Electric construction machinery

Abstract

To prevent a power supply cable from being connected to a power supply port with a cover open.SOLUTION: An upper structure 3 comprises: a counterweight 7; a battery 16; and a power supply port 23 to which a power supply cable 25 extending from an external power source is connected. The counterweight 7 includes: an inspection opening 7C for inspecting the battery 16; and a battery cover 8 capable of moving between an open position where the inspection opening 7C is opened to expose the battery 16 to an outside and a close position where the inspection opening 7C is closed to cover the battery 16. When the battery cover 8 is in the open position, the battery cover 8 prevents a work of connecting the power supply cable 25 to the power supply port 23.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present disclosure relates to an electric construction machine such as a hydraulic excavator equipped with an electric motor as a power source.

Background Art

[0002] A hydraulic excavator, which is a representative example of a construction machine, includes a self-propelled lower traveling body, an upper revolving body rotatably mounted on the lower traveling body via a slewing device, and a working device provided on the front side of the upper revolving body. In recent years, as a measure to suppress global warming and air pollution, an electric hydraulic excavator using an electric motor as a power source has been put into practical use. This electric hydraulic excavator drives a hydraulic pump with an electric motor to supply hydraulic oil for operation to a hydraulic actuator.

[0003] There is known an electric hydraulic excavator that includes an electric motor, a battery, and a charger as power sources and drives the electric motor with electric power from the battery. In an electric hydraulic excavator equipped with a battery, it is necessary to appropriately supply (charge) electric power from an external power source to the battery via a charger. For this reason, an electric hydraulic excavator is provided with a power supply port for connecting a power supply cable extending from an external power source.

[0004] As a conventional electric hydraulic excavator, there has been proposed one including a power supply port to which a power supply cable from an external power source is connected, a charge start switch for instructing the start of a charging operation, and a charge end switch for instructing the end of a charging operation. This electric hydraulic excavator is configured such that a charging operation for the battery is started by operating the charge start switch with the power supply cable connected to the power supply port, and the charging operation ends by operating the charge end switch (see Patent Document 1).

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

[0006] However, in electric hydraulic excavators using conventional technology, the power feed port is located on the lower left side of the exterior cover attached to the upper rotating body, making it difficult to see whether the power feed cable is connected to the power feed port. As a result, there is a risk that an operator may accidentally come into contact with the battery inside the vehicle when inspecting the vehicle interior, including inspecting the battery, without realizing that the battery mounted on the vehicle is being charged.

[0007] An object of the present invention is to provide an electric construction machine that can prevent a power supply cable from being inadvertently connected to a power supply port when the cover is open. [Means for solving the problem]

[0008] The present invention provides A battery that is disposed inside the vehicle body and supplies power to an electric motor serving as a power source, and for supplying power to the battery A power supply port to which the power cable extending from an external power source is connected and In an electric construction machine equipped with the said Inside the car outside where exposure the battery is disposed, for inspecting the battery In order to for inspection an opening; for inspection an open position in which the opening is opened; for inspection The device is provided with a cover that is movable between a closed position that closes the opening and a closed position that closes the opening, and when the cover is in the open position, it prevents the power supply cable from being connected to the power supply port. [Effects of the Invention]

[0009] According to the present invention, it is possible to prevent the power supply cable from being inadvertently connected to the power supply port when the cover is open. [Brief explanation of the drawings]

[0010]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Mode for Carrying Out the Invention

[0011] Hereinafter, taking the case where the electric construction machine according to the embodiment of the present invention is applied to an electric hydraulic excavator as an example, it will be described in detail with reference to FIGS. 1 to 7. In the embodiment, the traveling direction of the electric hydraulic excavator is defined as the front-rear direction, and the direction orthogonal to the traveling direction is defined as the left-right direction for explanation.

[0012] An electric hydraulic excavator 1 representing an electric construction machine includes a crawler-type lower traveling body 2 capable of self-traveling in the front-rear direction, and an upper revolving body 3 rotatably mounted on the lower traveling body 2. The vehicle body of the electric hydraulic excavator 1 is composed of the lower traveling body 2 and the upper revolving body 3. A swing-type working device 4 is provided on the front side of the upper revolving body 3, and earth and sand excavation work and the like are performed using this working device 4.

[0013] The swing-type working device 4 has a swing post 4A provided on the front side of a slewing frame 5, which will be described later, so as to be swingable in the left-right direction. A boom 4B is rotatably attached to the swing post 4A, an arm 4C is rotatably attached to the tip of the boom 4B, and a bucket 4D is rotatably attached to the tip of the arm 4C. Further, the working device 4 includes a swing cylinder (not shown) for swinging the swing post 4A, a boom cylinder 4E for rotating the boom 4B, an arm cylinder 4F for rotating the arm 4C, and a bucket cylinder 4G for rotating the bucket 4D.

[0014] The upper slewing body 3 is mounted on the lower traveling body 2 via a slewing device so as to be slewingable and performs a slewing operation on the lower traveling body 2. The upper slewing body 3 includes a slewing frame 5 serving as a base. The slewing frame 5 is mounted with a cab 6, a counterweight 7, an electric motor 14, a hydraulic pump 15, a battery 16, an exterior cover 20, etc.

[0015] The cab 6 is arranged on the left side of the slewing frame 5. The cab 6 is formed in a box shape surrounded by a front surface 6A, a rear surface 6B, a left side surface 6C, a right side surface 6D, and an upper surface 6E, and forms a driver's cab in which an operator rides. Inside the cab 6, a driver's seat for the operator to sit on, a traveling lever pedal for controlling the traveling of the lower traveling body, a working operation lever for controlling the slewing operation of the upper slewing body 3 and the operation of the working device 4 (none of which are shown) are provided.

[0016] The counterweight 7 is located behind the cab 6 and provided at the rear end of the slewing frame 5. The counterweight 7 maintains the weight balance with the working device 4. The rear surface 7A of the counterweight 7 has an arc shape in which the central portion in the left-right direction protrudes rearward. Thereby, when the upper slewing body 3 slews, the rear surface 7A of the counterweight 7 is configured to be within a certain slewing radius.

[0017] The counterweight 7 rises upward from the rear end of the swivel frame 5 and covers the battery 16 etc. from the rear. At the upper end of the counterweight 7, an overhanging portion 7B that projects forward is formed, and the rear side of the cab 6 is supported by this overhanging portion 7B. Further, a power supply port 23 described later is provided on the left end side of the overhanging portion 7B, and a cable support device 27 described later is provided on the right end side of the overhanging portion 7B.

[0018] An inspection opening 7C is provided in the central portion of the counterweight 7. The inspection opening 7C is composed of a rectangular hole whose horizontal dimension is set larger than its vertical dimension, and penetrates the counterweight 7 in the front-rear direction. The inspection opening 7C is covered in an openable manner by a battery cover 8 described later. The inspection opening 7C is opened by setting the battery cover 8 to the open position (the positions in FIGS. 5 and 6), and an operator performs an inspection operation on the battery 16 etc. through the inspection opening 7C.

[0019] The battery cover 8 is attached to the counterweight 7 using a link mechanism 9 described later. The battery cover 8 is formed of a rectangular plate body larger than the inspection opening 7C of the counterweight 7, and covers the inspection opening 7C in an openable manner from the rear side. The battery cover 8 is moved vertically in parallel along the rear surface 7A of the counterweight 7 between the open position shown in FIGS. 5 and 6 and the closed position shown in FIG. 2 by the link mechanism 9.

[0020] When the battery cover 8 moves to the open position, the inspection opening 7C is opened and the battery 16 etc. are exposed to the outside. When the battery cover 8 moves to the closed position, the inspection opening 7C is closed and the battery 16 etc. are covered from the rear. A lock mechanism 8A is provided on the lower end side of the battery cover 8. The lock mechanism 8A locks the battery cover 8 in the closed position by engaging with a stopper (not shown) provided at the lower edge of the inspection opening 7C when the battery cover 8 is in the closed position.

[0021] The link mechanism 9 is provided between the counterweight 7 and the battery cover 8. The link mechanism 9 is provided between the mounting base 10 fixed to the inner peripheral edge on the left side of the inspection opening 7C and the battery cover 8, and between the mounting base 10 fixed to the inner peripheral edge on the right side of the inspection opening 7C and the battery cover 8, respectively. The link mechanism 9 supports the battery cover 8 so as to be vertically translatable between the open position shown in FIG. 5 and the closed position shown in FIG. 2. The link mechanism 9 is composed of a first link member 11, a second link member 12, a spring member 13, etc.

[0022] One end of the first link member 11 is rotatably pin-connected to the mounting base 10, and the other end of the first link member 11 is rotatably pin-connected to a bracket (not shown) provided on the inner surface of the battery cover 8. The second link member 12 is arranged on the opposite side in the left-right direction to the first link member 11 with the mounting base 10 interposed therebetween. One end of the second link member 12 is rotatably pin-connected to the mounting base 10, and the other end of the second link member 12 is rotatably pin-connected to the said bracket provided on the inner surface of the battery cover 8.

[0023] The spring member 13 is provided between the mounting base 10 and the first link member 11. The spring member 13 is formed by a tension spring. One end of the spring member 13 is rotatably pin-connected to the mounting base 10, and the other end of the spring member 13 is rotatably pin-connected to the first link member 11. The spring member 13 expands and contracts while rotating about the pin-connection portion with the mounting base 10 as the first link member 11 rotates about the pin-connection portion with the mounting base 10. Thereby, the battery cover 8 is biased toward the open position from the closed position, assisting the force required for the operator to lift the battery cover 8 from the closed position to the open position.

[0024] The electric motor 14 serving as the power source of the electric hydraulic excavator 1 is located on the front side of the counterweight 7 and mounted on the slewing frame 5. The electric motor 14 operates by the electric power supplied from an external power source (not shown) or the battery 16, and drives the hydraulic pump 15. The hydraulic pump 15 supplies hydraulic oil for operation to hydraulic actuators such as the cylinders 4E, 4F, 4G of the working device 4, the travel motors of the lower travel body 2, and the slewing motor of the slewing device (none of which are shown).

[0025] The battery 16 is located on the front side of the counterweight 7 and mounted on the rear side of the slewing frame 5. The battery 16 includes a plurality of battery modules (not shown) electrically connected to each other and a housing 16A in which these plurality of battery modules are housed, and supplies electric power to the electric motor 14. As shown in FIGS. 4 and 6, the battery 16 is disposed at a position facing the battery cover 8, and by setting the battery cover 8 to the open position, inspection work on the battery 16 is performed through the inspection opening 7C of the counterweight 7.

[0026] The service plug 17 is disposed on the rear surface 16B of the housing 16A of the battery 16, which is on the side of the inspection opening 7C of the counterweight 7, and is covered from the rear by the battery cover 8. The service plug 17 is detachably provided on the battery 16 in order to cut off the electric circuit including the battery 16. The inspection work on the battery 16 is performed with the service plug 17 removed from the battery 16. Here, as shown in FIG. 4, the service plug 17 is disposed at a position close to the upper surface 16C of the rear surface 16B of the housing 16A. That is, the service plug 17 is disposed at a position covered by the battery cover 8 in a state where the movement of the battery cover 8 from the closed position to the open position is restricted by the power supply cable 25 described later.

[0027] The charger 18 is attached to the upper surface 16C of the housing 16A that constitutes the battery 16. The charger 18 is electrically connected to the battery 16. The charger 18 is connected to an external power source (not shown) via a power supply port 23 and a power supply cable 25 described later. The charger 18 supplies the power supplied from the external power source to the electric motor 14 via an inverter or the like (not shown), and charges the surplus power into the battery 16. As shown in FIG. 7, one end of a cable 19 is connected to the charger 18, and the other end of the cable 19 is connected to the power supply port 23.

[0028] The exterior cover 20 is located on the front side of the counterweight 7 and is provided on the swivel frame 5. The exterior cover 20 covers the electric motor 14, the hydraulic pump 15, the battery 16, etc. together with the counterweight 7. The exterior cover 20 includes a left exterior cover 20A that covers the battery 16 etc. from the left side, and a right exterior cover 20B that covers the electric motor 14, the hydraulic pump 15, the battery 16, etc. from the right side and the upper side.

[0029] On the left end side of the counterweight 7, a rectangular parallelepiped casing 21 that protrudes upward from the overhanging portion 7B is provided. A cable insertion hole (not shown) that penetrates the overhanging portion 7B of the counterweight 7 in the vertical direction is provided below the casing 21, and the other end of the cable 19 is led into the casing 21 through the cable insertion hole. A circuit breaker 22 is provided inside the casing 21, and an intermediate portion of the cable 19 is connected to the circuit breaker 22 inside the casing 21. The circuit breaker 22 has an operation lever 22A disposed outside the casing 21, and shuts off the power supplied from the external power source to the charger 18 via the cable 19 in response to the operation of the operation lever 22A.

[0030] The power supply port 23 is provided on the left end side of the protruding portion 7B of the counterweight 7 via the casing 21. The power supply port 23 is connected to the other end of a cable 19 with one end connected to the charger 18, and is provided on the upper side of the counterweight 7 (outside the upper swing body 3) via the casing 21. The power supply port 23 is attached to the tip of a stepped cylindrical vehicle-side coupler 24 fixed to the upper end side of the casing 21. A power supply-side coupler 26 provided at the tip of a power supply cable 25 extending from an external power source is detachably attached to the vehicle-side coupler 24. Thereby, the power supply cable 25 is electrically connected to the power supply port 23, and electric power from the external power source is supplied to the electric motor 14 and the battery 16 via the power supply cable 25, the power supply port 23, the cable 19, the charger 18, etc.

[0031] Here, the vehicle-side coupler 24 is inclined obliquely downward from the upper end side of the casing 21 toward the protruding portion 7B of the counterweight 7, and the power supply port 23 attached to the tip of the vehicle-side coupler 24 is also arranged downward. Further, a lid 24A is rotatably attached to the vehicle-side coupler 24 about a pin 24B, and in a state where the power supply-side coupler 26 is removed from the vehicle-side coupler 24, the power supply port 23 is closed by the lid 24A.

[0032] The cable support device 27 is provided on the protruding portion 7B of the counterweight 7 and supports an intermediate portion of the power supply cable 25 connected to the power supply port 23. The cable support device 27 includes a stand 27A extending upward from the protruding portion 7B of the counterweight 7, an arm 27B, and a cable clamp 27C as a clamping portion. The base end of the arm 27B is attached to the stand 27A, and the tip side of the arm 27B protrudes rearward from the stand 27A. The cable clamp 27C is attached to the tip of the arm 27B and grips an intermediate portion of the power supply cable 25 connected to the power supply port 23.

[0033] As shown in FIG. 4, the height dimension from the upper surface 7D of the counterweight 7 to the cable clamp 27C is set to be larger than the height dimension from the upper surface 7D of the counterweight 7 to the power supply port 23. The power supply port 23 is located between the upper surface 7D of the counterweight 7 and the cable clamp 27C in the vertical direction and is arranged downward. Thereby, a slack portion 25A that is slack in the vertical direction is formed between the tip connected to the power supply port 23 and the portion gripped by the cable clamp 27C of the power supply cable 25. The lower end 25B of the slack portion 25A is arranged at a position lower than the upper surface 7D of the counterweight 7.

[0034] As shown in FIGS. 3 and 4, when the battery cover 8 attempts to move from the closed position to the open position with the power supply cable 25 connected to the power supply port 23, the slack portion 25A of the power supply cable 25 is arranged above the battery cover 8. Therefore, when the slack portion 25A of the power supply cable 25 abuts against the upper edge of the battery cover 8, the movement of the battery cover 8 to the open position is restricted, and a configuration is provided that can prevent the battery cover 8 from opening further. That is, the power supply port 23 is arranged at a position that restricts the movement of the battery cover 8 from the closed position to the open position by the connected power supply cable 25 when the power supply cable 25 is connected. Thereby, during the charging operation of supplying (charging) power from an external power source to the battery 16 via the charger 18, the battery cover 8 is prohibited from inadvertently moving from the closed position to the open position, and a configuration is provided that can prevent an operator from accidentally contacting the service plug 17 or the like of the battery 16.

[0035] On the other hand, when the power supply cable 25 is connected to the power supply port 23, the electric hydraulic excavator 1 can perform excavation work and the like while rotating the upper swing body 3 by driving the electric motor 14 with the power from an external power source. Here, even if a large tension acts on the power supply cable 25 during the rotation of the upper swing body 3, this tension is suppressed by the slack portion 25A between the power supply port 23 and the cable clamp 27C, and it is possible to prevent the power supply cable 25 from detaching from the power supply port 23. Furthermore, by providing the slack portion 25A between the power supply port 23 and the cable clamp 27C, it is possible to prevent rainwater and the like from entering the power supply port 23 along the power supply cable 25.

[0036] Here, the service plug 17 of the battery 16 is disposed at a position covered by the battery cover 8 in a state where the movement of the battery cover 8 from the closed position to the open position is restricted by the power supply cable 25 (the state in FIG. 4). Thereby, even if the battery cover 8 slightly moves from the closed position toward the open position when it contacts the power supply cable 25, the battery cover 8 can prevent the operator from contacting the service plug 17. Also, by changing the position of the power supply cable 25 gripped by the cable clamp 27C, the height dimension from the upper surface 7D of the counterweight 7 to the lower end 25B of the slack portion 25A (the degree of slack of the slack portion 25A) can be adjusted. Thereby, the position restricting the movement of the battery cover 8 (the degree of opening of the battery cover 8) can be adjusted as appropriate.

[0037] On the other hand, as shown in FIG. 6, when the battery cover 8 is in the open position, the power supply port 23 is disposed lower than the upper end 8B of the battery cover 8 in the open position and within the width dimension of the battery cover 8 in the left - right direction. Therefore, the power supply port 23 is covered from behind by the battery cover 8 in the open position. Thereby, when the inspection opening 7C of the counterweight 7 is opened and the service plug 17 of the battery 16 is exposed to the outside, the operation of connecting the power supply cable 25 to the power supply port 23 is blocked by the battery cover 8.

[0038] The hydraulic excavator 1 according to this embodiment has the configuration as described above. Hereinafter, the operation of the hydraulic excavator 1 will be described.

[0039] When there is an external power source at the work site, the power supply cable 25 extending from the external power source is connected to the power supply port 23 arranged on the upper side of the counterweight 7 of the hydraulic excavator 1. Thereby, the power from the external power source is supplied to the electric motor 14 via the charger 18, an inverter, etc. (not shown), and the electric motor 14 drives the hydraulic pump 15 with the power from the external power source. On the other hand, when operating the electric motor 14 with the power from the battery 16, the power supply cable 25 is removed from the power supply port 23. Thereby, the electric motor 14 drives the hydraulic pump 15 with the power from the battery 16.

[0040] In this way, the electric motor 14 drives the hydraulic pump 15 with the power supplied from the external power source or the battery 16, and the hydraulic pump 15 supplies hydraulic oil for operation to hydraulic actuators such as each cylinder 4E, 4F, 4G of the working device 4, the traveling motor of the lower traveling body 2, and the slewing motor of the slewing device (none of which are shown). In this state, when the operator operates the traveling lever pedal (not shown), the hydraulic excavator 1 is traveled to the work site. After the hydraulic excavator 1 has moved to the work site, by the operator operating the working operation lever (not shown), while slewing the upper slewing body 3, excavation work such as earth and sand can be performed by the working device 4.

[0041] Next, the charging operation of supplying (charging) the power from the external power source to the battery 16 via the charger 18 will be described.

[0042] When performing a charging operation on the battery 16, as shown in FIG. 2, with the battery cover 8 held in the closed position, the power supply side coupler 26 provided at the tip side of the power supply cable 25 extending from an external power source is attached to the vehicle body side coupler 24 fixed to the casing 21. Thereby, the power supply cable 25 is electrically connected to the power supply port 23, and the electric power from the external power source is supplied (charged) to the battery 16 via the power supply cable 25, the power supply port 23, the cable 19, the charger 18, and the like.

[0043] During the charging operation of the battery 16, the battery cover 8 is held in the closed position by the locking mechanism 8A. However, during the charging operation, if the operator accidentally releases the locking mechanism 8A, the battery cover 8 may move from the closed position to the open position, and the inspection opening 7C of the counterweight 7 may be inadvertently opened.

[0044] On the other hand, in the present embodiment, the power supply port 23 is provided above the counterweight 7 via the casing 21, and in a state where the power supply cable 25 is connected to the power supply port 23, it is arranged at a position that restricts the movement of the battery cover 8 from the closed position to the open position by the connected power supply cable 25. That is, the tip of the power supply cable 25 is connected to the power supply port 23, and an intermediate portion of the power supply cable 25 is gripped by the cable clamp 27C of the cable support device 27, so that a slack portion 25A of the power supply cable 25 is formed between the power supply port 23 and the cable clamp 27C as shown in FIGS. 3 and 4. This slack portion 25A of the power supply cable 25 abuts against the upper edge of the battery cover 8, restricting the movement of the battery cover 8 to the open position and prohibiting the battery cover 8 from opening further. As a result, it is possible to prevent the battery cover 8 from inadvertently moving from the closed position to the open position during the charging operation of the battery 16.

[0045] Also, the service plug 17 of the battery 16 is disposed at a position covered by the battery cover 8 in a state where the movement of the battery cover 8 from the closed position to the open position is restricted by the power supply cable 25 (the state shown in FIG. 4). Therefore, even if the battery cover 8 slightly moves from the closed position toward the open position when it contacts the power supply cable 25, the battery cover 8 can surely prevent an operator from accidentally touching the service plug 17.

[0046] In this case, by changing the position of the power supply cable 25 gripped by the cable clamp 27C, the height dimension from the upper surface 7D of the counterweight 7 to the lower end 25B of the slack portion 25A (the degree of slack of the slack portion 25A) can be adjusted. Thereby, when the battery 16 is charged, the position (the degree of opening of the battery cover 8) that restricts the movement of the battery cover 8 by the slack portion 25A of the power supply cable 25 can be appropriately adjusted.

[0047] On the other hand, in a state where the charging of the battery 16 is completed and the power supply cable 25 is removed from the power supply port 23, as shown in FIGS. 5 and 6, the battery cover 8 can be moved from the closed position to the open position. Thereby, the inspection opening 7C of the counterweight 7 is opened, and the service plug 17 provided on the rear surface 16B of the battery 16 (the housing 16A) is exposed to the outside. Therefore, an inspection operation for the battery 16 can be performed by removing the service plug 17 through the inspection opening 7C.

[0048] In a state where the battery cover 8 is in the open position, the power supply port 23 is disposed lower than the upper end 8B of the battery cover 8 in the open position and within the lateral width dimension of the battery cover 8. Therefore, the power supply port 23 is covered from behind by the battery cover 8 in the open position (see FIG. 6). Accordingly, when the inspection opening 7C of the counterweight 7 is opened and the service plug 17 of the battery 16 is exposed to the outside, the operation of connecting the power supply cable 25 to the power supply port 23 is blocked by the battery cover 8. As a result, it is possible to surely prevent the power supply cable 25 from being inadvertently connected to the power supply port 23 while the battery cover 8 is in the open position.

[0049] Thus, in the embodiment, the upper swing body 3 includes a counterweight 7, a battery 16 disposed on the front side of the counterweight 7 and supplying power to an electric motor 14 serving as a power source, and a power supply port 23 provided outside the upper swing body 3 for supplying power from an external power source to the battery 16 and to which a power supply cable 25 extending from the external power source is connected. In the electric hydraulic shovel 1, the counterweight 7 is provided with an inspection opening 7C for inspecting the battery 16 and a battery cover 8 movable between an open position where the inspection opening 7C is opened to expose the battery 16 to the outside and a closed position where the inspection opening 7C is closed to cover the battery 16. The power supply port 23 is disposed at a position where the movement of the battery cover 8 from the closed position to the open position is restricted by the connected power supply cable 25 in a state where the counterweight 7 is connected to the power supply cable 25.

[0050] According to this configuration, by connecting the power supply cable 25 extending from the external power source to the power supply port 23, the operation of moving the battery cover 8 from the closed position to the open position can be prohibited by the power supply cable 25. Thereby, during the charging operation of the battery 16, it is possible to suppress the movement of the battery cover 8 to the open position and prevent an operator from inadvertently contacting the battery 16 through the inspection opening 7C of the counterweight 7.

[0051] In the embodiment, the counterweight 7 is provided with a cable clamp 27C of a cable support device 27 that grips a power supply cable 25 connected to the power supply port 23. The power supply port 23 is provided downward and is located between the upper surface 7D of the counterweight 7 and the cable clamp 27C in the vertical direction. When the power supply cable 25 is connected to the power supply port 23, the power supply cable 25 located between the power supply port 23 and the cable clamp 27C restricts the movement of the battery cover 8 from the closed position to the open position. According to this configuration, even if the power supply cable 25 sags between the external power supply and the cable clamp 27C, the portion of the power supply cable 25 located between the power supply port 23 and the cable clamp 27C maintains a certain posture regardless of this sag. As a result, the power supply cable 25 can stably restrict the movement of the battery cover 8 from the closed position to the open position.

[0052] In the embodiment, when the power supply cable 25 is connected to the power supply port 23, a slack portion 25A that sags vertically between the power supply port 23 and the cable clamp 27C is formed in the power supply cable 25. The slack portion 25A abuts against the battery cover 8 when the battery cover 8 moves from the closed position to the open position, thereby restricting the movement of the battery cover 8 from the closed position to the open position. According to this configuration, by changing the position of the power supply cable 25 gripped by the cable clamp 27C, the degree of slack of the slack portion 25A can be adjusted. As a result, the position at which the power supply cable 25 restricts the movement of the battery cover 8 can be adjusted as appropriate.

[0053] In the embodiment, the battery 16 is provided with a service plug 17 for interrupting an electric circuit including the battery 16. The service plug 17 is disposed on the side of the inspection opening 7C of the counterweight 7. According to this configuration, by moving the battery cover 8 to the open position, the service plug 17 can be quickly removed through the inspection opening 7C, and the inspection work of the battery 16 can be performed.

[0054] In the embodiment, the service plug 17 is disposed at a position covered by the battery cover 8 in a state where the battery cover 8 abuts against the power supply cable 25 and its movement is restricted. According to this configuration, when the movement of the battery cover 8 is restricted by the power supply cable 25, even if the battery cover 8 has moved slightly from the closed position toward the open position side, the service plug 17 is covered by the battery cover 8, thereby preventing an operator from accidentally contacting the service plug 17.

[0055] In the embodiment, the power supply port 23 is covered by the battery cover 8 in a state where the battery cover 8 is in the open position. According to this configuration, when the inspection opening 7C of the counterweight 7 is opened and the service plug 17 of the battery 16 is exposed to the outside, the operation of connecting the power supply cable 25 to the power supply port 23 can be blocked by the battery cover 8.

[0056] In the embodiment, the power supply port 23 is disposed lower than the upper end 8B of the battery cover 8 in the open position and within the lateral width dimension of the battery cover 8 in a state where the battery cover 8 is in the open position. According to this configuration, the power supply port 23 can be reliably covered by the battery cover 8 holding the open position.

[0057] Note that, in the embodiment, the case where the battery cover 8 moves vertically in parallel between the closed position and the open position by the link mechanism 9 is illustrated. However, the present invention is not limited to this, and for example, a configuration may be adopted in which the upper end side is attached to the counterweight via a hinge mechanism and the lower end side of the battery cover is rotatable in the vertical direction. Further, a configuration may be adopted in which one end side in the lateral direction is attached to the counterweight via a hinge mechanism and the other end side in the lateral direction of the battery cover is rotatable in the lateral direction.

[0058] In the embodiment, the electric hydraulic excavator 1 including a vehicle body composed of the lower traveling body 2 and the upper slewing body 3 is illustrated. However, the present invention is not limited to this, and for example, it can also be applied to electric construction machines without an upper slewing body such as electric wheel loaders.

Description of Symbols

[0059] 2 Lower Traveling Body (Vehicle Body) 3 Upper Slewing Body (Vehicle Body) 4 Working Device 7 Counterweight 7C Inspection Opening 8 Battery Cover 14 Electric Motor 16 Battery 17 Service Plug 23 Power Supply Port 25 Power Supply Cable 25A Slack Portion 27 Cable Support Device 27C Cable Clamp (Clamping Portion)

Claims

1. A battery disposed inside the vehicle body and supplying power to an electric motor serving as a power source, and a power supply port to which a power supply cable extending from an external power source is connected to supply power to the battery, in an electric construction machine. An inspection opening for exposing the inside of the vehicle body where the battery is disposed to the outside to inspect the battery, and a cover movable between an open position for opening the inspection opening and a closed position for closing the inspection opening are provided. The electric construction machine is characterized in that the cover prevents connection of the power supply cable to the power supply port in a state where the cover is located at the open position.

2. The electric construction machine according to claim 1, wherein the cover permits connection of the power supply cable to the power supply port in a state where the cover is located at the closed position.

3. There are at least one or more of the power supply ports. The electric construction machine according to claim 1, wherein the cover prevents connection of the power supply cable to all of the power supply ports in a state where the cover is located at the open position.

4. The power supply port is disposed at a position that restricts movement of the cover from the closed position to the open position by the connected power supply cable in a state where the power supply cable is connected to the power supply port. The electric construction machine according to claim 1.

5. The battery is provided with a service plug for interrupting an electric circuit including the battery. The electric construction machine according to claim 1, wherein the service plug is disposed on the inspection opening side.

6. The electric construction machine according to claim 1, wherein the electric motor is driven by power from the external power source in a state where the power supply cable is connected to the power supply port.

7. The electric construction machine according to claim 1, wherein the power supply port is covered by the cover in a state where the cover is located at the open position.

8. The electric construction machine according to claim 7, wherein the power supply port is lower than the upper end of the cover at the open position and is disposed within the lateral width dimension of the cover in a state where the cover is located at the open position.

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