electric excavator

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

Technical Field

[0001] The present disclosure relates to an electric shovel To .

Background Art

[0002] In recent years, an electric-driven shovel having an electric motor that operates a hydraulic drive system has been proposed. In this electric-driven shovel, the electric motor is driven by electric power supplied from a battery provided in the main body.

[0003] The electric-driven shovel is provided with a charging port for charging the battery. In the technology described in Patent Document 1, the battery is mounted behind the shovel, and the charging port is installed on the battery. In this shovel, the charging port appears by opening the rear cover.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the technology described in Patent Document 1, since the charging port is provided behind the shovel, it is difficult for the operator on the shovel to check whether the charging cable is connected to the charging port.

[0006] Therefore, in view of the above problems, it is an object to improve safety by facilitating the confirmation of whether a charging connector is connected to the charging port.

Means for Solving the Problems

[0007] To achieve the above objective, an electric excavator according to one embodiment of the present disclosure includes an upper rotating body, an electric motor mounted on the upper rotating body, a battery mounted on the upper rotating body for supplying power to the electric motor, a cabin mounted on the upper rotating body, an openable and closable door provided in the cabin, and a charging port connectable to a charging mechanism that supplies power to the battery from an external power source. At least a portion of the side surface of the cabin on the side where the charging port is located is formed of a transparent material. The charging port is provided on the surface of the upper rotating body on which the door is located, at a position lower than the bottom edge of the door. Furthermore, when the charging mechanism connected to the charging port is connected, the charging mechanism or the cable of the charging mechanism is positioned so that it can be seen from a viewpoint inside the cabin through the part of the transparent member formed thereon. . [Effects of the Invention]

[0008] According to the above embodiment, safety is improved by making it easier to check whether or not a charging connector is connected to the charging port when boarding the cabin. [Brief explanation of the drawing]

[0009] [Figure 1] Figure 1 is a side view showing a shovel (excavator) according to an embodiment. [Figure 2] Figure 2 is a schematic block diagram showing an example of the configuration of an excavator according to this embodiment. [Figure 3] Figure 3 is a top view showing an example of the arrangement structure of various devices in the upper rotating body according to the embodiment. [Figure 4] Figure 4 shows the external appearance of the shovel according to this embodiment. [Figure 5] Figure 5 is an explanatory diagram showing the difference between the excavator according to the embodiment and an engine-powered excavator. [Figure 6] Figure 6 is a diagram showing the arrangement of each component in the internal space with the outer flap open according to the embodiment. [Modes for carrying out the invention]

[0010] Embodiments of the present invention will be described below with reference to the drawings. Furthermore, the embodiments described below are illustrative and not limiting to the invention, and not all features or combinations thereof described in the embodiments are necessarily essential to the invention. In addition, identical or corresponding components in each drawing are denoted by the same or corresponding reference numerals, and their descriptions may be omitted.

[0011] (First embodiment) First, as an example of an electric excavator, an overview of the excavator 200 according to the first embodiment will be described.

[0012] [Shovel Overview] As shown in Figure 1, the excavator 200 according to this embodiment comprises a lower traveling body 1, an upper rotating body 3 mounted on the lower traveling body 1 so as to be rotatable via a slewing mechanism 2, a boom 4, an arm 5, and a bucket 6 as attachments, and a cabin 10.

[0013] The lower traveling body 1 includes, for example, a pair of left and right crawlers, and each crawler is hydraulically driven by a travel hydraulic motor 1R, 1L (see Figure 2), allowing it to move under its own power.

[0014] The upper rotating body 3 rotates relative to the lower traveling body 1 by being hydraulically driven by a rotating hydraulic motor 2M (see Figure 2) via a rotating mechanism 2. All driven elements (e.g., the rotating hydraulic motor 2M) are hydraulically driven by the hydraulic fluid supplied from the main pump 14 (see Figure 2). This is equivalent to a configuration in which the power source (engine) of a so-called hydraulic excavator is replaced with an electric pump 12.

[0015] Further, the upper swing body 3 may be electrically driven by a swing electric motor that is driven by the electric power supplied from the battery module 19 instead of the swing hydraulic motor 2M through the swing mechanism 2. In this case, for example, the excavator 200 is connected from the battery module 19 to the swing electric motor via the power conversion device 100 and the inverter. Then, the swing electric motor may perform a power running operation to swing-drive the upper swing body 3 and a regeneration operation to generate regenerative power and swing-brake the upper swing body 3 under the control of the excavator controller 30 and the inverter. Further, the swing electric motor may supply the regenerative power to the battery module 19 or the pump electric motor 12 via the inverter.

[0016] The boom 4 is attached to the front center of the upper swing body 3 so as to be able to pitch, an arm 5 is attached to the tip of the boom 4 so as to be able to rotate vertically, and a bucket 6 is attached to the tip of the arm 5 so as to be able to rotate vertically. The boom 4, the arm 5, and the bucket 6 are each hydraulically driven by a boom cylinder 7, an arm cylinder 8, and a bucket cylinder 9 as hydraulic actuators.

[0017] The bucket 6 is an example of an end attachment, and another end attachment may be attached to the tip of the arm 5 instead of the bucket 6 according to the work content or the like. The other end attachment may be, for example, a bucket of a different type from the bucket 6 such as a slope bucket or a dredging bucket. Further, the other end attachment may be, for example, an end attachment of a different type from the bucket such as a breaker, a stirrer, or a grapple.

[0018] The cab 10 is mounted on the front left side of the upper swing body 3, and inside it (the interior), there are provided a driver's seat on which an operator sits, an operation device 26 (see FIG. 2) described later, and the like.

[0019] A rotatable door 10A is provided on the left side of the cabin 10. Hinges (rotation shafts) 10B and 10C are provided on the rear long side of the door 10A. The door 10A is rotatable approximately 180 degrees in the rear direction DB with reference to the hinges (rotation shafts) 10B and 10C.

[0020] An outer flap 150 (an example of an outer cover member) is provided at approximately the center of the left side surface of the upper swing body 3. The outer flap 150 is openable and closable, and in the space inside the opened outer flap 150, a vehicle inlet for charging (an example of a charging port) for charging the shovel 200 and the like are provided. The vehicle inlet for charging will be described later.

[0021] The shovel 200 operates driven elements such as the lower traveling body 1 (left and right crawlers), the upper swing body 3, the boom 4, the arm 5, and the bucket 6 according to the operation of an operator boarding the cabin 10.

[0022] Alternatively, or in addition to being configured to be operable by an operator boarding the cabin 10, the shovel 200 may be configured to be remotely operated (remote controlled) from outside the shovel 200. When the shovel 200 is remotely operated, the inside of the cabin 10 may be unmanned. Hereinafter, the description will proceed on the premise that the operation of the operator includes at least one of the operation on the operation device 26 of the operator in the cabin 10 and the remote operation of an external operator.

[0023] Remote operation includes, for example, a mode in which the shovel 200 is operated by operation inputs related to the actuator of the shovel 200 performed by a predetermined external device. In this case, the shovel 200 may be equipped with a communication device (not shown) capable of communicating with a predetermined external device, and may transmit image information (captured image) output by an imaging device (not shown) to the external device. The external device may then display the received image information (captured image) on a display device (hereinafter, "remote operation display device") provided on its own device. In addition, various information images (information screens) displayed on the output device 50 (display device) inside the cabin 10 of the shovel 200 may also be displayed on the remote operation display device of the external device. This allows the operator of the external device to remotely operate the shovel 200 while checking the display contents, such as captured images and information screens showing the surroundings of the shovel 200, displayed on the remote operation display device. The shovel 200 may then operate a hydraulic actuator in response to a remote control signal, which is received from an external device via a communication device and represents the content of the remote control, thereby driving the driven elements such as the lower traveling body 1 (left and right crawlers), the upper slewing body 3, the boom 4, the arm 5, and the bucket 6.

[0024] Furthermore, remote operation may include, for example, a mode in which the shovel 200 is operated by external voice input or gesture input from people (e.g., workers) in the vicinity of the shovel 200. Specifically, the shovel 200 recognizes voices spoken by surrounding workers or gestures made by workers through a voice input device (e.g., microphone) or gesture input device (e.g., imaging device) mounted on the shovel 200 (itself). The shovel 200 may then operate actuators according to the content of the recognized voices or gestures to drive driven elements such as the lower traveling body 1 (left and right crawlers), the upper slewing body 3, the boom 4, the arm 5, and the bucket 6.

[0025] Furthermore, the shovel 200 may operate its actuators automatically, regardless of the operator's actions. This enables the shovel 200 to automatically operate at least some of its driven elements, such as the lower traveling body 1 (crawler 1CL, 1CR), upper slewing body 3, boom 4, arm 5, and bucket 6 (a so-called "automatic driving function" or "machine control function").

[0026] The automatic driving function may include a function that automatically operates driven elements (actuators) other than the target driven element (hydraulic actuator) in response to the operator's operation device 26 or remote operation (a so-called "semi-automatic driving function"). The automatic driving function may also include a function that automatically operates at least some of the multiple driven elements (actuators) on the premise that there is no operator operation device 26 or remote operation (a so-called "fully automatic driving function"). In the case of the shovel 200, if the fully automatic driving function is enabled, the interior of the cabin 10 may be unoccupied. Furthermore, the semi-automatic driving function and fully automatic driving function may include a mode in which the operation content of the driven elements (actuators) subject to automatic driving is automatically determined according to predetermined rules. Furthermore, the semi-automatic driving function and fully automatic driving function may also include a mode in which the shovel 200 autonomously makes various judgments, and the operation content of the driven elements (actuators) subject to automatic driving is autonomously determined according to the results of those judgments (a so-called "autonomous driving function").

[0027] [Shovel configuration] Next, with reference to Figure 1 and Figure 2, the configuration of the shovel 200 according to this embodiment will be described.

[0028] Figure 2 is a schematic block diagram showing an example of the configuration of the shovel 200 according to this embodiment.

[0029] In Figure 2, mechanical power lines are shown as double lines, hydraulic lines as thick solid lines, pilot lines as dashed lines, and electric drive / control lines as thin solid lines.

[0030] <Hydraulic drive system> The hydraulic drive system of the excavator 200 according to this embodiment includes hydraulic travel motors 1R and 1L, a swing hydraulic motor 2M, a boom cylinder 7, an arm cylinder 8, and a bucket cylinder 9, which hydraulically drive each of the driven elements such as the lower traveling body 1, boom 4, arm 5, and bucket 6. The hydraulic drive system of the excavator 200 according to this embodiment also includes a pump motor 12, a main pump 14, and a control valve 17.

[0031] The pump motor 12 (an example of a motor) is the power source for the hydraulic drive system. The pump motor 12 is, for example, an IPM (Interior Permanent Magnet) motor. The pump motor 12 is connected to a high-voltage power supply including a battery module 19 and a power converter 100 via an inverter 18. The pump motor 12 is powered by three-phase AC power supplied from the battery module 19 via the inverter 18 and drives the main pump 14 and the pilot pump 15. The drive control of the pump motor 12 may be performed by the inverter 18 under the control of the shovel controller 30, which will be described later.

[0032] The main pump 14 draws hydraulic fluid from the hydraulic fluid tank T and discharges it into the high-pressure hydraulic line 16, thereby supplying hydraulic fluid to the control valve 17 through the high-pressure hydraulic line 16. The main pump 14 is driven by a pump motor 12. The main pump 14 is, for example, a variable displacement hydraulic pump, and under the control of the shovel controller 30 (described later), a regulator (not shown) controls the angle (tilt angle) of the swash plate. This allows the main pump 14 to adjust the piston stroke length and thus adjust the discharge flow rate (discharge pressure).

[0033] The main pump 14 may be driven by power from another power source in addition to the electric motor 12 for the pump. For example, the energy of the hydraulic fluid discharged from the boom cylinder 7 and arm cylinder 8 to the hydraulic fluid tank due to the weight of the boom 4 and arm 5 when the boom 4 is lowered or the arm 5 is closed may be regenerated to drive the main pump 14. Specifically, the energy of the hydraulic fluid discharged from the boom cylinder 7 and arm cylinder 8 to the hydraulic fluid tank due to the weight of the boom 4 and arm 5 when the boom 4 is lowered or the arm 5 is closed may be used to drive a hydraulic motor arranged coaxially with the rotation axis of the main pump 14. Alternatively, the energy of the hydraulic fluid discharged from the boom cylinder 7 and arm cylinder 8 to the hydraulic fluid tank due to the weight of the boom 4 and arm 5 when the boom 4 is lowered or the arm 5 is closed may be regenerated to power a generator. Specifically, when the boom 4 is lowered or the arm 5 is closed, the energy of the hydraulic fluid discharged from the boom cylinder 7 and arm cylinder 8 into the hydraulic fluid tank due to the weight of the boom 4 and arm 5 can be used to drive a hydraulic motor arranged coaxially with the generator, thereby causing the generator to produce electricity. In this case, the power generated by the generator may be supplied to the pump motor 12 or used to charge the battery module 19.

[0034] The control valve 17 is a hydraulic control device that controls the hydraulic drive system in response to operator commands or automatic driving functions. As described above, the control valve 17 is connected to the main pump 14 via the high-pressure hydraulic line 16 and is configured to selectively supply hydraulic fluid 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 multiple control valves (directional control valves) that control the flow rate and direction of the hydraulic fluid supplied from the main pump 14 to each of the hydraulic actuators. The hydraulic fluid supplied from the main pump 14 and that has passed through the control valve 17 and hydraulic actuators is discharged from the control valve 17 to the hydraulic fluid tank T.

[0035] <Electric drive system> The electric drive system of the shovel 200 according to this embodiment includes a pump motor 12, a sensor 12s, and an inverter 18. The electric drive system of the shovel 200 according to this embodiment also includes a high-voltage power supply consisting of a battery module 19 and a power converter 100, etc.

[0036] Sensor 12s includes a current sensor 12s1, a voltage sensor 12s2, and a rotational state sensor 12s3.

[0037] 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 installed, for example, in the power path between the pump motor 12 and the inverter 18. The detection signals corresponding to each of the three phases of the pump motor 12 detected by the current sensor 12s1 are directly received by the inverter 18 via a communication line. Alternatively, these detection signals may be received by the shovel controller 30 via a communication line and input to the inverter 18 via the shovel controller 30.

[0038] The voltage sensor 12s2 detects the applied voltage to each of the three phases of the pump motor 12. The voltage sensor 12s2 is installed, for example, in the power path between the pump motor 12 and the inverter 18. The detection signals corresponding to the applied voltages of each of the three phases of the pump motor 12 detected by the voltage sensor 12s2 are directly received by the inverter 18 via a communication line. Alternatively, these detection signals may be received by the shovel controller 30 via a communication line and input to the inverter 18 via the shovel controller 30.

[0039] The rotational state sensor 12s3 detects the rotational state of the pump motor 12 (e.g., rotational position (rotation angle), rotational speed, etc.). The rotational state sensor 12s3 is, for example, a rotary encoder or a resolver.

[0040] The inverter 18 drives the pump motor 12 under the control of the shovel controller 30. The inverter 18 includes, for example, a conversion circuit that converts DC power to three-phase AC power and three-phase AC power to DC power, a drive circuit that switches and drives the conversion circuit, and a control circuit that outputs a control signal (for example, a PWM (Pulse Width Modulation) signal) that defines the operation of the drive circuit.

[0041] The control circuit of the inverter 18 controls the drive of the pump motor 12 while understanding its operating state. For example, the control circuit of the inverter 18 understands the operating state of the pump motor 12 based on the detection signal of the rotation state sensor 12s3. Alternatively, the control circuit of the inverter 18 may understand the operating state of the pump motor 12 by sequentially estimating 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 during the control process).

[0042] Furthermore, at least one of the drive circuit and control circuit of the inverter 18 may be provided outside the inverter 18.

[0043] The battery module 19 is configured to supply charged power to the electronic components within the shovel 200. The specific configuration will be described later.

[0044] The power converter 100 either boosts the power to the battery module 19 or reduces the power from the pump motor 12 via the inverter 18 and stores it in the battery module 19. The power converter 100 switches between boosting and bucking operations depending on the operating state of the pump motor 12 so that the voltage value of the DC (Direct Current) bus 110 stays within a certain range. The switching control between the boosting and bucking operations of the power converter 100 may be performed by the shovel controller 30, for example, based on the voltage detection value of the DC bus 110, the voltage detection value of the battery module 19, and the current detection value of the battery module 19.

[0045] Furthermore, if it is not necessary 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.

[0046] <Operation system> The operating system of the shovel 200 according to this embodiment includes a pilot pump 15, an operating device 26, and a pressure control valve 31.

[0047] The pilot pump 15 supplies pilot pressure to various hydraulic devices (e.g., pressure control valve 31) mounted on the shovel 200 via the pilot line 25. This allows the pressure control valve 31 to supply pilot pressure to the control valve 17 according to the operation of the operating device 26 (e.g., operating amount and direction) 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 operation of the operating device 26 by the operator. Furthermore, the pressure control valve 31 can supply pilot pressure to the control valve 17 according to the remote operation content specified by the remote operation signal under the control of the shovel controller 30. The pilot pump 15 is, for example, a fixed-displacement hydraulic pump and is driven by the pump motor 12 as described above.

[0048] The control device 26 is located within reach of the operator in the cockpit of the cabin 10 and is used by the operator to operate each of the driven elements (i.e., the left and right crawlers of the lower traveling body 1, the upper slewing body 3, the boom 4, the arm 5, and the bucket 6, etc.). In other words, the control device 26 is used by the operator to operate the hydraulic actuators (e.g., travel hydraulic motors 1R, 1L, slewing hydraulic motor 2M, boom cylinder 7, arm cylinder 8, and bucket cylinder 9, etc.) or electric actuators that drive each of the driven elements. The control device 26 is, for example, electrically operated and outputs an electrical signal (hereinafter referred to as "operation signal") corresponding to the operator's operation. The operation signal output from the control device 26 is taken up by the shovel controller 30 via the signal line 28. As a result, the shovel controller 30 controls the pressure control valve 31 and controls the operation of the driven elements (actuators) of the shovel 200 in accordance with the operator's operation and operation commands corresponding to the automatic driving function.

[0049] The operating device 26 includes, for example, levers 26A to 26C. Lever 26A may be configured to accept operations on the arm 5 (arm cylinder 8) and the upper slewing body 3 (slewing motion) in response to forward / backward and left / right movements, respectively. Lever 26B may be configured to accept operations on the boom 4 (boom cylinder 7) and the bucket 6 (bucket cylinder 9) in response to forward / backward and left / right movements, respectively. Lever 26C may be configured to accept operations on the lower traveling body 1 (crawler), for example.

[0050] Furthermore, if the control valve 17 is composed of an electromagnetic pilot-operated control valve (directional control valve), the operating signal from the electric operating device 26 may be directly input to the control valve 17, and each hydraulic control valve may perform an operation according to the operation of the operating device 26. Alternatively, the operating device 26 may be a hydraulic pilot type that outputs a pilot pressure according to the operation. In this case, the pilot pressure according to the operation is supplied to the control valve 17.

[0051] The pressure control valve 31 outputs a predetermined pilot pressure using hydraulic fluid supplied from the pilot pump 15 through the pilot line 25 under the control of the shovel controller 30. The 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.

[0052] <Power system> Shovel 200 includes a vehicle inlet 101 for normal charging and a vehicle inlet 102 for rapid charging as a configuration for charging the battery module 19.

[0053] The vehicle inlet 101 for normal charging is configured to be connectable to a charging connector (an example of a charging component) provided at the tip of a predetermined cable (hereinafter referred to as the "charging cable") of an external power supply.

[0054] The AC-DC converter 103 for charging converts AC power supplied from an external power source via the vehicle inlet 101 for normal charging into DC power that can be used to charge the battery 192, and supplies it to the battery module 19.

[0055] The rapid charging vehicle inlet 102 is configured to be connectable to a charging connector (an example of a charging component) provided at the end of a charging cable of an external power source (e.g., a charging station). The rapid charging vehicle inlet 102 is, for example, an inlet for performing rapid charging based on CHAdeMO®. 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.

[0056] This embodiment describes an example in which a charging component is directly connected to a vehicle inlet 101 for normal charging (an example of a charging port) and a vehicle inlet 102 for rapid charging (an example of a charging port) using a charging connector provided at the tip of a charging cable.

[0057] The battery module 19 of the excavator 200 according to this embodiment supplies power to each component within the excavator 200. The battery module 19 includes a battery 192 and a battery controller 191.

[0058] The battery 192 supplies power to various components within the shovel 200. For example, the battery 192 supplies charged (stored) power to the pump motor 12. The battery 192 also charges the power generated (regenerative power) of the pump motor 12.

[0059] Battery 192 is charged (stored) by being connected to an external power source via a charging cable.

[0060] Battery 192 is, for example, a lithium-ion battery and has a relatively high output voltage (e.g., several hundred volts).

[0061] The battery controller 191 controls the internal configuration of the battery module 19. For example, the battery controller 191 monitors the temperature status of the battery 192 from the output of a temperature sensor (not shown) and calculates the State of Charge (SOC) of the battery 192. The battery controller 191 then outputs the temperature sensor detection result and the SOC to the shovel controller 30. This allows the shovel controller 30 to 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.

[0062] In this embodiment, the battery controller 191 determines whether or not charging is possible depending on whether or not a charging connector is connected to the vehicle inlet 101 for normal charging or the vehicle inlet 102 for rapid charging. However, this embodiment is not limited to determining whether or not power can be supplied based on whether or not a charging connector is connected. For example, in the case of wireless power supply, other methods may be used, such as determining whether or not power can be supplied by mutual communication with charging equipment provided with an external power source.

[0063] The battery controller 191 then communicates with the charging equipment that has an external power source (e.g., a charging station) when it determines that it is connected to an external power source via a charging cable and charging connector (in other words, when it determines that it is in a state where power can be supplied). The battery controller 191 then communicates with the charging equipment and, if the charging equipment authorizes the supply of power, it starts supplying power from the external power source.

[0064] <Control System> The control system for the shovel 200 according to this embodiment includes a shovel controller 30, an output device 50, and an input device 52.

[0065] The output device 50 is located inside 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, for example, installed in a location easily visible to the operator inside the cabin 10 and displaying various information images under the control of the shovel controller 30. The display device may be, for example, a liquid crystal display or an organic EL (electroluminescence) display. The output device 50 also includes, for example, a sound output device that outputs information to the operator in an auditory manner. The sound output device may be, for example, a buzzer or a speaker.

[0066] The input device 52 is located inside the cabin 10 and receives various inputs from the operator. The input device 52 may include, for example, an operation input device that receives operation inputs from the operator. The operation input device includes, for example, buttons, toggles, levers, touch panels, touch pads, etc. The input device 52 may also include, for example, an audio input device that receives voice inputs from the operator and a gesture input device that receives gesture inputs from the operator. The audio input device includes, for example, a microphone that acquires the voice of the operator inside the cabin 10. The gesture input device includes, for example, an indoor camera capable of capturing images of the operator's gestures inside the cabin 10. Signals corresponding to the operator inputs received by the input device 52 are taken up by the shovel controller 30.

[0067] The shovel controller 30 may implement each function using any hardware, or any combination of hardware and software. For example, the shovel controller 30 may be centered around a computer that includes a processor such as a CPU (Central Processing Unit), a memory device (main memory) such as RAM (Random Access Memory), a non-volatile auxiliary storage device such as ROM (Read Only Memory), and an interface device for input / output with the outside.

[0068] The shovel controller 30 controls the drive 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 the pressure control valve 31 outputs a pilot pressure corresponding to the operation of the operating device 26. In this way, the shovel controller 30 can realize the operation of the driven elements (hydraulic actuators) of the shovel 200 that correspond to the operation of the electric operating device 26.

[0069] Furthermore, if the shovel 200 is remotely controlled, the shovel controller 30 may, for example, perform control related to the remote operation. Specifically, the shovel controller 30 may output a control command to the pressure control valve 31, causing the pressure control valve 31 to output a pilot pressure corresponding to the remote operation. This allows the shovel controller 30 to realize the operation of the shovel 200 (driven element) corresponding to the remote operation.

[0070] Furthermore, the shovel controller 30 may also perform control related to the automatic driving function, for example. Specifically, the shovel controller 30 may output a control command to the pressure control valve 31 and apply a pilot pressure corresponding to the operation command for the automatic driving function from the pressure control valve 31 to the control valve 17. In this way, the shovel controller 30 can realize the operation of the driven elements (hydraulic actuators) of the shovel 200 that correspond to the automatic driving function.

[0071] The shovel controller 30 may comprehensively control the operation of the entire shovel 200 (various devices mounted on the shovel 200).

[0072] The shovel controller 30 controls the operation of the electric drive system based on various input information (for example, control commands including operation signals from the operating device 26). It may also control the illumination of the indicator 160 based on signals from the battery controller 191.

[0073] Furthermore, the shovel controller 30 may, for example, drive the power converter 100 based on the operating state of the operating device 26 and control the switching between boost and buck operation of the power converter 100, in other words, between the discharge state and the charge state of the battery module 19. Also, if the shovel 200 is remotely operated, the shovel controller 30 may, for example, drive the power converter 100 based on the content of the remote operation and control the switching between the discharge state and the charge state of the battery module 19. Furthermore, if the automatic operation function of the shovel 200 is enabled, the shovel controller 30 may, for example, drive the power converter 100 based on the operation command corresponding to the automatic operation function and control the switching between the discharge state and the charge state of the battery module 19.

[0074] <Placement of equipment installed on the upper rotating body> Figure 3 is a top view showing an example of the arrangement structure of various equipment on the upper rotating body 3. In Figure 3, the housing section, which is the exterior of the upper rotating body 3, is omitted in order to expose the various equipment on the upper rotating body 3.

[0075] In this embodiment, the upper slewing body 3 is configured such that, when viewed from above, its rear end is approximately arc-shaped with respect to the pivot center (axis) 3X. This allows the slewing radius of the rear of the upper slewing body 3 to be relatively small. The slewing radius of the rear of the upper slewing body 3 refers to the radius of the trajectory (outer edge) traced by the rear of the upper slewing body 3 when it rotates, with respect to the pivot center 3X. The shovel 200 is, for example, a rear-extending ultra-short-slewing type shovel. A rear-extending ultra-short-slewing type shovel means a shovel in which the ratio of the slewing radius of the rear of the upper slewing body 3 to half (1 / 2) of the total width of the crawler 1C is within 120 percent. This allows the shovel 200 to improve workability in confined work sites.

[0076] On the other hand, in the case of a rear-extending ultra-short swing excavator, the space at the rear (-X direction) of the upper swing body 3, especially the space at the left and right (Y-axis direction) ends, is reduced and becomes relatively smaller. Furthermore, as electrification is progressing, especially in small machines, even in electric excavators 200 that are not rear-extending ultra-short swing excavators, the space at the rear of the upper swing body 3 is inherently limited and tends to be relatively small. Therefore, if relatively large components are placed at the rear of the upper swing body 3, it may increase dead space and make it impossible to achieve an efficient arrangement structure for the components.

[0077] Therefore, in this embodiment, the battery module 19, which is one of the largest components mounted on the upper slewing body 3, is placed on the front right side (-Y direction side) of the upper slewing body 3. The front right side is roughly rectangular in shape. The battery module 19 is formed in a shape corresponding to the front right side. The electric motor 12 for the pump and the main pump 14 are mounted on the rear of the upper slewing body 3.

[0078] As a result, the shovel 200 can relatively reduce dead space by positioning the relatively small pump motor 12 and main pump 14, etc., at the rear of the upper rotating body 3. Furthermore, the shovel 200 can secure a relatively large placement space for the battery module 19 along the right side of the upper rotating body 3, where the lateral position changes are small in the front-to-back direction (X-axis direction) when viewed from above. Therefore, the shovel 200 can achieve an efficient arrangement structure for the components of the upper rotating body 3, including the battery module 19.

[0079] The area extending from the center of the rear of the upper rotating body 3 in the left-right direction (Y-axis direction) to the right end (-Y direction side end) is equipped with a pump motor 12, a main pump 14, a pilot pump 15, a control valve 17, and an inverter 18.

[0080] The pump motor 12 and inverter 18 are integrally arranged in the center of the rear of the upper slewing body 3 in the left-right direction (Y-axis direction). The pump motor 12 and inverter 18 are arranged such that the rotation axis of the pump motor 12 is aligned in the left-right direction (Y-axis direction) and the output shaft extends to the right. For example, the pump motor 12 is mounted on the bottom 3B (slewing frame) of the upper slewing body 3 via a mounting member. Specifically, the pump motor 12 may be positioned relatively close to the bottom 3B so that the positions of the main pump 14 and pilot pump 15, which are connected in a mechanically drivable manner, are as low as possible. This allows the position of the main pump 14 to be lower than the liquid level inside the hydraulic oil tank T. Therefore, the occurrence of air entrapment in the main pump 14 can be suppressed.

[0081] The main pump 14 and pilot pump 15 are positioned adjacent to the right side of the pump motor 12, with their input shafts connected to the output shaft of the pump motor 12. The main pump 14 and pilot pump 15 are mounted on the bottom 3B via the pump motor 12, for example, by being connected to the pump motor 12.

[0082] The control valve 17 is positioned at the center of the rear of the upper slewing body 3 in the left-right direction (Y-axis direction) and above the pump motor 12. For example, the pump motor 12 and the main pump 14 are positioned at a relatively low position in the space between the bottom 3B of the upper slewing body 3 and the housing, while the control valve 17 is positioned at a relatively high position in that space. Specifically, a support frame 17MT is attached to the bottom 3B so as to straddle the pump motor 12 in the front-rear direction (X-axis direction). The control valve 17 is then mounted on the support frame 17MT and thus mounted on the bottom 3B via the support frame 17MT.

[0083] The control valve 17 may be positioned above the main pump 14 or the pilot pump. Alternatively, the control valve 17 may be positioned to straddle the space between the pump motor 12 and the main pump 14 or pilot pump 15 in the left-right direction (Y-axis direction).

[0084] A hydraulic slewing motor 2M is mounted in the center of the upper slewing body 3.

[0085] A hydraulic oil tank T is positioned in the space between the slewing hydraulic motor 2M, the pump electric motor 12, and the control valve 17 in the front-rear direction (X-axis direction). The hydraulic oil tank T is mounted on the bottom 3B either directly or via a bracket or the like.

[0086] On the left side (+Y direction side) of the cabin 10 of the upper rotating body 3, a vehicle inlet 101 for normal charging and a vehicle inlet 102 for rapid charging are provided. The vehicle inlet 101 for normal charging and the vehicle inlet 102 for rapid charging are arranged side by side, for example, in the front-to-back direction (X-axis direction). An AC-DC converter 103 for charging is also located inside the cabin 10.

[0087] The vehicle inlet 101 for standard charging (an example of a charging port) can be connected to a charging connector. The vehicle inlet 102 for rapid charging (an example of a charging port) can be connected to a charging connector.

[0088] 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 connects the vehicle inlet 101 for normal charging and the AC-DC converter 103 for charging without any detours, the length of the cable 154 is kept to a minimum.

[0089] Furthermore, the AC-DC converter 103 for charging and the battery module 19 are connected by a cable 155 (an example of a power line). Since the cable 155 connects the AC-DC converter 103 and the battery module 19 without any detours, the length of the cable 155 is kept to a minimum.

[0090] Furthermore, the vehicle inlet 102 for rapid charging and the battery module 19 are connected by a cable 156 (an example of a power line). Since the cable 156 connects the vehicle inlet 102 and the battery module 19 in a nearly straight line, the length of the cable 156 is kept to a minimum.

[0091] In this embodiment, the power supply path between the vehicle inlet 101 for normal charging or the vehicle inlet 102 for rapid charging and the battery module 19 is shortened by the cables 154, 155, and 156, thereby reducing cable costs and suppressing noise generation.

[0092] As shown in Figure 3, an openable and closable outer flap 150 is provided on the left side of the upper rotating body 3. Inside the space 153 created by opening the outer flap 150, there is 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 rapid charging.

[0093] The first inner flap 151 and the second inner flap are openable and closable. For example, when connecting a charging connector to the vehicle inlet 101 for normal charging, the first inner flap 151 is opened. Furthermore, when connecting a charging connector to the vehicle inlet 102 for rapid charging, the second inner flap 152 is opened.

[0094] Next, we will explain why the vehicle inlet 101 for normal charging and the vehicle inlet 102 for rapid charging are located on the left side of the cabin 10 of the upper rotating body 3.

[0095] Figure 4 shows the external appearance of the shovel 200 according to this embodiment. Figure 4(A) is a front view of the shovel 200, and Figure 4(B) is a perspective view of the shovel 200 according to this embodiment.

[0096] The example shown in Figure 4 illustrates the situation of charging the shovel 200. Specifically, it shows the situation with the outer flap 150 open, and the charging connector 400 connected to either the normal charging vehicle inlet 101 or the rapid charging vehicle inlet 102, which are stored inside the outer flap 150. The charging connector 400 is connected to an external power source via the charging cable 401.

[0097] For example, the charging connector 400, when used for fast charging, weighs approximately 1 to 1.5 kg. If the charging cable 401 is for fast charging, it is conceivable that a 100 kW class cable would be used. Such a 100 kW class cable would have a thickness of approximately 70 sq mm. Therefore, the charging cable 401 would naturally be heavy. This would also increase the burden on the worker who attaches and detaches the charging connector 400. Furthermore, the shovel 200 requires frequent charging, such as multiple times a day, in order to perform its duties.

[0098] In other words, it is preferable that the vehicle inlet 101 for normal charging or the vehicle inlet 102 for rapid charging be located in a position that makes it easy to connect to the charging connector 400.

[0099] Therefore, in the excavator 200 according to this embodiment, the vehicle inlet 101 for normal charging and the vehicle inlet 102 for rapid charging are provided on the side of the upper rotating body 3 where the door 10A is located, at a position lower than the bottom edge of the door 10A.

[0100] If the vehicle inlet for normal charging or the vehicle inlet for rapid charging were located above the shovel, it would require effort to lift the charging connector. Therefore, in this embodiment, by providing the vehicle inlet for normal charging 101 or the vehicle inlet for rapid charging 102 at a position lower than the bottom of the door 10A of the shovel 200, the operator can easily connect the charging connector 400, thereby reducing the workload.

[0101] Incidentally, instead of providing the normal charging vehicle inlet 101 and the rapid charging vehicle inlet 102 at a position lower than the bottom of the door 10A of the shovel 200, as in this embodiment, it is also conceivable to provide the charging vehicle inlet behind the cabin door. However, the door of a shovel is often provided so as to be able to rotate to the rear, and in some cases it can rotate 180 degrees. In other words, if the charging vehicle inlet is provided behind the cabin door, there is a possibility that the door and the charging connector may come into contact when the shovel door is rotated during charging.

[0102] Therefore, in this embodiment, a standard charging vehicle inlet 101 and a rapid charging vehicle inlet 102 are provided at a position lower than the bottom of the door 10A of the shovel 200. As a result, even when the door 10A is rotated while the charging connector 400 is connected to the standard charging vehicle inlet 101 or the rapid charging vehicle inlet 102, contact between the door 10A and the charging connector 400 can be suppressed. This suppresses malfunctions caused by contact between the door 10A and the charging connector 400, thereby improving safety.

[0103] Furthermore, in electric-driven excavators such as the Shovel 200, charging the battery module 19 takes time. For this reason, after connecting the charging connector 400 to the vehicle inlet for normal charging or the vehicle inlet for rapid charging, the operator (the person performing the charging work, for example, the operator) often leaves the Shovel 200. When the operator gets into the Shovel 200 to start work, some time has passed since charging began, so it is possible that they have forgotten that the charging connector 400 was connected to the Shovel 200. Moreover, the operator who gets into the Shovel 200 and the person who connected the charging connector 400 to the vehicle inlet for normal charging or the vehicle inlet for rapid charging may be different. In many cases, it is not anticipated that the Shovel 200 will perform work with the charging connector 400 connected to it, and it is undesirable for the operator to be unaware that the Shovel 200 is connected to the charging connector 400.

[0104] Therefore, in the excavator 200 according to this embodiment, the normal charging vehicle inlet 101 and the rapid charging vehicle inlet 102 are provided on the left side of the cabin 10 where the door 10A is located. In other words, since the normal charging vehicle inlet 101 and the rapid charging vehicle inlet 102 are provided on the same side as the cabin 10, the operator can visually confirm whether or not a charging connector 400 (an example of a charging mechanism) is connected to the normal charging vehicle inlet 101 or the rapid charging vehicle inlet 102 when entering the cabin 10.

[0105] In this embodiment, an example is described in which a normal charging vehicle inlet 101 and a rapid charging vehicle inlet 102 are provided on the left side of the upper rotating body 3. This is because, as shown in Figure 3, the cabin 10 is positioned to the left of the pivot center (axis) 3X of the upper rotating body 3, and a door 10A is provided on the left side of the cabin 10. In other words, the normal charging vehicle inlet 101 and the rapid charging vehicle inlet 102 are provided on the left side of the upper rotating body 3 in a position that is easily visible to workers entering and exiting through the door 10A. However, this embodiment is not limited to the example in which the normal charging vehicle inlet 101 and the rapid charging vehicle inlet 102 are provided on the left side of the cabin 10. For example, if the cabin provided on the upper rotating body is designed so that workers can enter and exit from both sides, the normal charging vehicle inlet 101 and the rapid charging vehicle inlet 102 may be provided on either of those two sides. In another example, if the cabin 10 is positioned off-center to the right of the pivot point (axis) 3X of the upper slewing body 3, and a door 10A is provided on the right side of the cabin 10, then a normal charging vehicle inlet 101 and a rapid charging vehicle inlet 102 may be provided on the right side of the upper slewing body 3. In this way, the normal charging vehicle inlet 101 and the rapid charging vehicle inlet 102 are provided based on the position of the cabin 10 where a door allowing workers to enter and exit is provided.

[0106] As mentioned above, charging the battery module 19 in the Shovel 200 takes time. For this reason, after connecting the charging connector 400 to the vehicle inlet 101 for normal charging and the vehicle inlet 102 for rapid charging, the operator may wait in the seat inside the cabin 10 until charging is complete.

[0107] If a vehicle charging inlet is located directly below the cabin door, the charging connector or cable connected to the vehicle charging inlet may obstruct the worker's entry into the cabin. Furthermore, a part of the worker's body may come into contact with the charging connector or its cable. In this case, the charging connector may become detached from the vehicle charging inlet.

[0108] Therefore, in the excavator 200 according to this embodiment, the vehicle inlet 101 for normal charging and the vehicle inlet 102 for rapid charging are located on the side of the upper rotating body 3 where the cabin 10 is provided, near the door 10A and behind the center of the bottom edge of the door 10A. As a result, when the worker opens the door 10A, the charging connector 400 and charging cable 401 are positioned so as to avoid the area near the center of the opened area, making it easier to get into the cabin 10.

[0109] The door 10A of the cabin 10 is rotatable in the rearward direction of the shovel 200, with hinges 10B and 10C as a reference. A retaining member 13 provided on the side of the shovel 200 holds a protruding member 10E provided on the door 10A of the cabin 10, thereby fixing the door 10A to the side. In this way, the door 10A of the cabin 10 can be fixed to the side of the upper rotating body 3. In other words, the door 10A of the cabin 10 can be fixed in a position rotated approximately 180 degrees. That is, when the door 10A of the cabin 10 is rotated in the rearward direction and fixed to the side of the upper rotating body 3, the rearward side can be seen from the cabin 10.

[0110] Therefore, when the door 10A is fixed to the side of the upper rotating body 3, the operator can check the normal charging vehicle inlet 101 and the rapid charging vehicle inlet 102 from inside the cabin 10 without being obstructed by the door 10A, and can confirm whether or not the charging connector 400 is connected to the normal charging vehicle inlet 101 or the rapid charging vehicle inlet 102. This prevents the start of work on the shovel 200 while the charging connector 400 is connected to the normal charging vehicle inlet 101 or the rapid charging vehicle inlet 102, thereby improving safety.

[0111] On the side of the cabin 10 where the normal charging vehicle inlet 101 and the rapid charging vehicle inlet 102 are located, there is 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 material.

[0112] Window 11C is positioned in an area that allows the operator to see downwards from the position where their head is located in the seat inside the cabin 10. The upper window 11A and the lower window 11B are located on the door 10A. Specifically, the upper window 11A and the lower window 11B are positioned to cover almost the entire area of ​​the door 10A.

[0113] Furthermore, the standard charging vehicle inlet 101 and the rapid charging vehicle inlet 102 are positioned so that when the charging connector 400 is connected, the charging connector 400 or charging cable 401 can be seen from the operator's perspective inside the cabin 10 through the upper window 11A, the lower window 11B, or the window 11C. This allows the operator to determine whether the charging connector 400 is connected to the standard charging vehicle inlet 101 or the rapid charging vehicle inlet 102, even when the cabin door 10A is closed. This prevents the start of work on the shovel 200 while the charging connector 400 is connected, thereby improving safety.

[0114] Furthermore, the standard charging vehicle inlet 101 and the rapid charging vehicle inlet 102 are located near the door 10A. Therefore, when the operator is in the cabin 10 and needs to remove the charging connector 400 from the standard charging vehicle inlet 101 or the rapid charging vehicle inlet 102, the operator can remove the charging connector 400 immediately after getting out of the cabin 10, thus reducing the burden on the operator, such as walking.

[0115] In the excavator 200 according to this embodiment, a standard charging vehicle inlet 101 and a rapid charging vehicle inlet 102 are provided in the space between the bottom 3B (swing frame) of the upper slewing body 3 and the floor surface 10D of the cabin 10. In other words, the standard charging vehicle inlet 101 and the rapid charging vehicle inlet 102 are provided at an ergonomically convenient height, thereby reducing the workload on the operator when connecting the charging connector 400. In this embodiment, this arrangement enables efficient use of the space within the excavator 200.

[0116] Incidentally, the shovel 200 according to this embodiment and the engine-powered shovel (hereinafter referred to as the engine-powered shovel 1500) are manufactured and sold as a series that uses common components (for example, the bottom 3B of the upper rotating body 3 and the cabin 10). By using common components, cost reductions can be achieved.

[0117] Figure 5 is an explanatory diagram showing the difference between the excavator 200 according to this embodiment and the engine-driven excavator 1500. As shown in Figure 5(A), in the engine-driven excavator 1500, the toolbox 1501 is configured to be stored in a position lower than the bottom of the door 10A, in other words, in the space between the bottom 3B and the floor of the cabin 10 (the first space).

[0118] As shown in Figure 5(B), in the excavator 200 according to this embodiment, a vehicle inlet for normal charging 101 covered by a first inner flap 151 and a vehicle inlet for rapid charging 102 covered by a second inner flap 152 are provided inside the outer flap 150, at a position lower than the bottom of the door 10A, in other words, in the space between the bottom 3B and the floor of the cabin 10 (the first space), as described above.

[0119] In the engine-powered excavator 1500 (an example of the first excavator), there is no need to provide a vehicle inlet 101 for normal charging and a vehicle inlet 102 for rapid charging. Therefore, in the excavator 200 (an example of the second excavator) according to this embodiment, the space where the vehicle inlet 101 for normal charging and the vehicle inlet 102 are provided (an example of the first space) is used as a space for storing a toolbox 1501 in the engine-powered excavator 1500. This makes effective use of space possible for both the excavator 200 and the excavator 1500.

[0120] Next, the space 153 after opening the outer flap 150 in the excavator 200 according to this embodiment will be described. Figure 6 is a diagram showing the arrangement of each component in the internal space 153 after opening the outer flap 150 according to this embodiment. As shown in Figure 6, in the internal space 153 after opening the outer flap 150, a first inner flap 151 and a second inner flap 152 are arranged. When the first inner flap 151 is opened, the vehicle inlet 101 for normal charging is exposed and connectable. When the second inner flap 152 is opened, the vehicle inlet 102 for rapid charging is exposed and connectable.

[0121] Furthermore, the space 153 is provided with an indicator 160 (an example of a display device) for indicating the charge level. The indicator 160 has, for example, three LEDs. The indicator 160 switches its display according to the charge level, according to 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 lit, the second LED is blinking, and the third LED is off. When the SOC is 75%, the first and second LEDs 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 or not it is OK to disconnect the charging connector 400 from the normal charging vehicle inlet 101 or the rapid charging vehicle inlet 102.

[0122] In other words, in this embodiment, indicators 160 are provided near the normal charging vehicle inlet 101 and the rapid charging vehicle inlet 102. Before the operator boards the cabin 10, they can not only check whether the charging connector 400 is connected to the normal charging vehicle inlet 101 or the rapid charging vehicle inlet 102, but also check the current SOC (state of charge) of the shovel 200. This allows the operator to determine whether or not to disconnect the charging connector 400 after checking the SOC. This reduces the burden on the operator before starting work with the shovel 200. Since the charging connector 400 can be disconnected after confirming that the SOC of the battery module 19 has reached a predetermined standard, it is possible to prevent a reduction in the working time of the shovel 200.

[0123] Furthermore, in this embodiment, the vehicle inlet 101 for normal charging, the vehicle inlet 102 for rapid charging, and the indicator 160 are located near the door 10A. Therefore, the walking distance is almost the same whether the operator checks the State of Charge (SOC) before boarding the cabin 10 or boards the cabin 10 directly. This reduces the walking burden when checking the SOC before boarding the cabin 10.

[0124] In this embodiment, an example was described using an indicator 160 with three LEDs as a display device for showing the charge level. However, this embodiment does not limit the display device to an indicator 160 with three LEDs; four or more LEDs, or two or fewer LEDs, may be used. Furthermore, a liquid crystal panel or the like may be used as the display device. In this way, any display device that can display the charge level may be used.

[0125] The embodiments described above are merely examples of the arrangement of the normal charging vehicle inlet 101 or the rapid charging vehicle inlet 102, and are not limited to this arrangement. For example, the normal charging vehicle inlet 101 or the rapid charging vehicle inlet 102 may be provided near the rear end of the side of the cabin 10 of the shovel 200. Even with this arrangement, the operator can check whether the charging connector 400 is connected when boarding. As yet another example, the normal charging vehicle inlet 101 or the rapid charging vehicle inlet 102 may be provided in front of the center of the bottom of the door 10A of the cabin 10 of the shovel 200. Even with this arrangement, the operator can check whether the charging connector 400 is connected when boarding. As another example, if there is a reason such as no operator or other person being in the cabin 10 of the shovel 200 while the charging connector 400 is connected, a normal charging vehicle inlet 101 and a rapid charging vehicle inlet 102 may be provided at a position approximately below the center of the bottom of the door 10A.

[0126] Furthermore, the charging vehicle inlet (an example of a charging port) provided on the shovel 200 is not limited to the example of providing two inlets, a normal charging vehicle inlet 101 and a rapid charging vehicle inlet 102, but may be provided as one inlet.

[0127] <effect> In the embodiment described above, a vehicle inlet 101 for normal charging and a vehicle inlet 102 for rapid charging are provided on the left side of the shovel 200. When the operator boards the shovel 200, they do so from the left side where the door 10A of the cabin 10 is located. Therefore, the operator can check whether the charging connector 400 is connected before boarding the shovel 200 without having to go around to the rear or right side of the shovel 200.

[0128] Furthermore, a standard charging vehicle inlet 101 and a rapid 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 (e.g., operator) connects the charging connector 400 to the inlet, they do not need to lift the charging connector 400 to a higher position, thus reducing the workload. Moreover, the standard charging vehicle inlet 101 and the rapid charging vehicle inlet 102 are located lower than the range of rotation of the door 10A. Therefore, even with the charging connector 400 connected, the worker can open the door 10A and board the cabin 10 while charging the battery module 19.

[0129] In this embodiment, a standard charging vehicle inlet 101 and a rapid 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 edge of the door 10A. Therefore, when a worker boards the cabin 10, the standard charging vehicle inlet 101 and the rapid charging vehicle inlet 102 do not obstruct boarding, making boarding easy. Furthermore, after the worker boards the cabin 10, they can visually check whether the charging connector 400 is connected by opening the door 10A or through the window 11C, etc. Therefore, it is possible to prevent the worker from operating the shovel 200 while the charging connector 400 is connected.

[0130] Furthermore, the shovel 200 may be controlled to not operate if the charging connector 400 is connected to the standard charging vehicle inlet 101 or the rapid charging vehicle inlet 102. In such a case, if the operator attempts to operate the shovel 200 from inside the cabin 10 and the shovel 200 does not operate, they can visually confirm whether the charging connector 400 is connected without having to get out of the cabin 10. This improves safety.

[0131] Although embodiments have been described in detail above, this disclosure is not limited to these specific embodiments, and various modifications and changes are possible within the scope of the gist described in the claims. [Explanation of Symbols]

[0132] 200 Shovel 1. Lower running body 2. Swivel mechanism 3. Upper rotating body 3B Bottom 4 Boom 5 Arms 6 buckets 7 Boom Cylinder 8 Arm Cylinder 9 Bucket Cylinder 10 cabins 10A Door 10B, 10C hinges 10D floor surface 11A Upper window 11B Lower window 11C Window 12 Electric motors for pumps 14 Main pump 19 Battery Modules 191 Battery Controller 192 batteries 30 Shovel Controller 101 Vehicle inlet for standard charging 102 Vehicle inlet for rapid charging 103 AC-DC converter for charging 150 Outer flap 151 First Inner Flap 152 Second inner flap 154, 155, 156 Cables

Claims

1. The upper rotating body and The electric motor mounted on the upper rotating body, To supply power to the aforementioned electric motor, a battery mounted on the upper rotating body, A cabin mounted on the upper rotating body, The cabin is provided with an openable and closable door, It has a charging port that can be connected to a charging mechanism that supplies power to the battery from an external power source, At least a portion of the side surface of the cabin on the side where the charging port is located is formed of a transparent material. The charging port is located on the surface of the upper rotating body on which the door is provided, at a position lower than the bottom edge of the door, and is positioned such that when the charging mechanism connected to the charging port is connected, the charging mechanism or its cable can be seen from a viewpoint inside the cabin through the area formed by the transparent member. Electric excavator.

2. The charging port is further provided on the surface of the upper rotating body on which the door is provided, near the door and behind the center of the bottom edge of the door. The electric excavator according to claim 1.

3. The door is provided so as to be able to rotate in the rearward direction of the electric excavator and be fixed to the side of the upper rotating body. The electric excavator according to claim 1 or 2.

4. The charging port is located between the bottom of the upper rotating body and the floor of the cabin. An electric excavator according to any one of claims 1 to 3.

5. A display device indicating the battery's charge level is provided near the charging port. An electric shovel according to any one of claims 1 to 4.

6. The aforementioned battery is mounted on the right front part of the upper rotating body, The charging port is located on the left side of the upper rotating body and is connected to the battery by a power line. An electric shovel according to any one of claims 1 to 5.

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