Power supply mechanism

Abstract

To provide a power supply mechanism for an electric work machine that can cut off current to a main device while suitably maintaining current supply to other devices.SOLUTION: A power supply mechanism of an electric work machine comprises a high-voltage main power supply unit 11 and a low-voltage secondary power supply unit 12, and is configured to be able to operate in a high-voltage power supply mode in which power is supplied from the main power supply unit 11 to a main device (motor 15), and a low-voltage power supply mode in which power supply from the main power supply unit 11 to the main device is stopped and power is supplied from the secondary power supply unit 12 to devices other than the main device.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a mechanism for controlling the supply of electricity to each device mounted on an electrically operated work machine. [Background technology]

[0002] In recent years, electrically driven motor vehicles (EVs) have become increasingly popular, partially replacing fossil fuel-powered engine vehicles. A similar trend is also occurring in the field of work machinery such as excavators and crawler carriers, with various companies developing and putting into practical use electric vehicles that use electricity to run their running bodies and to drive other equipment (see, for example, Patent Documents 1 and 2 listed below). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2024-279 [Patent Document 2] Japanese Patent Application Publication No. 2023-160539 Summary of the Invention [Problem to be solved by the invention]

[0004] Such electric work machines (hereinafter referred to as "electric work machines" or the like in this specification) are provided with a mechanism for controlling the flow of electricity, such as a mechanism called a gate lock lever. The gate lock lever is provided next to the driver's seat of the vehicle and can be raised and lowered integrally with levers for operating the vehicle by rotating relative to the driver's seat, and its movement is linked to the supply and cut-off of electricity to the electrical circuits. In other words, electricity can be supplied from the battery installed in the vehicle to each device only when the gate lock lever is lowered, and when the gate lock lever is raised, the circuit between the battery and the devices is opened, cutting off the electricity.

[0005] However, if such a power / shutdown switching mechanism only allows the user to select whether to power or cut off each device from the battery, it is anticipated that there will be some inconveniences. For example, when using an electric work machine to perform work such as excavation, it is desirable to stop the motor to conserve power and reduce unnecessary power consumption caused by the hydraulic pump running. However, if the user lifts the gate lock lever to cut off the power, the power supply to other devices will also be cut off, causing, for example, the work lights and horn to become unusable or the cooling fan to stop operating. When using an electric work machine, there may be situations where it is desirable to cut off the power to some devices while maintaining the power supply to others. Therefore, it is desirable for the electric work machine to have a power supply mechanism that can handle such situations.

[0006] In view of the above circumstances, the present invention aims to provide a current supply mechanism for an electric work machine that can cut off the power supply to a main device while suitably maintaining the power supply to other devices. [Means for solving the problem]

[0007] The present invention relates to a current supply mechanism for an electric work machine, which is configured to be switchable between a high-voltage current supply mode in which high-voltage power is supplied to major equipment that requires high-voltage power supply among the onboard equipment, and a low-voltage current supply mode in which power supply to the major equipment is stopped and low-voltage power is supplied to equipment other than the major equipment.

[0008] The current supply mechanism for an electric work machine of the present invention is characterized in that it comprises a high-voltage main power supply unit and a low-voltage secondary power supply unit, and is configured so that in a high-voltage current supply mode, power is supplied from the main power supply unit to major equipment, while in a low-voltage current supply mode, power is supplied from the secondary power supply unit to equipment other than the major equipment.

[0009] In the power supply mechanism of the electric work machine of the present invention, the main equipment that receives power from the main power supply unit in the high-voltage power supply mode can include a motor that drives at least one of the running body, the swivel base, and the working unit.

[0010] The current supply mechanism of the electric work machine of the present invention may be configured to include a gate lock mechanism that switches between an on state in which operation is possible using an operating device provided in the driver's seat and an off state in which operation using the operating device is restricted, and to switch between the high-voltage current supply mode and the low-voltage current supply mode in accordance with the switching between the on state and the off state of the gate lock mechanism.

[0011] The energization mechanism of the electric operating machine of the present invention may be configured to switch between the high-voltage energization mode and the low-voltage energization mode on the condition that no operation input is made to an operating device provided in the driver's seat. [Effects of the Invention]

[0012] The current supply mechanism for an electric operating machine of the present invention has the excellent effect of cutting off current to major devices while maintaining current supply to other devices in an appropriate manner. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a side view showing an example of the configuration of an electric working machine (shovel) to which the present invention is applied. [Figure 2] 2 is a side view showing an example of a gate lock mechanism provided in the electric operating machine of FIG. 1. FIG. [Figure 3] 2 is a simplified diagram showing an example of an electric circuit provided in the electric operating machine of FIG. 1. FIG. [Figure 4] FIG. 4 is a diagram showing an example of a current-carrying state in the circuit shown in FIG. 3, showing a state when the starter switch is off. [Figure 5] FIG. 4 is a diagram showing another example of a current-carrying state in the circuit shown in FIG. 3, showing a state in which the starter switch is on and the power supply changeover switch is on. [Figure 6] FIG. 4 is a diagram showing yet another example of the energization state in the circuit shown in FIG. 3, showing the state when the starter switch is on and the power supply changeover switch is off. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

[0015] FIG. 1 shows an example of a configuration of an excavator as an electric work machine to which the present invention is applicable. The excavator 1 has a crawler-type running body 3 attached to the bottom of a vehicle body 2, and a frame constituting the vehicle body 2 is rotatably attached to the running body 3 via a swivel 5. A driver's seat 6 is provided at the top of the vehicle body 2, and an arm 7, which serves as a working unit (a part that performs the functions of an electric work machine, such as excavating, crushing, and transporting), is attached to the front. Power supplies (main power supply unit 11 and auxiliary power supply unit 12, described below; not shown in FIG. 1) are housed at appropriate positions on the vehicle body 2 and supply power to a motor (not shown in FIG. 1) that drives a hydraulic pump (not shown) and other onboard equipment. The hydraulic pump pumps oil to a hydraulic circuit (not shown) that operates the arm 7, drives the running body 3, and rotates the vehicle body 2 using the swivel 5.

[0016] A gate lock mechanism 8, as shown in FIG. 2, is provided on the side (left side) of the driver's seat 6. The gate lock mechanism 8 shown here has an operating lever 9 attached to the upper part as part of the operating device provided on the driver's seat 6, and a switching lever 10 protruding forward from the lower part. The gate lock mechanism 8 is rotatable about a rotation axis provided along the left-right direction relative to the driver's seat 6, and the raising and lowering operation of this gate lock mechanism 8 is linked to the hydraulic circuit (not shown). That is, when the gate lock mechanism 8 is lowered, hydraulic pressure can be input to the hydraulic circuit that operates devices such as the running platform 3, swivel base 5, and arm 7 by operating the operating lever 9. However, when the gate lock mechanism 8 is raised, the connection between the operating lever 9 and the hydraulic circuit is cut off, and the operating input from the operating lever 9 to the hydraulic circuit is turned off, preventing the operating lever 9 from operating the devices operated by the hydraulic circuit (the arm 7, running platform 3, and swivel base 5).

[0017] Furthermore, in this embodiment, the operation of this gate lock mechanism 8 is linked to the on / off of current in an electric circuit (see FIGS. 3 and 4) described below by a mechanism not shown. That is, when the gate lock mechanism 8 is closed as shown by the solid line in FIG. 2 and operation input to the hydraulic circuit (not shown) by the operating lever 9 is possible (referred to as the "on state"), the corresponding contacts in the electric circuit are closed, and when the gate lock mechanism 8 is open as shown by the dashed line in FIG. 2 and operation input to the hydraulic circuit by the operating lever 9 is restricted (referred to as the "off state"), the contacts in the electric circuit are open. The gate lock mechanism 8 can be operated by manually gripping the switching lever 10 and moving it up and down.

[0018] Fig. 3 shows this electric circuit (a circuit for supplying power to each mounted device) provided in the shovel 1. Note that the circuit shown in Fig. 3 shows a schematic configuration of the circuit for the purpose of explaining this embodiment, and is not an accurate electric circuit diagram. The same applies to Figs. 4 to 6.

[0019] The shovel 1 is equipped with a high-voltage main power supply unit 11 and a low-voltage secondary power supply unit 12 as power supply units. Both the main power supply unit 11 and the secondary power supply unit 12 are rechargeable batteries, and the main power supply unit 11 is configured as a battery with a higher voltage and larger capacity than the secondary power supply unit 12, and as will be described later, is capable of supplying power to the motor 15, which is a major device that requires a high voltage for operation, as well as to other devices that operate at a relatively low voltage, among the devices mounted on the shovel 1. The secondary power supply unit 12 has a lower voltage and smaller capacity than the main power supply unit 11, and supplies power to devices other than the motor 15, which is a major device, as needed. Hereinafter, in this specification, for convenience, a state in which power is supplied from the high-voltage main power supply unit 11 to the major device (here, the motor 15 is assumed as the major device) will be referred to as a "high-voltage conduction mode," and a state in which power supply from the main power supply unit 11 to the major device is stopped and low-voltage power is supplied to devices other than the major device will be referred to as a "low-voltage conduction mode." The high-voltage current supply mode does not only refer to a mode in which current is supplied only to the main equipment that operates at high voltage, but also to other equipment that operates at low voltage as needed, in addition to the main equipment. This also falls under the category of "high-voltage current supply mode."

[0020] Here, the terms "high voltage" and "low voltage" used in this specification are not defined by specific values ​​such as a certain volts or more or less than a certain volts, but are merely terms that relatively describe the difference in voltage between the power supply devices when there is a mechanism such as the electric work machine 1 that is equipped with multiple power supply devices with different supply voltages. In other words, a high-voltage power supply device is a power supply device that can supply power at a higher voltage than other power supply devices, and a low-voltage power supply device is a power supply device that can supply power at a lower voltage than high-voltage power supply devices.

[0021] Furthermore, the term "major equipment" can also refer to equipment that performs the main functions required of the electric work machine 1, such as an excavator (e.g., operation of the arm 7, travel by the traveling body 3, and rotation of the vehicle body 2 by the swivel 5). However, specifically for the purposes of this specification, the term "major equipment" refers to equipment that requires a relatively high voltage for operation in an electric work machine 1 equipped with a mechanism for supplying power at different voltages to each device, as described above. That is, in this embodiment, the "major equipment" refers to the motor 15 that drives the arm 7, traveling body 3, and swivel 5, which are the working units. In an electric work machine 1 that is a traveling excavator, a high voltage is particularly required for operation of the motor 15 that drives these mechanisms. Therefore, treating the motor 15 as a major equipment to which power is supplied in the high-voltage mode makes it particularly convenient to switch between the high-voltage mode and the low-voltage mode. Of course, depending on the type and configuration of the electric work machine, there may be "major equipment" of a different type and mechanism than the "major equipment" exemplified here, and one electric work machine may be equipped with multiple devices each with a different function as "major equipment."

[0022] In addition, in this specification, equipment other than "main equipment" refers to equipment that can operate without high-voltage power supply from the main power supply unit, by reducing the voltage via a converter, or by using relatively low-voltage power supply from a secondary power supply unit.

[0023] The power supply path shown in Fig. 3 will now be described in more detail. Main power supply 11 is connected to an external power source via a charger and is charged from the external power source. A converter 13, which is a step-down converter, is provided between main power supply 11 and secondary power supply 12, and current is supplied from main power supply 11 to secondary power supply 12 via converter 13, allowing main power supply 11 to charge secondary power supply 12.

[0024] The secondary power supply unit 12 is capable of supplying power to some of the devices provided in the electric work machine 1 that do not require high voltage for operation (devices other than the main devices: control device 16, motor controller 17, battery controller 19, work operation device 20, lighting device 22, and cooling-related devices 23). In addition to these, the main power supply unit 11, which is a high-voltage power source, is also capable of supplying power to the motor 15, which is a main device, via an inverter 14. Power can be supplied from the main power supply unit 11 to the motor 15 at high voltage without going through the converter 13, which is a step-down converter. Power is supplied from the main power supply unit 11 to the other devices at low voltage via the converter 13.

[0025] A high-voltage, large-capacity main power supply 11 is connected to an electric motor 15 via an inverter 14. The motor 15 is connected to the hydraulic pump (not shown) for driving the running body 3 and arm 7 of the excavator 1; that is, the main power supply 11 supplies the motor 15 with electric power for driving the running body 3, swivel base 5, and arm 7.

[0026] 3, in addition to inverter 14 and motor 15, various devices are connected, such as control device 16, motor controller 17, battery controller 19, operation operating device 20, lighting device 22, and cooling-related device 23. The circuit also incorporates a fuse box 24, a starter switch 25, and other switches and relays (not shown) as appropriate, so that power can be supplied from the power supply devices (main power supply device 11 and secondary power supply device 12) to these devices as needed, and the electrical connections between each device can be switched as appropriate.

[0027] In addition, various devices and mechanisms (not shown) may be connected to or incorporated into the circuit as needed, but parts that are not directly related to the gist of the present invention are omitted from the illustration as appropriate.

[0028] The control device 16 is a controller that monitors and controls the operation of each device mounted on the excavator 1, including the motor 15. In the present embodiment, the control device 16 is equipped with a display (display unit 16a) that is installed in the driver's seat 6, and the operating status of each device and the like grasped by the control device 16 are displayed appropriately on the display unit 16a.

[0029] Motor controller 17 is an operating device such as an operating knob for adjusting the rotation speed of motor 15, and the operation of motor controller 17 is input as an operation signal to control device 16, which controls motor 15 in response to this. Hour meter 18 is a device that accumulates the operating time of motor 15, and the operating time of motor 15 measured and calculated by hour meter 18 is displayed on display unit 16a as necessary.

[0030] The battery controller 19 is a so-called BMS (battery management system) that controls the main power supply 11, which is composed of a collection of many battery cells, and controls the operating state of the main power supply 11 in accordance with a control signal input from the control device 16.

[0031] The work operating device 20 is a controller for inputting operations to the arm 7, which is a working part that performs work such as excavation, and other devices in the electric work machine 1, which is a work machine such as a shovel.

[0032] The lighting device 22 is an electric light, such as a work light or a warning light, provided on the vehicle body 2.

[0033] The cooling-related devices 23 are devices for cooling devices such as the motor 15, and are, for example, fans and pumps that drive cooling water.

[0034] Appropriate fuses are installed in the paths connecting the main power supply unit 11 and the secondary power supply unit 12 to the above-mentioned devices, and these fuses are stored together in a fuse box 24. In addition, a starter switch 25 is provided between the main power supply unit 11 and the secondary power supply unit 12 and devices such as the battery controller 19, the work operation device 20, the lighting device 22, and the cooling-related devices 23, so that the power supply from the main power supply unit 11 or the secondary power supply unit 12 to these devices can be turned on and off using a starter key (not shown) of the electric work machine 1.

[0035] The circuit shown in Fig. 3 is provided with a power supply selector switch 27 that operates in conjunction with the gate lock mechanism 8 shown in Fig. 2. This power supply selector switch 27 inputs an operation signal to the control device 16 depending on the state (on or off) of the gate lock mechanism 8, and the control device 16 switches the power supply of the circuit between the main power supply 11 and the secondary power supply 12 in response to this signal. That is, when the gate lock mechanism 8 is in the on state, high-voltage power supply from the main power supply 11 via the inverter 14 is enabled to drive the motor 15, and power reduced in voltage via the converter 13 is supplied to other devices (high-voltage power supply mode). On the other hand, when the gate lock mechanism 8 is in the off state, power supply from the inverter 14 to the motor 15 is prohibited. As a result, operation of the arm 7, traveling body 3, and swivel base 5 is disabled, but power is supplied to other devices (such as the control device 16, battery controller 19, lighting device 22, and cooling-related devices 23) (low-voltage power supply mode).

[0036] The operation of the above-described embodiment will now be described.

[0037] In this embodiment, the on / off of the entire current supply is controlled by switching the starter switch 25, and when the starter switch 25 is on, the power supply changeover switch 27 switches between a high voltage current supply mode and a low voltage current supply mode.

[0038] Fig. 4 shows the state when starter switch 25 is off, Fig. 5 shows the state in the high-voltage current mode, and Fig. 6 shows the state in the low-voltage current mode. In Figs. 4 to 6, among the electrical paths connecting various parts, the parts that are energized are shown with solid lines, and the parts that are not energized are shown with dashed lines. Note that Figs. 4 to 6 omit illustrations of the connection parts to the charger and external power source, and the paths related to the power supply from these.

[0039] When the starter switch 25 is in the OFF state, power supply from the main power supply 11 to the secondary power supply 12 is turned off, and power supply to the control device 16, motor controller 17, work operating device 20, and cooling-related equipment 23 downstream of the starter switch 25 is also turned off (power supply to a horn and other devices not shown is also turned off). Power supply from the inverter 14 to the motor 15 is also cut off, and these devices cannot operate. However, power is supplied from the secondary power supply 12 to the battery controller 19, and power stored in the secondary power supply 12 is supplied to the battery controller 19. Power supply between the battery controller 19 and the main power supply 11 and inverter 14 is also turned on.

[0040] When the power is off, the electric work machine 1 is in a standby state in this way, with current supplied from the secondary power supply 12 to the battery controller 19 maintained, and when the power is turned on by operating the starter switch 25, the battery controller 19 is turned on using the power supplied from the secondary power supply 12, and the function of the battery controller 19 turns on current supplied from the main power supply 11 to the motor 15, starting the motor 15. In other words, the electric work machine 1 of this embodiment is originally provided with the secondary power supply 12 as a power source for starting the motor 15, which is the main device, from a standby state with the power off, and is configured to use this as a power source in a low-voltage current supply mode, as will be described later.

[0041] The state in which the power supply is turned on by operating the starter switch 25 is shown in Figures 5 and 6. When the starter switch 25 is on and the gate lock mechanism 8 (see Figures 1 and 2) is on, a signal (indicated by a dashed arrow) is input from the power supply selector switch 27 to the control device 16 as shown in Figure 5, and in response to this signal, the control device 16 inputs a signal (indicated by a dashed arrow) to the inverter 14 that permits the supply of electricity from the main power supply 11 to the motor 15. As a result, high-voltage power is supplied from the main power supply 11 to the motor 15, and low-voltage power is also supplied to other devices via the converter 13 (high-voltage current supply mode).

[0042] When the starter switch 25 is in the on state and the gate lock mechanism 8 (see FIGS. 1 and 2) is turned off, the signal input from the power supply selector switch 27 to the control device 16 is turned off, as shown in FIG. 6. In response to this, the control device 16 prohibits the supply of electricity from the inverter 14 to the motor 15. As a result, the operation of the motor 15 stops, but low-voltage power is supplied from the secondary power supply device 12 to the other devices, allowing these devices to continue operating (low-voltage current supply mode).

[0043] Work using the electric work machine 1 is generally performed in high-voltage mode (see FIG. 5). However, if work needs to be interrupted for a short period of time, the switch lever 10 can be raised to turn off the gate lock mechanism 8 (see FIGS. 1 and 2). This switches the circuit to low-voltage mode, cutting off the high-voltage power supply from the main power supply 11 and disabling the motor 15 (see FIG. 6). However, in low-voltage mode, low-voltage power is supplied from the secondary power supply 12 to devices other than the motor 15, allowing the lighting device 22 and cooling-related devices 23 to operate. In this state, the motor 15 is stopped, preventing the hydraulic pump (not shown) connected to the motor 15 from generating drag torque, thereby reducing energy waste due to drag torque. Meanwhile, the cooling-related devices 23 and other devices can operate using power supplied from the secondary power supply 12, allowing the motor 15 and other devices requiring cooling to continue to be cooled. Other devices that can operate using power supplied from the secondary power supply 12 can be operated as needed. When the switching lever 10 is lowered to turn on the gate lock mechanism 8 (see Figures 1 and 2), the system switches back to the high voltage power supply mode, and power is supplied from the main power supply unit 11 to the motor 15 and other devices (see Figure 5).

[0044] When work using the electric work machine 1 is to be finished, the starter switch 25 is operated to turn off the power supply, and power supply from both the main power supply device 11 and the secondary power supply device 12 is cut off (see FIG. 4).

[0045] The above-described interlocking of the gate lock mechanism 8 with the electric circuit (switching of the current supply mode according to the state of the gate lock mechanism 8) can be achieved by various mechanisms. For example, it is possible to provide a physical switch or an electromagnetic sensor that detects the open / closed state of the gate lock mechanism 8, thereby allowing the control device 16 to grasp the open / closed state of the gate lock mechanism 8. Alternatively, a mechanism is also conceivable in which the control device 16 monitors changes in oil pressure in a hydraulic circuit (not shown) that accompany the opening and closing of the gate lock mechanism 8.

[0046] Furthermore, instead of being performed by the gate lock mechanism 8, the switching of the power supply mode may be performed based on the presence or absence of an operational input to the electric work machine 1. For example, if there is no operational input to an operating device such as the control lever 9 for a certain period of time while the electric work machine 1 is in operation, the high-voltage power supply from the main power supply 11 via the inverter 14 is prohibited, the motor 15 is stopped, and power is supplied to other devices from the secondary power supply 12. In this case, for example, the control device 16 may monitor the hydraulic input to a hydraulic circuit (not shown) from an operating device such as the control lever 9, and switch the power supply as described above when the duration of the no-input state reaches a certain threshold. Alternatively, the presence or absence of an operational input to the control lever 9 or the like may be monitored electrically or physically using some kind of sensor. Alternatively, if each device is controlled by electrical control instead of a hydraulic circuit, the control device 16 may directly monitor the presence or absence of an electrical signal input from the control lever 9 or the like. If an operation input to the operating lever 9 or the like is detected while the secondary power supply unit 12 is supplying power in the low-voltage current supply mode, the power supply unit is switched again and power supply in the high-voltage current supply mode by the main power supply unit 11 is resumed.

[0047] In addition, the switching of the power supply device based on the state of the gate lock mechanism 8 may be combined with the switching of the power supply based on whether or not there is input to the operating device (operating lever 9), and the power supply device may be switched as described above when at least one of the following conditions is met, for example, during operation using the electric work machine 1: the gate lock mechanism 8 is turned off, or there is no operating input to the operating lever 9 for a certain period of time or more.

[0048] Furthermore, in the above embodiment, it is assumed that in the high-voltage conduction mode, power is supplied from the main power supply 11 to the major equipment (motor 15) and all other equipment shown in FIG. 3 , and in the low-voltage conduction mode, power is supplied from the secondary power supply 12 to equipment other than the major equipment. However, the specifics of how to use the high-voltage conduction mode and the low-voltage conduction mode are not limited to the examples described here. For example, it is theoretically possible to operate some or all of the equipment other than the major equipment using power supplied from the secondary power supply 12 rather than the main power supply 11 in both the high-voltage conduction mode and the low-voltage conduction mode. Alternatively, in the low-voltage conduction mode, it is also conceivable that power is supplied from the main power supply 11 via the converter 13 to some or all of the equipment other than the major equipment, instead of from the secondary power supply 12.

[0049] As described above, the current supply mechanism of the electric work machine of this embodiment is configured to be switchable between a high-voltage current supply mode in which high-voltage power is supplied to the main equipment (motor 15) that requires high-voltage power supply among the onboard equipment, and a low-voltage current supply mode in which power supply to the main equipment 15 is stopped and low-voltage power is supplied to equipment other than the main equipment 15. In this way, power can be supplied to other equipment even when power supply to the main equipment is stopped.

[0050] The current supply mechanism of the electric work machine of this embodiment includes a high-voltage main power supply 11 and a low-voltage secondary power supply 12, and is configured to be able to operate in a high-voltage current supply mode in which power is supplied from the main power supply 11 to the main equipment (motor 15), and in a low-voltage current supply mode in which power supply from the main power supply 11 to the main equipment is stopped and power is supplied from the secondary power supply 12 to equipment other than the main equipment. In this way, current can be supplied in the low-voltage current supply mode using the secondary power supply 12.

[0051] Furthermore, in the current supply mechanism of the electric working machine of this embodiment, the main devices that receive power from the main power supply 11 in the high-voltage current supply mode include a motor 15 that drives at least one of the traveling body 3, the swivel base 5, and the working unit (arm) 7. In this way, the above-mentioned operational effects can be suitably obtained in the electric working machine 1 equipped with the electric motor 15.

[0052] In addition, the current supply mechanism of the electric work machine of this embodiment is provided with a gate lock mechanism 8 that switches between an on state that allows operation using an operating device (operating lever) 9 provided in the driver's seat 6, and an off state that restricts operation using the operating device 9, and the high voltage current supply mode and the low voltage current supply mode can be switched in accordance with the switching between the on state and the off state of the gate lock mechanism 8.

[0053] In addition, the power supply mechanism of the electric work machine of this embodiment can also be configured to switch between the high voltage power supply mode and the low voltage power supply mode on the condition that there is no operation input to the operating device (operating lever) 9 provided in the driver's seat 6.

[0054] Therefore, according to the present embodiment, it is possible to preferably maintain power supply to other devices while cutting off power supply to the main devices.

[0055] The current-carrying mechanism for the electric working machine of the present invention is not limited to the above-described embodiment. For example, in the above embodiment, a swing-type shovel is used as an example of the electric working machine, but the present invention is not limited to this and can be applied to various types of electric working machines. Of course, various modifications can be made to the present invention without departing from the scope of the present invention. [Explanation of symbols]

[0056] 1. Electric work equipment (shovel) 3. Running body 5 Swivel table 6 Driver's seat 7 Working part (arm) 8 Gate lock mechanism 9 Operating device (operating lever) 11 Main power supply 12 Sub power supply 15 Main equipment (motor)

Claims

1. A high-voltage power supply mode supplies high voltage to the main onboard equipment that requires high-voltage power supply. A low-voltage power supply mode is configured to be switchable between a low-voltage power supply mode in which power supply to the main equipment is stopped and a low-voltage power supply mode in which power supply to equipment other than the main equipment is stopped. The current-carrying mechanism of an electric work machine is characterized by the above.

2. A high-voltage main power supply unit and a low-voltage auxiliary power supply unit are provided. In the high voltage power supply mode, power is supplied from the main power supply to the main equipment, In the low voltage conduction mode, the secondary power supply unit is configured to supply power to devices other than the primary device.

2. The current supply mechanism for an electric operating machine according to claim 1.

3. The main equipment includes a motor that drives at least one of the traveling body, the swivel base, and the working unit.

2. The current supply mechanism for an electric operating machine according to claim 1.

4. a gate lock mechanism that switches between an ON state in which operation by an operating device provided in the driver's seat is possible and an OFF state in which operation by the operating device is restricted; The high-voltage conduction mode and the low-voltage conduction mode are switched in response to the switching between the on state and the off state of the gate lock mechanism.

2. The current supply mechanism for an electric operating machine according to claim 1.

5. The switching between the high voltage conduction mode and the low voltage conduction mode is performed on the condition that there is no operation input to an operating device provided in the driver's seat.

2. The current supply mechanism for an electric operating machine according to claim 1.

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