size, are arranged at the rear of the revolving upper structure 3, so that the dead space can be made relatively small. The excavator 200 secures a relatively large installation space for the battery module 19 along the right side of the upper revolving structure 3, where the horizontal position changes are small in the front-rear direction (X-axis direction) when viewed from above. can do. Therefore, the excavator 200 can realize an efficient arrangement structure of the components of the revolving upper structure 3 including the battery module 19.

A pump electric motor 12, a main pump 14, a pilot pump 15, and a control valve 17 are located in the rear part of the upper revolving body 3, from the center in the left-right direction (Y-axis direction) to the right end (-Y-direction side end). , and an inverter 18 are provided.

The pump electric motor 12 and the inverter 18 are integrally arranged at the center of the rear part of the upper revolving body 3 in the left-right direction (Y-axis direction). The pump electric motor 12 and the inverter 18 are arranged such that the rotation axis of the pump electric motor 12 runs along the left-right direction (Y-axis direction) and the output shaft extends rightward. For example, the pump electric motor 12 is mounted on the bottom 3B (swivel frame) of the upper revolving structure 3 via a mount member. Specifically, the pump electric motor 12 may be placed relatively close to the bottom portion 3B so that the main pump 14 and pilot pump 15, which are connected in a mechanically drivable manner, are positioned as low as possible. . Thereby, the main pump 14 can be positioned lower than the liquid level inside the hydraulic oil tank T. Therefore, the occurrence of air trapping in the main pump 14 can be suppressed.

The main pump 14 and the pilot pump 15 are arranged adjacent to the right side of the pump motor 12 such that their input shafts are connected to the output shaft of the pump motor 12 . The main pump 14 and the pilot pump 15 are mounted on the bottom portion 3B via the pump motor 12, for example, by being connected to the pump motor 12.

The control valve 17 is disposed at the center of the rear part of the revolving upper structure 3 in the left-right direction (Y-axis direction) and above the pump electric motor 12 . For example, the pump electric motor 12 and the main pump 14 are arranged at a relatively low position in the space between the bottom part 3B of the upper revolving body 3 and the house part, and the control valve 17 is arranged at a relatively high position in the space. will be placed in Specifically, a pedestal 17MT provided so as to straddle the pump electric motor 12 in the front-rear direction (X-axis direction) is attached to the bottom portion 3B. The control valve 17 is mounted on the pedestal 17MT, thereby being mounted on the bottom portion 3B via the pedestal 17MT.

Note that the control valve 17 may be placed above the main pump 14 or the pilot pump. Moreover, the control valve 17 may be arranged so as to straddle between the pump electric motor 12 and the main pump 14 or pilot pump 15 in the left-right direction (Y-axis direction).

A swing hydraulic motor 2M is mounted in the center of the upper revolving body 3.

A hydraulic oil tank T is arranged in a space in the longitudinal direction (X-axis direction) between the swing hydraulic motor 2M, the pump electric motor 12, and the control valve 17. The hydraulic oil tank T is mounted on the bottom portion 3B directly or via a bracket or the like.

A vehicle inlet 101 for normal charging and a vehicle inlet 102 for quick charging are provided on the left side (+Y direction side) of the cabin 10 of the upper revolving structure 3 . The vehicle inlet 101 for normal charging and the vehicle inlet 102 for quick charging are arranged side by side in the front-rear direction (X-axis direction), for example. Further, inside the cabin 10, a charging AC-DC converter 103 is arranged.

The vehicle inlet 101 for normal charging (an example of a charging port) can be connected to a charging connector. The rapid charging vehicle inlet 102 (an example of a charging port) can be connected to a charging connector.

A cable 154 (an example of a power line) connects the vehicle inlet 101 for normal charging (an example of a charging port) and the AC-DC converter 103 for charging. Since the cable 154 is connected without detouring between the vehicle inlet 101 for normal charging and the AC-DC converter 103 for charging, the length of the cable 154 is suppressed.

Furthermore, the charging AC-DC converter 103 and the battery module 19 are connected by a cable 155 (an example of a power line). Since the cable 155 is connected to the charging AC-DC converter 103 and the battery module 19 without making a detour, the length of the cable 155 is suppressed.

Further, the quick charging vehicle inlet 102 and the battery module 19 are connected by a cable 156 (an example of a power line). Since the cable 156 connects the rapid charging vehicle inlet 102 and the battery module 19 in a substantially straight line, the cable 156 is prevented from becoming long.

In this embodiment, the path for supplying power between the vehicle inlet 101 for normal charging or the vehicle inlet 102 for quick charging and the battery module 19 is connected to be shortened by cables 154, 155, and 156. Therefore, cable costs can be reduced and noise generation can be suppressed.

As shown in FIG. 3, an openable and closable outer flap 150 is provided on the left side of the upper revolving body 3. A first inner flap 151 that covers the vehicle inlet 101 for normal charging and a second inner flap 152 that covers the vehicle inlet 102 for quick charging are provided in the interior space 153 when the outer flap 150 is opened.

The first inner flap 151 and the second inner flap can be opened and closed. For example, when connecting the charging connector to the vehicle inlet 101 for normal charging, the first inner flap 151 is left open. Furthermore, when connecting the charging connector to the vehicle inlet 102 for quick charging, the second inner flap 152 is kept open.

Next, the reason why the vehicle inlet 101 for normal charging and the vehicle inlet 102 for quick charging are arranged on the left side of the cabin 10 of the upper revolving structure 3 will be explained.

FIG. 4 is a diagram showing the appearance of the shovel 200 according to this embodiment. FIG. 4(A) is a front view of the shovel 200, and FIG. 4(B) is a perspective view of the shovel 200 according to the present embodiment.

The example shown in FIG. 4 shows a situation where the shovel 200 is being charged. Specifically, a situation is shown in which the charging connector 400 is connected to the normal charging vehicle inlet 101 or the quick charging vehicle inlet 102 stored inside the outer flap 150 with the outer flap 150 opened. ing. Charging connector 400 is connected to an external power source via charging cable 401.

For example, when the charging connector 400 is used for rapid charging, the weight is about 1 to 1.5 kg. If the charging cable 401 is for quick charging, it is conceivable to use a 100 kW class cable. Such a 100kw class cable has a thickness of about 70sq. Therefore, charging cable 401 naturally becomes heavier. Therefore, the burden on the operator who attaches and detaches the charging connector 400 also increases. In addition, the excavator 200 requires frequent charging, such as multiple times a day, in order to perform work.

That is, it is preferable that the vehicle inlet 101 for normal charging or the vehicle inlet 102 for quick charging be provided at a position where it can be easily connected to the charging connector 400.

Therefore, in the excavator 200 according to the present embodiment, the vehicle inlet 101 for normal charging and the vehicle inlet 102 for quick charging are installed from the bottom part of the door 10A among the side surfaces of the upper revolving structure 3 where the door 10A is provided. It is installed in a low position.

If the vehicle inlet for normal charging or the vehicle inlet for quick charging is provided above the excavator, it takes effort to lift the charging connector. Therefore, in this embodiment, by providing the normal charging vehicle inlet 101 or the quick charging vehicle inlet 102 at a position lower than the bottom of the door 10A of the excavator 200, the operator can easily connect the charging connector 400. This makes it easier, which reduces the workload.

By the way, instead of providing the vehicle inlet 101 for normal charging and the vehicle inlet 102 for quick charging at a position lower than the bottom of the door 10A of the excavator 200 as in the present embodiment, the vehicle inlet for charging is installed behind the door of the cabin. It is also conceivable to provide a However, the door of an excavator is often provided so as to be able to rotate rearward, and may rotate 180 degrees. In other words, when the vehicle charging inlet is provided behind the cabin door, if the excavator door is rotated during charging, the door and the charging connector may come into contact with each other.

Therefore, in this embodiment, a normal charging vehicle inlet 101 and a quick charging vehicle inlet 102 are provided at a position lower than the bottom of the door 10A of the excavator 200. Therefore, even if the door 10A is rotated while the charging connector 400 is connected to the vehicle inlet 101 for normal charging or the vehicle inlet 102 for quick charging, the door 10A and the charging connector 400 are connected to each other. , can be prevented from coming into contact with each other. Thereby, it is possible to suppress problems caused by contact between the door 10A and the charging connector 400, and improve safety.

Furthermore, in an electrically driven excavator such as excavator 200, it takes time to charge the battery module 19. Therefore, after connecting the charging connector 400 to a vehicle inlet for normal charging or a vehicle inlet for quick charging, a worker (a person who performs charging work, for example, an operator) often leaves the excavator 200. . When the operator gets on the shovel 200 to start work, the operator may have forgotten that the charging connector 400 was connected to the shovel 200 because some time has passed since charging started. Furthermore, the operator who rides the excavator 200 and the worker who connected the charging connector 400 to the vehicle inlet for normal charging or the vehicle inlet for quick charging may be different. In many cases, it is not assumed that the shovel 200 will perform work in a situation where the charging connector 400 is connected to the shovel 200, and it is not preferable that the operator cannot grasp the situation in which the shovel 200 is connected to the charging connector 400.

Therefore, in the excavator 200 according to the present embodiment, the vehicle inlet 101 for normal charging and the vehicle inlet 102 for quick charging are provided on the left side surface of the cabin 10 where the door 10A is provided. That is, since the vehicle inlet 101 for normal charging and the vehicle inlet 102 for quick charging are provided on the same side as the cabin 10, when the operator gets into the cabin 10, the vehicle inlet 101 for normal charging or the vehicle inlet 102 for quick charging It can be visually confirmed whether the charging connector 400 (an example of a charging mechanism) is connected to the charging connector 400 (an example of a charging mechanism).

In this embodiment, an example in which a normal charging vehicle inlet 101 and a quick charging vehicle inlet 102 are provided on the left side surface of the upper revolving structure 3 is described. This is because, as shown in FIG. 3, the cabin 10 is installed in a position that is biased to the left with respect to the rotation center (axis center) 3X of the upper revolving body 3, and a door is provided on the left side of the cabin 10. This is because 10A is provided. That is, the vehicle inlet 101 for normal charging and the vehicle inlet 102 for quick charging are provided on the left side surface of the upper revolving structure 3 so that they can be easily confirmed by a worker who enters and exits through the door 10A. However, this embodiment is not limited to an example in which the vehicle inlet 101 for normal charging and the vehicle inlet 102 for quick charging are provided on the left side of the cabin 10. For example, in a cabin provided in an upper revolving structure, when a worker can get on and off from both sides, a normal charging vehicle inlet 101 and a quick charging vehicle inlet 102 are connected to one of the two sides. It may be provided. As another example, the cabin 10 is provided in a position biased to the right side with respect to the rotation center (axis center) 3X of the upper revolving body 3, and the door 10A is provided on the right side of the cabin 10. In this case, a normal charging vehicle inlet 101 and a quick charging vehicle inlet 102 may be provided on the right side of the upper revolving structure 3. In this way, the normal charging vehicle inlet 101 and the quick charging vehicle inlet 102 are provided based on the position where the door through which the worker can enter and exit the cabin 10 is provided.

As described above, in the excavator 200, charging the battery module 19 takes time. Therefore, after a worker (for example, an operator) connects the charging connector 400 to the vehicle inlet 101 for normal charging and the vehicle inlet 102 for quick charging, the worker may wait at a seat in the cabin 10 until charging is completed. .

If a charging vehicle inlet is provided directly under the cabin door, there is a possibility that the charging connector connected to the charging vehicle inlet or the charging cable of the charging connector may obstruct workers from boarding the cabin. be. Further, a part of the worker's body may come into contact with the charging connector or the charging cable of the charging connector. In this case, there is a possibility that the charging connector comes off from the charging vehicle inlet.

Therefore, in the excavator 200 according to the present embodiment, the normal charging vehicle inlet 101 and the quick charging vehicle inlet 102 are located near the door 10A and on the side surface of the upper revolving structure 3 where the cabin 10 is provided. It is located behind the center of the bottom of the Accordingly, when the operator opens the door 10A, the charging connector 400 and the charging cable 401 are arranged so as to avoid the vicinity of the center of the opened area, making it easier for the operator to get into the cabin 10.

The door 10A of the cabin 10 is rotatable in the rearward direction of the excavator 200 with reference to the hinges 10B and 10C. The holding member 13 provided on the side surface of the shovel 200 holds the protruding member 10E provided on the door 10A of the cabin 10, so that the door 10A can be fixed to the side surface. In this way, the door 10A of the cabin 10 can be fixed to the side surface of the upper revolving body 3. In other words, the door 10A of the cabin 10 can be fixed while being rotated approximately 180 degrees. That is, when the door 10A of the cabin 10 rotates rearward and is fixed to the side surface of the upper revolving structure 3, the rear side surface can be confirmed from the cabin 10.

Therefore, when the door 10A is fixed to the side surface of the upper revolving structure 3, the operator is obstructed by the door 10A when checking the normal charging vehicle inlet 101 and the quick charging vehicle inlet 102 from inside the cabin 10. It can be confirmed whether or not the charging connector 400 is connected to the vehicle inlet 101 for normal charging or the vehicle inlet 102 for quick charging. As a result, it is possible to prevent the excavator 200 from starting work with the charging connector 400 connected to the vehicle inlet 101 for normal charging or the vehicle inlet 102 for quick charging, thereby improving safety. can.

Among the side surfaces of the cabin 10, the side surface on which the normal charging vehicle inlet 101 and the quick charging vehicle inlet 102 are provided is provided with an upper window 11A, a lower window 11B, and a window 11C. The upper window 11A, the lower window 11B, and the window 11C are made of transparent members.

The window 11C is provided in an area where the operator can see the downward direction of the cabin 10 from the position where the operator's head is placed on the seat inside the cabin 10. The upper window 11A and the lower window 11B are provided in the door 10A. Specifically, the upper window 11A and the lower window 11B are provided to cover substantially the entire area of the door 10A.

When the charging connector 400 is connected, the vehicle inlet 101 for normal charging and the vehicle inlet 102 for quick charging are connected to each other through the upper window 11A, the lower window 11B, or the window 11C from the viewpoint of the operator inside the cabin 10. The charging connector 400 or the charging cable 401 is provided at a position where it can be visually recognized. Thereby, even when the door 10A of the cabin 10 is closed, the operator can know whether the charging connector 400 is connected to the vehicle inlet 101 for normal charging or the vehicle inlet 102 for quick charging. As a result, it is possible to prevent the excavator 200 from starting work while the charging connector 400 is connected, thereby improving safety.

Further, the vehicle inlet 101 for normal charging and the vehicle inlet 102 for quick charging are provided near the door 10A. Therefore, when the operator is in the cabin 10 and removes the charging connector 400 from the normal charging vehicle inlet 101 or the quick charging vehicle inlet 102, the charging connector 400 can be removed immediately after getting off the cabin 10. Therefore, the burden of walking etc. on the operator can be reduced.

In the excavator 200 according to the present embodiment, a normal charging vehicle inlet 101 and a quick charging vehicle inlet are provided in the space between the bottom 3B (swivel frame) of the upper revolving body 3 and the floor surface 10D of the cabin 10. 102 are provided. In other words, since the vehicle inlet 101 for normal charging and the vehicle inlet 102 for quick charging are ergonomically provided at a height that is easy to use, the work burden on the operator when connecting the charging connector 400 can be reduced. . In this embodiment, this arrangement enables efficient use of the space existing within the excavator 200.

By the way, the excavator 200 according to the present embodiment and an engine-operated excavator (hereinafter referred to as an engine-operated excavator 1500) have common configurations (for example, the bottom 3B of the upper revolving structure 3, the cabin 10, etc.). It is manufactured and sold as a used series. This makes it possible to reduce costs by using a common configuration.

FIG. 5 is an explanatory diagram showing the difference between the shovel 200 according to this embodiment and the engine-type shovel 1500. As shown in FIG. 5(A), in the engine-type excavator 1500, the position lower than the bottom of the door 10A, in other words, the space between the bottom 3B and the floor of the cabin 10 (the first space ) is configured so that a tool box 1501 can be stored therein.

As shown in FIG. 5(B), in the excavator 200 according to the present embodiment, the position is lower than the bottom of the door 10A, in other words, the space between the bottom 3B and the floor of the cabin 10 (first As described above, the normal charging vehicle inlet 101 covered with the first inner flap 151 and the quick charging vehicle inlet 102 covered with the second inner flap 152 are provided inside the outer flap 150 in the above-mentioned space. , is provided.

In the engine-type excavator 1500 (an example of the first excavator), there is no need to provide the vehicle inlet 101 for normal charging and the vehicle inlet 102 for quick charging. Therefore, in the excavator 200 according to the present embodiment (an example of a second excavator), the space (an example of the first space) in which the vehicle inlet 101 for normal charging and the vehicle inlet 102 for quick charging is provided is In the excavator 1500, a tool box 1501 is used as a storage space. Thereby, effective use of space can be realized for each of shovel 200 and shovel 1500.

Next, in the excavator 200 according to the embodiment, the space 153 after opening the outer flap 150 will be described. FIG. 6 is a diagram showing the arrangement of each component in the interior space 153 when the outer flap 150 is opened according to the present embodiment. As shown in FIG. 6, a first inner flap 151 and a second inner flap 152 are arranged in a space 153 inside when the outer flap 150 is opened. When the first inner flap 151 is opened, the normal charging vehicle inlet 101 is exposed for connection. When the second inner flap 152 is opened, the quick charging vehicle inlet 102 is exposed for connection.

Furthermore, an indicator 160 (an example of a display device) for indicating the charging rate is provided in the space 153. The indicator 160 is provided with, for example, three LEDs. The display of the indicator 160 changes according to the charging rate under the control of the shovel controller 30. For example, when the SOC is 0%, all LEDs are off. When the SOC is 50%, the first LED is on, the second LED is blinking, and the third LED is off. When the SOC is 75%, the first LED and the second LED are lit, and the third LED is blinking. When the SOC is 100%, all LEDs are lit. By referring to the indicator 160, the operator can determine whether it is okay to remove the charging connector 400 from the vehicle inlet 101 for normal charging or the vehicle inlet 102 for quick charging.

That is, in this embodiment, the indicator 160 is provided near the vehicle inlet 101 for normal charging and the vehicle inlet 102 for quick charging. Before the operator boards the cabin 10, the operator can not only check whether the charging connector 400 is connected to the vehicle inlet 101 for normal charging or the vehicle inlet 102 for quick charging, but also check the current SOC (charging status) of the excavator 200. ) can be confirmed. This makes it possible to determine whether or not charging connector 400 can be removed after checking the SOC. This can reduce the burden on the operator before starting work with the shovel 200. Since the charging connector 400 can be removed after confirming that the SOC of the battery module 19 has reached a predetermined standard, shortening of the working time of the excavator 200 can be suppressed.

Moreover, in this embodiment, the vehicle inlet 101 for normal charging, the vehicle inlet 102 for quick charging, and the indicator 160 are provided near the door 10A. Therefore, when the operator boards the cabin 10, the walking distance is almost the same between when the operator attempts to check the SOC and when the operator boards the cabin 10 directly. Therefore, the burden of walking when boarding the cabin 10 after checking the SOC can be reduced.

In this embodiment, an example has been described in which the indicator 160 including three LEDs is used as a display device for displaying the charging rate. However, in this embodiment, the display device is not limited to the indicator 160 using three LEDs, and four or more or two or less LEDs may be used. Furthermore, a liquid crystal panel or the like may be used as the display device. Any display device may be used as long as it can display the charging rate in this manner.

The embodiment described above shows an example of the arrangement of the vehicle inlet 101 for normal charging or the vehicle inlet 102 for quick charging, and is not limited to this arrangement. For example, the normal charging vehicle inlet 101 or the quick charging vehicle inlet 102 may be provided near the rear end of the side surface of the excavator 200 where the cabin 10 is provided. Even with this arrangement, when the operator boards the vehicle, it is possible to confirm whether or not the charging connector 400 is connected. As yet another example, the vehicle inlet 101 for normal charging or the vehicle inlet 102 for quick charging may be provided in front of the center of the bottom of the door 10A of the cabin 10 of the excavator 200. Even with this arrangement, when the operator boards the vehicle, it is possible to confirm whether or not the charging connector 400 is connected. As another example, if there is a reason such as an operator not boarding the cabin 10 of the excavator 200 while the charging connector 400 is connected, the position downward from the approximate center of the bottom of the door 10A may be A vehicle inlet 101 for normal charging and a vehicle inlet 102 for quick charging may be provided.

Further, the number of charging vehicle inlets (an example of a charging port) provided in the excavator 200 is not limited to two, the normal charging vehicle inlet 101 and the quick charging vehicle inlet 102, and may be one. .

<Effect>
In the embodiment described above, the vehicle inlet 101 for normal charging and the vehicle inlet 102 for quick charging are provided on the left side surface of the excavator 200. When the operator boards the excavator 200, the operator boards from the left side of the cabin 10, where the door 10A is provided. Therefore, the operator can confirm whether or not the charging connector 400 is connected without going around to the rear or right side of the shovel 200 before boarding the excavator.

Further, a normal charging vehicle inlet 101 and a quick charging vehicle inlet 102 are provided on the left side of the shovel 200 at a position lower than the bottom of the door 10A. Therefore, when a worker (for example, an operator) connects charging connector 400 to the inlet, there is no need to lift charging connector 400 to a higher position, which can reduce the workload. Furthermore, the vehicle inlet 101 for normal charging and the vehicle inlet 102 for quick charging are provided at a position lower than the rotation range of the door 10A. Therefore, the operator can open the door 10A even with the charging connector 400 connected, and therefore can board the cabin 10 while charging the battery module 19.

In this embodiment, a normal charging vehicle inlet 101 and a quick charging vehicle inlet 102 are provided on the left side of the shovel 200 near the door 10A and behind the center of the bottom of the door 10A. Therefore, when the worker boards the cabin 10, the normal charging vehicle inlet 101 and the quick charging vehicle inlet 102 do not obstruct the worker's boarding, so that the worker can easily board the vehicle. Furthermore, after the operator boards the cabin 10, he or she can visually check whether the charging connector 400 is connected or not by opening the door 10A or looking through the window 11C. Therefore, the operator can be prevented from operating shovel 200 with charging connector 400 connected.

Furthermore, when the charging connector 400 is connected to the vehicle inlet 101 for normal charging or the vehicle inlet 102 for quick charging, the shovel 200 may be controlled not to operate. In such a case, when the operator tries to operate the shovel 200 inside the cabin 10 and the shovel 200 does not operate, the operator can check whether the charging connector 400 is connected or not without getting out of the cabin 10. It can be confirmed visually. Thereby, safety can be improved.

Although the embodiments have been described in detail above, the present disclosure is not limited to such specific embodiments, and various modifications and changes can be made within the scope of the gist described in the claims.

200 Excavator 1 Lower traveling body 2 Swivel mechanism 3 Upper rotating body 3B Bottom 4 Boom 5 Arm 6 Bucket 7 Boom cylinder 8 Arm cylinder 9 Bucket cylinder 10 Cabin 10A Door 10B, 10C Hinge 10D Floor surface 11A Upper window 11B Lower window 11C Window 12 Pump electric motor 14 Main pump 19 Battery module 191 Battery controller 192 Battery 30 Shovel controller 101 Vehicle inlet for normal charging 102 Vehicle inlet for quick charging 103 AC-DC converter for charging 150 Outside flap 151 First inside flap 152 Second inside flap 154, 155, 156 cable

Claims (8)

an upper rotating body;
an electric motor mounted on the upper revolving body;
a battery mounted on the upper revolving body to supply power to the electric motor;
a cabin mounted on the upper revolving body;
an openable/closable door provided in the cabin;
a charging port connectable to a charging mechanism that supplies power to the battery from an external power source;
The charging port is provided at a position lower than the bottom part of the door on the surface of the upper revolving body where the door is provided.
Electric excavator. The charging port is further provided in the vicinity of the door and behind the center of the bottom portion of the door on the surface of the upper revolving body on which the door is provided.
The electric excavator according to claim 1. The door is provided so as to be rotatable in a rearward direction of the electric excavator and fixed to a side surface of the upper revolving body.
The electric excavator according to claim 1 or 2. At least a part of the side surface of the cabin on the side where the charging port is provided is formed of a transparent member,
When the charging mechanism connected to the charging port is connected, the charging port can be connected to the charging mechanism or the charging port through the partial area formed of the transparent member from a viewpoint inside the cabin. The cable of the charging mechanism is installed in a position where it can be seen.
The electric excavator according to claim 1 or 2. The charging port is provided between the bottom of the upper revolving body and the floor surface of the cabin,
The electric excavator according to any one of claims 1 to 4. A display device indicating a charging rate of the battery is provided near the charging port.
The electric excavator according to any one of claims 1 to 5. The battery is mounted on the front right side of the upper revolving body,
The charging port is provided on the left side of the upper revolving body and is connected to the battery by a power line.
An electric excavator according to any one of claims 1 to 6. A first shovel that is operated by an engine, and a second shovel that is operated by an electric motor using electric power supplied from a battery,
Each of the first shovel and the second shovel includes an upper revolving body, a cabin mounted on the upper revolving body, and an openable/closable door provided in the cabin,
In the first excavator, a tool box is stored in a first space provided in the upper revolving body at a position lower than the bottom part of the door,
The second shovel is provided with a charging port connectable to a charging mechanism that supplies power to the battery from an external power source in the first space.
Excavator series.

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