JP2019190098A - Electric driven hydraulic shovel - Google Patents

Abstract

To utilize a merit of suppressing a rear end turning radius that a cable holding member does not protrude behind a rear end of a revolving structure even if the rear end turning radius is suppressed.SOLUTION: In an electric driven hydraulic shovel, a cable holding member 55 is configured such that a first opening of a cable insertion path formed in an upwardly convex arcuate shape is opened on a rear end side of a revolving structure with respect to a shaft 53, and a second opening is opened on the opposite side of the first opening across the shaft 53. A cable extending from an external power source is configured to be passed through the cable insertion path from the rear end side of the revolving structure through the first opening, taken out from the second opening to the front side of the shaft, and connected to a control panel.SELECTED DRAWING: Figure 5

Description

  The present invention relates to an electrically driven hydraulic excavator that drives a hydraulic pump with an electric motor, and in particular, even if the rear end turning radius is suppressed, the cable holding member does not protrude behind the rear end of the revolving structure, and the rear end turning radius is increased. The present invention relates to an electrically driven hydraulic excavator that does not impair the merit to suppress.

  When excavation work is performed in tunnel tunnels, indoors, vertical shafts, underground sites, etc., instead of engine-driven hydraulic excavators that emit exhaust gas, an electric motor that drives a hydraulic pump that discharges pressure oil that drives an actuator Driven hydraulic excavators are sometimes used. In an electrically driven hydraulic excavator, a strut with an arm-shaped cable holding member attached to the tip is set up at the top of the revolving unit so that the power supply cable connected to an external power source is not stepped on the crawler track. It is hung so that cables do not hang around the track. In some cases, the cable holding member is configured to rotate with respect to the support column, and the cable burden such as twisting and pulling associated with the turning of the turning body is reduced (see Patent Document 1).

JP 2017-43980 A

  In a hydraulic excavator provided with a revolving structure that revolves with respect to the traveling body, a support that supports the cable holding member may be disposed near the revolving center of the revolving structure so that the cable is not swung with the turning. desirable. Further, since excavation reaction force acts on the work machine as the work is performed, it is desirable that the base of the work machine is also arranged near the turning center of the swivel body in order to suppress the moment load acting on the swivel body by the work machine. However, if the support for supporting the cable holding member and the base of the work implement are arranged near the center of rotation, the boom of the work implement may interfere with the support when the work implement is tilted backwards by raising the boom to the full limit. is there. Therefore, also in patent document 1, the support | pillar is made to incline back with respect to a root part so that it may not interfere with a working machine.

  The hydraulic excavator in this document is a standard type hydraulic excavator, and there is a margin in the distance from the turning center to the rear end of the revolving structure (hereinafter referred to as the rear end turning radius). The holding member does not protrude rearward from the rear end of the revolving unit. However, since the rear end turning radius is set to be shorter in relatively small models, the cable holding member can protrude rearward from the rear end of the revolving structure when the support column is tilted backward to avoid interference with the work equipment. There is sex. When the cable holding member protrudes from the rear end of the swivel body, the cable holding member easily interferes with surrounding obstacles when turning the swivel body, and the merit of a relatively small model that can turn in a narrow place is lost. End up.

  An object of the present invention is to provide an electric drive hydraulic excavator in which the cable holding member does not protrude rearward from the rear end of the revolving structure even if the rear end turning radius is suppressed, and the merit of suppressing the rear end turning radius is not impaired. It is in.

  To achieve the above object, a traveling body, a revolving body provided on the upper part of the traveling body, a working machine attached to the revolving body, a hydraulic actuator that drives the working machine, and a pressure that drives the hydraulic actuator. A hydraulic pump that discharges oil; an electric motor that drives the hydraulic pump; a control panel that adjusts the power supplied to the electric motor; a cable that connects the control panel and an external power source; And a cable bracket for holding the cable, the cable bracket having an axis extending up and down on an upper portion of the support column, and a cable holding member rotatably provided around the axis In the hydraulic excavator, the cable holding member includes a first opening that opens on a rear end side of the revolving unit with respect to the shaft, and the first opening across the shaft. And a second opening that opens on the opposite side of the opening, and has a cable insertion passage formed in an upwardly convex arcuate shape, and the cable extending from the external power source is disposed behind the swivel body It is configured to be passed through the cable insertion path from the end side through the first opening, and to be taken out from the second opening to the front side of the shaft and connected to the control panel. To do.

  In the cable holding member according to the present invention, the first opening of the cable insertion passage opens on the rear end side of the rotating body with respect to the shaft, and the second opening opens on the opposite side of the first opening across the shaft. It is formed to do. Therefore, after securing the size of the cable holding member according to the allowable bending radius of the cable, the first opening of the cable insertion passage located on the rear end side of the revolving structure is disposed forward compared to the conventional case. Therefore, even if a relatively small hydraulic excavator with a reduced rear end turning radius is applied, the cable holding member can be prevented from protruding backward from the rear end of the rotating body. Accordingly, the advantage of the relatively small model that the interference with the obstacles around the rear of the rear end of the swing body can be suppressed when the swing body is turned by suppressing the rear end turning radius can be utilized.

The left view showing the whole composition of the electric drive excavator concerning one embodiment of the present invention. The right view showing the whole composition of the electric drive type hydraulic excavator concerning one embodiment of the present invention. The top view showing the whole composition of the electric drive type hydraulic excavator concerning one embodiment of the present invention. The rear view showing the whole composition of the electric drive type hydraulic excavator concerning one embodiment of the present invention. The right side view of the support | pillar and cable bracket with which the electrically driven hydraulic excavator shown in FIG. 1 was equipped. Rear view of the column and cable bracket provided in the electrically driven hydraulic excavator shown in FIG. Cross-sectional view taken along line VII-VII in FIG.

  Embodiments of the present invention will be described below with reference to the drawings.

-Electric drive excavator-
1 is a left side view showing the overall configuration of an electrically driven hydraulic excavator according to an embodiment of the present invention, FIG. 2 is a right side view, FIG. 3 is a plan view, and FIG. 4 is a rear view. In FIG. 2, a movable range of a work machine 40 and an opening / closing lid 38 to be described later are shown together. In FIG. 3, a post 51 and a cable 50 described later are omitted. In the following description, the left direction in FIG.

  The electrically driven hydraulic excavator (hereinafter, hydraulic excavator) shown in FIGS. 1 to 4 includes an electric motor (electric motor) instead of an engine (internal combustion engine) as a prime mover for driving a hydraulic pump, and an external power source ( This is a work machine that drives an electric motor with electric power supplied from an unillustrated). The hydraulic excavator includes a vehicle body 10 and a work machine (front work machine) 40 attached to the vehicle body 10. The vehicle body 10 includes a traveling body 20 and a revolving body 30.

-Traveling body The traveling body 20 may be a wheel-type traveling body, but is a crawler-type traveling body in the present embodiment, and includes a track frame 21, a driven wheel (idler) 22, a driving wheel 23, a crawler (crawler belt) 24, and a traveling drive. A device 25 is provided.

  Although not shown, the track frame 21 is formed in an H shape when viewed from above, and supports a driven wheel 22 at the front of the left and right sides and a driving wheel 23 at the rear of the left and right sides. The output shaft of the travel drive device 25 is connected to the shafts of the left and right drive wheels 23, respectively. The travel drive device 25 includes a hydraulic motor and a speed reducer. The crawler 24 is hung around the driven wheel 22 and the drive wheel 23 on both the left and right sides. When the driving wheel 23 is driven by the travel driving device 25, the crawler 24 is circulated between the driven wheel 22 and the driving wheel 23.

-Revolving body The revolving body 30 is provided in the upper part of the track frame 21 via the turning wheel 26 so that turning is possible, and is provided with the turning frame 31, the counterweight 33, the power chamber 34, etc.

  The revolving frame 31 is a base frame of the revolving structure 30 and is provided on the upper part of the track frame 21 via the revolving wheel 26, and the revolving structure 30 can revolve with respect to the traveling body 20 around the revolving center C. is there. A turning motor (not shown) is mounted on the turning frame 31 in the vicinity of the turning wheel 26, and an output shaft of the turning motor meshes with a gear provided on the turning wheel 26, so 30 turns. Although an electric motor can be used as the swing motor, a hydraulic motor is used in this embodiment.

  The hydraulic excavator according to the present embodiment is a remote-operated drone using a wireless or wired remote controller, and a driver's cab is omitted. However, a cab may be provided, and in that case, the cab can be arranged at a position offset to one side in the left-right direction (left side in the present embodiment) with respect to the turning center C. The counter weight 33 is a weight for balancing the weight with the work machine 40, and is provided at the rear end of the turning frame 31.

  The power chamber 34 is located between the work machine 40 and the counterweight 33. The power chamber 34 includes a motor 35 (FIG. 1), a hydraulic pump 36, a heat exchanger such as an oil cooler (not shown), and a valve that controls the flow of pressure oil supplied from the hydraulic pump 36 to the hydraulic actuator. Units etc. are accommodated. The electric motor 35 is a prime mover, and the hydraulic pump 36 is driven by the electric motor 35. For example, the hydraulic oil in a hydraulic oil tank 37 (FIG. 3) disposed on the right side of the working machine 40 in the revolving structure 30 is sucked and discharged as pressure oil. The hydraulic pump 36 is located on the right side of the electric motor 35. The hydraulic oil tank 37 is located, for example, on the right side of the working machine 40 in the revolving structure 30 and in front of the power chamber 34 (hydraulic pump 36). An engine (internal combustion engine) is not mounted on a hydraulic excavator.

  A portion extending from the upper surface to the rear surface of the outer wall of the revolving body 30 constitutes an opening / closing lid 38 that covers the power chamber 34. The front end of the opening / closing lid 38 is connected to the outer wall of the upper surface of the revolving body 30 via a hinge, and the rear part rotates up and down with the front end as a fulcrum to open and close the power chamber 34. (FIG. 2). The hydraulic excavator of this example is a relatively small model, and is configured such that an operator standing on the ground during maintenance or the like can easily access the electric motor 35 and the like in the power chamber 34 from the rear of the revolving body 30. In a relatively large model of medium size or larger, the revolving unit is located at a high position from the ground, so that an operator usually stands on the revolving unit and accesses the inside of the power chamber. Therefore, in a relatively large model, the front and rear doors of the power chamber are generally opened and closed with the rear end as a fulcrum so that an operator standing on the swing body can easily access from the front.

  For example, a control panel (not shown) is disposed on the revolving body 30 at a position on one side of the work machine 40 in the left-right direction. In the case of an engine-driven hydraulic excavator, a fuel tank may be disposed in front of the hydraulic oil tank 37. However, in the hydraulic excavator of this example, the fuel tank is omitted. Can be installed. Further, as described above, since the cab is also omitted in the present embodiment, the control panel can be installed in the space on the left side of the work machine 40. This control panel is a device that receives power from an external power supply (not shown). Although not specifically shown, the control panel electrically cuts off and turns on the external power supply as necessary, and electrically adjusts the frequency of the input power. It is equipped with an inverter device that can output. Electric power adjusted by an inverter at a frequency corresponding to the rotational speed of the electric motor 35 is supplied to the electric motor 35 through the control panel. A cable bracket 52 (described later) for supporting a power supply cable 50 by contact with the traveling body 20 is attached to the upper part of the revolving body 30.

-Work machine The work machine 40 is an articulated front work machine including a work arm 41 and a breaker 44 as a work tool. The work arm 41 includes a boom 42, an arm 43, a boom cylinder 45, an arm cylinder 46, and a work tool cylinder 47. The boom 42 is connected to the front portion of the revolving body 30 so as to be rotatable in the vertical direction. The arm 43 is connected to the tip of the boom 42 and the breaker 44 is connected to the tip of the arm 43 so as to be rotatable. The boom cylinder 45 is connected to the swing body 30 and the boom 42, and the arm cylinder 46 is connected to the boom 42 and the arm 43 at both ends. The work tool cylinder 47 has a base end connected to the arm 43 and a tip connected to the tip of the arm 43 and the breaker 44 via a link 48. The boom cylinder 45, the arm cylinder 46, and the work tool cylinder 47 are all hydraulic actuators, are driven by the pressure oil discharged from the hydraulic pump 36, and drive the work implement 40 by an expansion / contraction operation. Other work tools such as a bucket, a magnet, and a clamshell bucket can be attached to the work arm 41 instead of the breaker 44.

−External power source−
An external power source (not shown) is, for example, a generator, and is installed at an appropriate place separately from the hydraulic excavator. The external power source and the hydraulic excavator are connected via a cable 50. Specifically, one end of the cable 50 is connected to the output unit of the external power supply, and the other end is connected to the above-described control panel of the hydraulic excavator. The length of the cable 50 is set so as not to hinder the operation of the hydraulic excavator.

-Cable holding mechanism-
FIG. 5 is a right side view of a column and a cable bracket provided in the hydraulic excavator of this example, FIG. 6 is a rear view, and FIG. 7 is a cross-sectional view taken along line VII-VII in FIG. The cable bracket 52 holds the cable 50 and is supported by a support column 51 erected on the upper part of the revolving unit 30. The support 51 and the cable bracket 52 constitute a cable holding mechanism. First, the support column 51 will be described.

・ Prop 51
The support column 51 is attached to a bracket portion 31 a (FIG. 5) provided on the revolving frame 31 in order to connect the foot portion of the boom 42 of the work implement 40 in this example. The bracket portion 31a is disposed so as to overlap the turning center C, and the base portion of the support column 51 is located in the vicinity of the turning center C (in this example, behind the turning center C). Here, when the boom cylinder 45 is fully extended and the boom is raised to the full limit, the base side portion of the boom 42 bent in the boomerang shape has a vertical turning center as shown by a two-dot chain line in FIG. Tilt backwards beyond C. Hereinafter, the position of the boom 42 indicated by a two-dot chain line in FIG. 2 is referred to as an upper limit position. When the open / close lid 38 is closed, the upper surface is horizontal, but when the lid 38 is opened, the rear part rises with the front edge as a fulcrum, and as shown in FIG. Become. Between the open / close lid 38 in such an open state and the work machine 40 (boom 42) at the upper limit position, a long and narrow gap is formed that is inclined rearwardly upward when viewed from the left and right as shown in FIG. The support column 51 is laid back so as not to interfere with the movable region of the work machine 40 and the opening / closing lid 38 by being tilted backward so as to pass through the slanted slant gap. Next, the cable bracket 52 will be described.

・ Cable bracket 52
The cable bracket 52 includes a shaft 53, an outer cylinder 54, a cable holding member 55, a stopper 56, and a buffer member 57.

  The shaft 53 is a member formed in a columnar shape, and is erected on the upper portion (upper end surface) of the support column 51 and extends in the vertical direction. The shaft 53 is fixed to the support column 51 by welding, for example. A plate 58 is attached to the upper end surface of the shaft 53 by a plurality of (three in this embodiment) bolts 59. The plate 58 functions as a retainer for the outer cylinder 54 that covers the shaft 53. A part of the plate 58 projects rearward from the outer peripheral surface of the outer cylinder 54. For example, the bolts 59 are preferably arranged so as to form the vertices of regular polygons (regular triangles in this example) centered on the center line of the shaft 53 so that the mounting angle of the plate 58 with respect to the shaft 53 can be changed.

  The outer cylinder 54 is put on the shaft 53 (the shaft 53 is passed through the inside) and covers the outer periphery of the shaft 53. The outer cylinder 54 is rotatably attached to the shaft 53 by bearings 61 (FIG. 7) at two locations, upper and lower. In the present embodiment, a configuration in which the outer cylinder 54 rotates with respect to the shaft 53 is adopted, but a configuration in which the shaft 53 rotates with the outer cylinder 54 may be employed. Although not shown in FIG. 7, a striker 62 (FIG. 5) composed of a semicircular block is fixed to the upper portion of the outer peripheral surface of the outer cylinder 54 by welding or the like. The striker 62 covers, for example, about a half circumference of the outer peripheral surface of the outer cylinder 54. When the outer cylinder 54 rotates counterclockwise as viewed from above, the end surface facing the rotation direction (counterclockwise direction) of the outer cylinder 54 comes into surface contact with the stopper 56, and when it rotates clockwise, the rotation direction of the outer cylinder 54 (clockwise rotation). The end surface facing (direction) is configured to come into surface contact with the stopper 56.

  The cable holding member 55 is a member that directly supports and holds the cable 50, and is provided so as to be rotatable about the shaft 53. Specifically, the cable holding member 55 includes left and right side plates 63, guide plates 64, and a plurality (three in this example) of holders 65.

  The left and right side plates 63 are members that restrain the left and right sides of the cable 50, and when viewed from the left and right, the upper edge portion is formed of an arcuate fan-shaped (or semi-circular) plate material that protrudes upward (FIG. 5). . However, when viewed from the front and back, the lower portions of the left and right side plates 63 are bent outward in the left-right direction to form a horizontal plane (FIG. 6). The guide plate 64 is interposed between the left and right side plates 63 and fixed to the opposing surfaces of the left and right side plates 63 by welding or the like, and connects the left and right side plates 63. The guide plate 64 is formed in a bow shape that is convex upward by curving a flat plate. The radius of the arc formed by the guide plate 64 when viewed from the left and right is smaller than the radius of the arc formed by the upper edge of the side plate 63, and the upper edge of the side plate 63 and the guide plate 64 are concentric. (FIG. 5). The radius of curvature of the guide plate 64 is set larger than the allowable bending radius of the cable 50. The holder 65 is a C-shaped member, and is fixed to the guide plate 64 with bolts 66 in a posture in which the C-shaped opening faces the outer peripheral surface of the guide plate 64 (FIG. 6). Each holder 65 is attached in such a posture that a space formed between it and the guide plate 64 is opened in the circumferential direction of the arc-shaped outer peripheral surface of the guide plate 64.

  The cable holding member 55 configured as described above is disposed on the upper part of the striker 62 with the spacer 67 interposed therebetween, and the horizontal surface at the lower part of the side plate 63 is fastened to the upper end surface of the striker 62 with a plurality of bolts 68 via the spacer 67. . Thus, the cable holding member 55 is fixed to the outer cylinder 54 via the striker 62. 1, 2, and 3 to 6, the center of the outer peripheral surface (arc) of the striker 62 is located forward when viewed from above (a surface extending in the front-rear direction including the center line of the shaft 53). The striker 62 is equally divided into left and right), and the outer cylinder 54 is stopped. In this state, the cable holding member 55 is configured to extend in the front-rear direction (the holder 65 is aligned in the front-rear direction). That is, the rotating body that includes the outer cylinder 54, the striker 62, and the cable holding member 55 and rotates integrally is formed so as to have a bilaterally symmetric shape in the state of each drawing. At this time, the three holders 65 are arranged along the outer peripheral surface of the guide plate 64 at a predetermined interval. In this example, the center holder 65 is vertically attached to the top of the guide plate 64 as viewed from the left and right ( FIG. 5). In the present embodiment, the top portion of the guide plate 64 and the central holder 65 are located on an extension of the center line of the shaft 53. Therefore, the cable holding member 55 rotates (rotates) around the top of the guide plate 64. The holders 65 on both sides sandwiching the center holder 65 (the front holder 65 and the rear holder 65) are arranged so as to sandwich the center line of the shaft 53 (the rotation axis of the cable holding member 55) between them. .

  Here, the cable holding member 55 has an upwardly convex arcuate cable insertion path. In the present embodiment, the above-described guide plate 64 is the bottom surface of the cable insertion path, and the holder 65 also serves as a side surface and a ceiling surface of the cable insertion path. In the present embodiment, since the plurality of holders 65 are arranged at intervals, the cable insertion path is intermittent, but as a whole constitutes a wiring path for one tunnel-shaped cable. In the case of this embodiment, the opening of the holder 65 located at the rearmost position in a state where the plurality of holders 65 are arranged in the front-rear direction is the first opening of the cable insertion path, and the opening of the holder 65 located at the foremost position is the second. Is the opening. The first opening of the cable insertion passage is opened downward with respect to the shaft 53 on the rear end side of the revolving structure 30, and the other second opening is on the opposite side of the first opening across the shaft 53 (that is, work The machine 40 side) opens downward. In the present embodiment, the cable insertion path has a longitudinally symmetrical shape with respect to the center line of the shaft 53. A cable 50 extending from an external power source (not shown) is passed through the cable insertion path from the rear end side of the revolving structure 30 through the first opening, and is taken out from the second opening to the front side of the shaft 53 and described above. Connected to the control panel. In addition, while allowing the cable holding member 55 to rotate, the cable 50 is moderately placed between the cable holding member 55 and the control panel so that a tensile load does not act on the cable 50 as the cable holding member 55 rotates. The slack is secured.

  The stopper 56 is a member that limits the movable range (rotation angle) of the cable holding member 55, is attached to the rear end portion of the plate 58 by welding or the like, and is fixed to the shaft 53 via the plate 58. The stopper 56 is located on the rear side of the outer cylinder 54 and extends downward from the plate 58. Specifically, the stopper 56 is a T-shaped block body including a relatively wide upper portion 56A and a relatively narrow lower portion 56B (FIG. 6). The outer cylinder 54 rotates and the striker 62 described above interferes with the left or right side surface of the upper portion 56A of the stopper 56, so that the movable range of the cable holding member 55 is limited. As shown in FIG. 1, based on the posture in which the cable holding member 55 extends back and forth, in this embodiment, the movable range of the cable holding member 55 is set to an arbitrary set angle α left and right (for example, about 50 degrees in total by about 50 degrees). Is set to As described above, the circumferential position of the stopper 56 with respect to the shaft 53 can be adjusted by changing the mounting angle of the plate 58 with respect to the shaft 53.

  The buffer member 57 is a member that softens the collision between the stopper 56 and the rotating body (directly the striker 62 in this example) including the cable holding member 55, and is provided on both opposing surfaces of the striker 62 with the lower part 56 </ b> B of the stopper 56. It has been. The buffer member 57 is, for example, a screw provided with a hemispherical elastic member (rubber or the like) at the tip, and is screwed into the end face of the striker 62 so that the distance between the end face of the striker 62 and the elastic body can be adjusted. The protruding amount of the elastic body from the end face of the striker 62 is adjusted so as to be larger than the step size between the upper part 56A and the lower part 56B of the stopper 56. Thus, when the outer cylinder 54 rotates, the elastic body of the buffer member 57 contacts the lower portion 56B of the stopper 56 before the striker 62 contacts the upper portion 56A of the stopper 56, and the contact between the rotating body and the stopper 56 occurs. The impact of time is eased.

-Operation-
The hydraulic excavator according to the present embodiment is typically used in a scene where excavation work or the like is performed in a closed space such as in a tunnel mine, indoors, a shaft, or underground. When the hydraulic excavator is operated, first, an external power source (not shown) and the hydraulic excavator are connected by the cable 50. At this time, the cable 50 is passed through the cable insertion passage of the cable holding member 55, and the cable 50 is moderately slackened between the cable holding member 55 and the hydraulic excavator (control panel). If necessary, the circumferential position of the stopper 56 with respect to the shaft 53 is adjusted according to the positional relationship between the external power source and the hydraulic excavator by changing the mounting angle of the plate 58 with respect to the shaft 53. Thereafter, the external power source is operated to start supplying power to the hydraulic excavator, and the operator appropriately operates the hydraulic excavator using a remote controller (not shown). Accordingly, the excavator can be moved by the traveling body 20, the excavation work can be performed by the working machine 40, and the revolving body 30 can be swung.

-Effect-
(1) The conventional electrically driven hydraulic excavator prior to the filing of the present application is configured to suppress the movement of the cable between the control panel of the hydraulic excavator and the cable holding member. Specifically, one end of the cable holding member is fixed to the outer peripheral surface of the outer cylinder, and the cable holding member rotates around the one end. In this case, one end of the cable holding member and thus the opening on one side of the cable insertion path are close to the rotation center, so that the amount of displacement accompanying rotation is small. Since the cable is taken out from the cable insertion path near the center of rotation and wound around the post toward the control panel, even if the cable holding member swings, it is not between the cable holding member and the control panel. One advantage is that the cable runout is small.

  However, the cable holding member requires a cable insertion path for holding the cable with a radius of curvature larger than the allowable bending radius of the cable, and requires a certain longitudinal length according to the thickness of the cable. For this reason, in a configuration in which the cable holding member rotates around one end as in a conventional electrically driven hydraulic excavator, the cable holding member is used in a relatively small model in which the distance from the turning center to the rear end of the turning body is short. In some cases, it protrudes backward from the rear end of the revolving structure.

  On the other hand, in the cable holding member 55 of the present embodiment, the first opening of the cable insertion path is opened on the rear end side of the revolving unit 30 with respect to the shaft 53, and the second opening is first with the shaft 53 interposed therebetween. It is formed so as to open on the opposite side to the opening. The cable holding member 55 is offset forward relative to the shaft so that the cable insertion path straddles the rotation center. Therefore, after securing the size of the cable holding member 55 in accordance with the allowable bending radius of the cable 50, the first opening of the cable insertion passage located on the rear end side of the revolving structure 30 is disposed forward compared to the conventional case. can do. Therefore, even when a relatively small hydraulic excavator with a reduced rear end turning radius is applied, the cable holding member can be prevented from protruding backward from the rear end of the turning body 30. Accordingly, the advantage of the relatively small model that the interference with the obstacles around the rear of the rear end of the swing body can be suppressed when the swing body is turned by suppressing the rear end turning radius can be utilized.

  (2) Especially in this embodiment, since the cable insertion path is configured in a longitudinally symmetrical shape with respect to the shaft 53, the displacement amounts of the first opening and the second opening of the cable insertion path are equal. The cable 50 held in the cable insertion path also oscillates before and after the shaft 53, and the balance of inertial force acting on the cable 50 across the shaft 53 is offset as compared with the conventional case. The load acting on the shaft 53 can be reduced by the movement.

  However, as long as the above essential effect (1) is obtained, the cable insertion path does not have to be symmetrical in the longitudinal direction with respect to the shaft 53, and the arrangement of the shaft 53 is one of the first opening and the second opening. The structure may be biased to the side. However, when the cable insertion path is offset forward (the shaft 53 is disposed closer to the first opening), the offset amount is limited to a range in which the cable holding member 55 does not interfere with the movable range of the work implement 40. When the cable insertion path is offset rearward (the shaft 53 is disposed closer to the second opening), the offset amount is limited to a range in which the cable holding member 55 does not protrude rearward from the rear end of the revolving unit 30.

  (3) In the present embodiment, since the plurality of holders 65 are arranged at intervals, the cable insertion path is formed in an intermittent tunnel shape. Even such an intermittent cable insertion path functions as necessary and sufficient from the viewpoint of holding the cable 50. Since it is intermittent, there is also one side that allows the cable 50 to easily pass through the cable insertion passage, and there is also an advantage that the state of the cable 50 inside the cable insertion passage can be visually recognized. Assembly and removal of the holder 65 with respect to the guide plate 64 is also easy.

  However, as long as the above effect (1) is obtained, the cable insertion path does not necessarily have an intermittent configuration. For example, an arc-shaped plate straddling the upper edges of the left and right side plates 63 is provided. You may form in the shape of a continuous tunnel of books. Alternatively, the holder 65 may be omitted, and the cable insertion path may be formed in a slit shape with the upper part open on the entire surface, and the cable 50 may be simply supported by the guide plate 64.

  (4) If the cable holding member 55 is configured to rotate freely, the cable 50 may be twisted while the revolving operation of the revolving structure 30 is repeated. In the present embodiment, since the movable range of the cable holding member 55 is limited by the stopper 56, the twist of the cable 50 can be suppressed. In this embodiment, the stopper 56 interferes with the striker 62. However, if the stopper 56 interferes with a part of the rotating body including the cable holding member 55, the movable range of the rotating body is increased. Can be limited. The arrangement, shape, and size of the stopper 56 can be changed as appropriate.

  (5) Since the collision between the striker 62 and the stopper 56 is eased by providing the buffer member 57, the collision sound between the stopper 56 and the striker 62 at the time of work is eased. The shock can reduce the damage to the components of the cable bracket 52 and reduce the maintenance burden of the cable bracket 52.

  (6) Since the hydraulic excavator of the present embodiment is relatively small, the opening / closing lid 38 of the power chamber 34 opens and closes up and down, and the operator stands on the ground and enters the interior of the power chamber 34 from the rear of the swing body 30. Can be accessed. On the other hand, the opening / closing lid 38 opens toward the support column 51 of the cable bracket 52, and the region where the support column 51 is to be installed is sandwiched between the work machine 40 and the movable range of the opening / closing cover 38. Therefore, in this embodiment, the support column 51 is tilted backward to skillfully avoid the interference between the work machine 40 and the movable region of the opening / closing lid 38. Therefore, the movable range of the work machine 40 and the opening / closing lid 38 is not limited by the support column 51, and the influence on the excavation work and the maintenance operation due to the support column 51 being erected can be avoided. The present invention can also be applied to medium-sized or larger hydraulic excavators.

  (7) As described above, the mounting position and the inclined shape of the support column 51 can take advantage of the existing configuration as much as possible in consideration of the shape and arrangement of a commonly used engine cover and the swing range of the engine cover and the boom. The slanted shape was as follows. However, by changing the shape of the engine cover, it is possible to change the shape of the struts arbitrarily, and make it L-shaped within a range that does not restrict the swing range of the boom, or make it stand up like a staircase However, similar effects can be obtained.

DESCRIPTION OF SYMBOLS 20 ... Running body, 30 ... Revolving body, 34 ... Power room, 35 ... Electric motor, 36 ... Hydraulic pump, 38 ... Opening / closing lid, 40 ... Working machine, 45 ... Boom cylinder (hydraulic actuator), 46 ... Arm cylinder (hydraulic actuator) 47 ... Work tool cylinder (hydraulic actuator), 50 ... Cable, 51 ... Post, 52 ... Cable bracket, 53 ... Shaft, 55 ... Cable holding member, 56 ... Stopper, 63 ... Side plate (cable insertion path), 64 ... Guide plate (cable insertion path), 65 ... Holder (first opening, second opening, cable insertion path)

Claims (4)

A traveling body, a swiveling body provided on the top of the traveling body so as to be able to swivel, a working machine attached to the swiveling body, a hydraulic actuator that drives the working machine, a hydraulic pump that discharges pressure oil that drives the hydraulic actuator, An electric motor for driving a hydraulic pump, a control panel for adjusting electric power supplied to the electric motor, a cable for connecting the control panel and an external power source, a column erected on the upper part of the revolving structure, and a cable bracket for holding the cable The cable bracket is an electrically driven hydraulic excavator having a shaft that is erected on the top of the support column and extends vertically, and a cable holding member that is rotatably provided around the shaft.
The cable holding member includes a first opening that opens on the rear end side of the revolving unit with respect to the shaft, and a second opening that opens on the opposite side of the first opening across the shaft. A cable insertion passage formed in an upwardly convex arcuate shape;
The cable extending from the external power source is passed through the cable insertion path from the rear end side of the revolving structure through the first opening, and is taken out from the second opening to the front side of the shaft. An electrically driven hydraulic excavator configured to be connected to a control panel.   2. The electrically driven hydraulic excavator according to claim 1, wherein the cable insertion passage is formed in a symmetrical shape with respect to the axis. The electrically driven hydraulic excavator according to claim 1,
A portion extending from the upper surface to the rear surface of the outer wall of the revolving body covers a power chamber that houses the hydraulic pump and the electric motor, and opens and closes the power chamber by rotating the rear portion up and down with the front portion as a fulcrum. Comprising
The electrically driven hydraulic excavator is characterized in that the support column is formed in a shape inclined backward so as to avoid a movable region of the working machine and the opening / closing lid.   2. The electrically driven hydraulic excavator according to claim 1, further comprising a stopper that limits a movable range of the cable holding member.

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