JP6769918B2 - Cable bracket for electrically driven work machines - Google Patents

Description

The present invention relates to a cable bracket of an electrically driven work machine in which an electric motor drives a hydraulic pump that discharges pressure oil that drives an actuator. In particular, the present invention relates to a cable bracket of an electrically driven work machine in which a swivel body to which a work machine is attached swivels on an upper part of a traveling body.

When excavating work in tunnels, indoors, shafts, underground, etc., electricity is used to drive a hydraulic pump that discharges pressure oil that drives actuators instead of engine-driven work machines that emit exhaust gas. Driven work machines may be used. Some electrically driven work machines have a support column with a rotatable cylindrical rotating body attached to the tip of the rotating body, and an arm that supports cables attached to the rotating body (see Patent Document 1 and the like). .. In this work machine, a cable for power supply connected to a generator or the like is hung on an arm or a support and connected to the electric motor so that the cable is not trampled by the track of the work machine or the like.

Jikkensho 51-12006 Gazette

An electrically driven work machine as in Patent Document 1 (hereinafter, when the term "working machine" is used without particular notice, the term refers to an electrically driven work machine) refers to a support column via a rotating body. The arm rotates 360 degrees freely. However, if the arm is configured to rotate freely 360 degrees, for example, if the turning direction of the swivel body during work is biased, the cable may be wound around the support column and pulled.

An object of the present invention is to provide a cable bracket for an electrically driven work machine capable of protecting a cable by suppressing the cable for power supply from winding around a support column.

In order to achieve the above object, a traveling body, a rotating body rotatably provided on the upper part of the traveling body, a working machine attached to the turning body, a hydraulic actuator for driving the working machine, and a pressure for driving the hydraulic actuator. In a cable bracket that includes a hydraulic pump that discharges oil and an electric motor that is a prime mover for driving the hydraulic pump, and is attached to an electrically driven work machine that is driven by electric power supplied from an external power source via a cable. A base attached to the upper part of the swivel body, an arm that supports the cable and is rotatably attached to the base and extends diagonally upward in a cantilever shape with respect to the base. wherein mounted on a base provided with a stopper for restricting the rotation range of the arm, a plurality of bolt holes for attaching the stopper has been made form on an arc around the turning center of the arm in said base, said base rotation range of the arm the mounting position of the stopper by changing over the arc selectively changeable der respect is, on the arm, in a position to come on the circular arc forming the plurality of bolt holes through holes are provided, and wherein Rukoto the arm relative to the base by screwing the bolt into any of the plurality of bolt holes through the through hole is configured to be non-rotatably fixed To do.

According to the present invention, it is possible to protect the cable by suppressing the cable for power supply from being wound around the support of the cable bracket during the operation of the electrically driven work machine.

It is a side view which shows the whole structure of the system which used the electric drive type work machine which concerns on 1st Embodiment of this invention. It is a side view of the cable bracket provided in the electric drive type work machine shown in FIG. It is a top view of the cable bracket provided in the electric drive type work machine shown in FIG. It is a bird's-eye view (perspective view) of the cable bracket provided in the electric drive type work machine shown in FIG. It is a top view (perspective view) of the cable bracket provided in the electric drive type work machine shown in FIG. It is a side view of the lower member of the base of the cable bracket shown in FIG. It is a side view of the upper member of the base of the cable bracket shown in FIG. It is a bottom view of the upper member of the base of the cable bracket shown in FIG. It is an exploded view of the upper part of the cable bracket shown in FIG. It is the bottom view of the top view of the stopper of the cable bracket shown in FIG. It is a bottom view of the cable bracket excluding the lower member shown in FIG. It is the figure which showed the state which the stopper of the cable bracket shown in FIG. 2 hit a cushioning member. It is a side view which shows the whole structure of the system which used the electric drive type work machine which concerns on 2nd Embodiment of this invention. It is a side view which shows the whole structure of the system which used the electric drive type work machine which concerns on 3rd Embodiment of this invention.

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

(First Embodiment)
1. 1. System FIG. 1 is a side view showing an overall configuration of a system using an electrically driven work machine according to a first embodiment of the present invention. The system shown in the figure includes an electrically driven work machine (hereinafter, work machine) 100 and a power supply 200. Unless otherwise specified in the following description, the front of the driver's seat of the work machine 100 (left in FIG. 1) is the front.

2. Electric drive type work machine The work machine 100 is a work machine in which an electric motor is mounted instead of an engine (internal combustion engine) as a prime mover for driving a hydraulic pump, and the electric motor is driven by electric power supplied from an external power source. The work machine 100 may be provided with a battery for driving the electric motor, but in the present embodiment, it is assumed that the battery for driving the electric motor is not provided. The work machine 100 includes a vehicle body 110 and a work machine (front work machine) 150 attached to the vehicle body 110. The vehicle body 110 includes a traveling body 120 and a turning body 130.

The traveling body 120 may be a wheel type traveling body, but in the present embodiment, it is a crawler type traveling body, and is a truck frame 121, a driven wheel (idler) 122, a drive wheel 123, a crawler (track) 124, and a traveling drive. The device 125 is provided.

Although not shown, the track frame 121 is formed in an H shape when viewed from above, and rotatably supports the front driven wheels 122 on both the left and right sides and the drive wheels 123 on the rear. The output shafts of the traveling drive device 125 are connected to the shafts of the left and right drive wheels 123, respectively. The crawler 124 is hung around the driven wheels 122 and the driving wheels 123 on both the left and right sides. Further, a swivel body 130 is rotatably provided on the upper portion of the track frame 121 via a swivel wheel 126. The traveling drive device 125 includes a hydraulic motor. The traveling drive device 125 is driven in response to an operation of an operation lever device (not shown) in the driver's cab.

-Swivel body The swivel body 130 includes a swivel frame 131, a driver's cab 132, a counterweight 133, a power chamber 134, and the like.

The swivel frame 131 is a base frame of the swivel body 130 and is provided on the upper part of the track frame 121 via the swivel wheel 126 so that the swivel body 130 can swivel with respect to the traveling body 120 about the swivel center C. is there. A swivel motor (not shown) is mounted on the swivel frame 131 in the vicinity of the swivel wheel 126, and the output shaft of the swivel motor meshes with a gear provided on the swivel wheel 126 to engage the swivel body 120 with respect to the traveling body 120. 130 turns. An electric motor can be used as the swivel motor, but a hydraulic motor is used in this embodiment.

The driver's cab 132 is arranged at a position offset to one side (left side in the present embodiment) in the left-right direction with respect to the turning center C. The counter weight 133 is a weight for balancing the weight with the working machine 150, and is provided at the rear end of the swivel frame 131. The power chamber 134 is located between the cab 132 and the counterweight 133. In the power chamber 134, in addition to the electric motor 135 and the hydraulic pump 136, a heat exchanger such as a radiator and an oil cooler (not shown), and a valve unit for controlling the flow of pressure oil supplied from the hydraulic pump 136 to the hydraulic actuator, It houses hydraulic oil tanks, fuel tanks, etc. The electric motor 135 is a prime mover, and the hydraulic pump 136 is driven by the electric motor 135 to suck in the hydraulic oil in the hydraulic oil tank and discharge it as pressure oil. The engine (internal combustion engine) that drives the hydraulic pump 136 is not mounted on the work machine 100. The hydraulic pump 136 is located on the right side of the electric motor 135.

A control panel (not shown) is arranged on the swivel body 130, for example, at a position in front of the hydraulic pump 9. In an engine-driven hydraulic excavator, a fuel tank may be arranged in front of the hydraulic pump, but in the work machine 100, the fuel tank is omitted, so that a control panel can be installed here. This control panel is a device that receives power from the power supply 200 and other external power sources, and although not shown in particular, a breaker that shuts off and turns on the external power source as necessary, and electrically adjusts the frequency of the input power. It is equipped with an inverter device that can output power. The electric power adjusted by the inverter to the frequency corresponding to the rotation speed of the electric motor 135 is supplied to the electric motor 135 via the control panel. A cable bracket 1 (described later) for supporting the cable 201 for power supply by contact with the traveling body 120 is attached to the upper portion of the swivel body 130.

-Working machine The working machine 150 is an articulated front working machine including a working arm 151 and a bucket 154 as a working tool. The working arm 151 includes a boom 152, an arm 153, a boom cylinder 155, an arm cylinder 156, and a working tool cylinder 157. The boom 152 is rotatably connected to the front portion of the swivel body 130 in the vertical direction, the arm 153 is rotatably connected to the tip of the boom 152, and the bucket 154 is rotatably connected to the tip of the arm 153. Both ends of the boom cylinder 155 are connected to the swivel body 130 and the boom 152, and both ends of the arm cylinder 156 are connected to the boom 152 and the arm 153, respectively. The base end of the work tool cylinder 157 is connected to the arm 153, while the tip end is connected to the tip end portion of the arm 153 and the bucket 154 via a link 158. The boom cylinder 155, the arm cylinder 156, and the work tool cylinder 157 are all hydraulic actuators, which are driven by the pressure oil discharged from the hydraulic pump 136, and drive the work machine 150 by the expansion / contraction operation. Other working tools such as breakers, buckets, magnets, and clamshell buckets may be attached to the working arm 151 in place of the bucket 154.

3. 3. Power supply The power supply 200 is an external power source that supplies electric power to the electric motor 135 of the work machine 100, and is installed at an appropriate place such as the ground separately from the work machine 100. The power source 200 is, for example, a generator, which is driven by a built-in prime mover (internal combustion engine) to generate electric power. The power supply 200 and the work machine 100 are connected via a cable 201 as shown in FIG. Specifically, one end of the cable 201 is connected to the output portion of the power supply 200, and the other end is connected to the connection portion of the work machine 100 with the above-mentioned control panel. The length of the cable 201 is adjusted so as not to interfere with the operation of the work machine 100.

4. Cable bracket FIG. 2 is a side view of the cable bracket provided in the electrically driven work machine shown in FIG. 1, FIG. 3 is a plan view, FIG. 4 is a bird's-eye view (perspective view), and FIG. ). The cable bracket 1 shown in these figures includes a base 10, an arm 30, and a stopper 50.

-Base The base 10 is attached to the upper part of the swivel body 130, particularly near the swivel center C (the upper part of the driver's cab 132) in the present embodiment. The base 10 includes a lower member 11, an upper member 12, and a pin 13.

FIG. 6 is a side view of the lower member. As can be seen by referring to FIG. 6 and the previous drawings together, the lower member 11 is a tubular member that stands up and extends vertically, and the upper portion is open. A horizontal fixing plate 14 is attached to the lower part of the lower member 11 by welding or the like, and the lower member 11 is attached to the cab 132 by fixing the fixing plate 14 to the upper surface of the ceiling of the swivel body 130 with a fixture such as a bolt. Is attached. Ribs 15 are erected on the fixing plate 14 and the lower member 11, and the structural strength of the lower member 11 is improved. Further, the lower member 11 is provided with a plurality of (three in this example) pin holes 16 arranged vertically. Each pin hole 16 passes through the center of the lower member 11 and horizontally penetrates the lower member 11. That is, as shown in FIG. 2, two pin holes 16 are present on the peripheral wall of the lower member 11 with the center of the lower member 11 interposed therebetween.

FIG. 7 is a side view of the upper member, and FIG. 8 is a bottom view. As can be seen by referring to FIGS. 7 and 8 and the previous drawings, the upper member 12 is also a tubular member extending vertically like the lower member 11, and the lower part is open. The outer diameter of the upper member 12 is slightly smaller than the inner diameter of the lower member 11. The upper member 12 is provided with one pin hole 21. The pin hole 21 passes through the center of the upper member 12 and horizontally penetrates the upper member 12. That is, two pin holes 21 are present on the peripheral wall of the upper member 12 so as to face each other with the center of the upper member 12 interposed therebetween, like the pin holes 16 of the lower member 11. Further, a circular top plate 22 is attached to the upper portion of the upper member 12 concentrically with the upper member 12 by welding or the like. On the outer portion of the upper member 12 of the top plate 22, a plurality of bolt holes 23 (eight at intervals of 45 degrees in this example) are provided on a circle concentric with the upper member 12 (on a pitch circle) at regular intervals. Has been done. A columnar guide 24 concentric with the upper member 12 is attached to the center of the top plate 22. The guide 24 projects upward from the upper surface of the top plate 22, and the bolt holes 25 concentric with the pitch circles of the bolt holes 23 penetrate vertically.

The upper member 12 having the above configuration is inserted into the lower member 11, and the pin hole 21 of the upper member 12 is aligned with any of the upper and lower three-stage pin holes 16 of the lower member 11 and the pin 13 (FIG. 2) is inserted. , The upper member 12 is fixed to the lower member 11. That is, the base 10 can be expanded and contracted up and down by moving the upper member 12 up and down with respect to the lower member 11, and the height can be adjusted. The pin 13 inserted into the pin holes 16 and 21 is prevented from coming off by the fixing pin 26 (FIG. 2). Further, the pin 13 is provided with a grip 27. As shown in FIG. 2, if the pin hole 21 of the upper member 12 is aligned with the pin hole 16 of the lowermost member 11 and the base 10 is shrunk, the cable bracket 1 can be mounted on the loading platform of a transport vehicle such as a trailer. The total height of the work machine 100 including this is within the transportation limit height of public roads.

-Arm FIG. 9 is an exploded view of the upper part of the cable bracket. As can be seen by referring to FIG. 9 and the previous drawings together, the arm 30 is a member for supporting the cable 201 (FIG. 1) and is rotatably attached to the base 10. The arm 30 is formed of a rectangular steel plate in an arch shape, and includes a base portion 31 and an arm main body portion 32.

The base portion 31 is a horizontal plate-shaped portion facing the upper surface of the top plate 22 of the base 10, and is formed in a square shape in the present embodiment. A through hole 33 into which the guide 24 of the top plate 22 is inserted is provided in the substantially central portion of the base portion 31. The arm 30 is attached to the base 10 by passing the guide 24 through the through hole 33 and screwing the bolt 34 into the bolt hole 25 of the guide 24. At that time, a bolt 34 having a head diameter larger than the diameter of the through hole 33 (such as a bolt with a collar) is used. Alternatively, the bolt 34 is screwed in through a washer having an outer diameter larger than the diameter of the through hole 33. Since the guide 24 projects slightly upward from the upper surface of the base 31 of the arm 30 with the arm 30 mounted on the base 10, the tightened bolt 34 does not suppress the base 31 of the arm 30. .. That is, the base 31 of the arm 30 and the top plate 22 of the base 10 are in surface contact with each other on horizontal sliding surfaces (opposing surfaces), and the base 31 slides with respect to the top plate 22 of the base 10 with the guide 24 as a fulcrum. Then, the arm 30 is configured to rotate. At this time, in order to improve the slidability of the base 31 of the arm 30 and the top plate 22 of the base 10, the base 31 and the top plate 22 slide with each other as shown by the imaginary line (dashed line) in FIG. A resin sliding member 35 may be interposed between the moving surfaces. The sliding material 35 may be an ultra-thin sheet. However, when the guide 24 does not protrude from the upper surface of the arm 30 by interposing the sliding member 35, the arm 30 is sandwiched between the bolt 34 and the guide 24 so that the arm 30 is not restrained by the bolt 34. For example, due to a design change, the guide 24 is extended or a washer or shim having an outer diameter smaller than that of the through hole 33 is sandwiched between the bolt 34 and the guide 24 to prevent contact between the bolt 34 and the arm 30.

The arm main body 32 is a portion extending diagonally upward from the base 31 in a cantilever shape (relative to the base 10), and in the present embodiment, two square steel plates are connected in one direction with respect to the base 31. It has a structure that looks like it is joined by welding. In the present embodiment, the first steel plate welded to the base 31 is tilted at a predetermined angle with respect to the horizontal, and the second steel plate is tilted at a larger angle, whereby the arm body portion 32 is generally bow-shaped. Is formed in. A holder 36 is provided on each of the two steel plates of the arm main body 32 and the base 31. The holder 36 has an upper and lower half-split structure including a lower half portion 37 and an upper half portion 38. The lower half portion 37 and the upper half portion 38 are fixed to the upper surface of the arm main body portion 32 by welding or the like with bolts 41. A semicircular recess is formed on the facing surface of the lower half 37 and the upper half 38, and these recesses are combined to form a circular hole 42. The holes 42 of each holder 36 are opened so that the center line extends in the longitudinal direction of the arm main body 32, and the polygonal line drawn by the center lines is a bow shape along the arm main body 32. A cable 201 is passed through each hole 42, but the inner diameter of the hole 42 is larger than the outer diameter of the cable 201 so as not to restrain the cable 201.

The rib 43 is erected on the lower surface of the arm 30, and the structural strength of the arm 30 is enhanced. Further, the base 31 of the arm 30 is provided with one through hole 44 at a position on the pitch circle of the bolt hole 23 of the top plate 22 of the base 10. When transporting the work machine 100 or when it is not preferable for the arm 30 to move, the arm 30 is screwed into one of the bolt holes 23 through the through hole 44 as shown in FIG. Can be fixed non-rotatably.

-Stopper The stopper 50 limits the rotation range of the arm 30 with respect to the base 10, and is attached to the base 10.

FIG. 10 is a plan view of the stopper, and FIG. 11 is a bottom view of a portion of the base 10 excluding the lower member 11. As can be seen by referring to FIGS. 10 and 11 and the previous drawings, the stopper 50 includes a mounting portion 51 and a pin 52. The mounting portion 51 is a plate-shaped member, and a plurality of through holes 53 are provided at positions on the pitch circle of the bolt holes 23 of the top plate 22 of the base 10. The pitch of the through holes 53 is adjusted to match the bolt holes 23 of the top plate 22. As a result, the stopper 50 is fixed to the top plate 22 by screwing the bolt 54 (FIG. 2, etc.) passed through each through hole 53 into the corresponding bolt hole 23 so that the mounting portion 51 faces the lower surface of the top plate 22. Can be done. In the present embodiment, the attachment portion 51 of the stopper 50 is fixed to the lower surface of the top plate 22 in a direction in which the pin 52 projects toward the base portion 31 of the arm 30 (direction in which the pin 52 projects upward). With the stopper 50 fixed to the top plate 22, the pin 62 is located outside the outer circumference of the top plate 22 and is inserted into an elongated hole 46 (FIG. 4, etc.) provided in the base 31 of the arm 30. The elongated hole 46 is formed in an arc shape concentric with the pitch circle of the bolt hole 23. Therefore, the rotation range of the arm 30 is limited to the central angle of the arc drawn by the elongated hole 46. In the present embodiment, the central angle of the arc drawn by the elongated hole 46 is about 90 degrees.

In the present embodiment, the bolt holes 23 of the top plate 22 of the base 10 form a mounting portion for mounting the stopper 50. In the present embodiment, since the bolt holes 23 are provided at a pitch of 45 degrees around the guide 24 (the turning center of the arm 30) at a pitch of 45 degrees, there are eight mounting positions of the stopper 50 with respect to the base 10. By changing the mounting position of the stopper 50 on the pitch circle of the bolt hole 23, the positional relationship of the rotation range of the arm 30 with respect to the swivel body 130 of the work machine 100 can be selectively changed. Further, in the present embodiment, a cushioning member 47 (FIG. 5 or the like) for softening the collision between the stopper 50 (pin 52) and the arm 30 (the end of the elongated hole 46) is provided so as to project from the lower surface of the base 31 of the arm 30. is there. In FIGS. 2, 4, 9 and 11, the cushioning member 47 has been removed. The cushioning member 47 is located on both sides of the elongated hole 46 in the rotational direction of the arm 30, and is shown in FIG. 12 before the pin 52 of the stopper 50 hits one end or the other end of the elongated hole 46. As shown, it collides with the attachment portion 51 of the stopper 50.

5. Operation The work machine 100 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 inside a tunnel, indoors, a shaft, or underground. When operating the work machine 100, first, the power supply 200 and the work machine 100 are connected by the cable 201. At that time, the upper half 38 of each holder 36 of the cable bracket 1 is attached and detached, and the cable 201 is passed through the hole 42. Further, at the working position of the work machine 100, the stopper 50 of the cable bracket 1 is attached to the attachment portion close to the power supply 200 with respect to the base 10, and the arm 30 is set so as to face the power supply 200 on average. After that, the power supply 200 is operated to start supplying electric power to the work machine 100, and the operator sits in the driver's seat of the driver's cab 132 of the work machine 100 and appropriately operates the operation device (not shown). As a result, the traveling body 120 can move the work machine 100, the working machine 150 can perform excavation work, and the swivel body 130 can be swiveled.

6. Effect (1) Since the work machine 100 moves or turns in small steps in the vicinity of the excavation site when performing excavation work or the like, the arm of the cable bracket 1 follows a change in the direction of the swivel body 130 with respect to the power supply 200. 30 swings in the horizontal direction. As a result, the change in the orientation of the arm 30 of the cable bracket 1 with respect to the power supply 200 becomes smaller than the change in the orientation of the swivel body 130 with respect to the power supply 200. Further, as described above, in the present embodiment, a plurality of bolt holes 23 for attaching the stopper 50 are formed on an arc centered on the turning center of the arm 30 on the base 10 (the center of the pitch circle of the bolt holes 23 is the arm 30). It coincides with the center of rotation). The fact that the direction of the arm 30 can be changed by changing the bolt hole 23 to which the stopper 50 is attached is largely due to this configuration. To change the orientation of the arm 30, it is not necessary to remove the base 10 from the cab 132, change the orientation of the cable bracket 1 itself, and reattach it to the cab 132. Therefore, the orientation of the arm 30 can be easily changed according to the positional relationship between the work machine 100 and the power supply 200. Therefore, the movement of the cable 201 accompanying the operation of the work machine 100 is suppressed, the cable 201 does not need to be loosened more than necessary, and the cable 201 can be less likely to be caught by the swivel body 130 or the work machine 150. In addition, since the arm 30 of the cable bracket 1 extends diagonally upward, it is also an advantage that the cable 201 once rises upward when viewed from the work machine 100 and is unlikely to interfere with the machine body. Then, since the cable 201 stands up in the vicinity of the cable bracket 1 due to the inclination of the arm 30, even if the swivel body 130 makes one rotation during the work, it is difficult for the cable 201 to wind around the base 10 of the cable bracket 1. Due to the above comprehensive effects, the cable 201 can be effectively protected according to the present embodiment.

(2) Since the base 31 and the base 10 are in contact with each other on horizontal sliding surfaces and the arm 30 slides on a flat surface with respect to the base 10 to rotate, no bearing is used for the rotating mechanism and grease is supplied. Since there is no need to do this, maintenance work can be reduced. Further, if the structure is such that the rotating shaft is supported by the bearing, a corresponding length of the rotating shaft for supporting by the bearing is required and the bending moment becomes large. However, in this embodiment, a long rotating shaft is not required. Bending moment is also suppressed.

(3) Since the base 31 of the arm 30 is plate-shaped and thin, the cable bracket 1 can be compactly configured and the weight can be suppressed.

(4) If a resin sliding member 35 is interposed between the sliding surfaces of the arm 30 and the base 10, the turning operation of the arm 30 can be made smoother.

(5) Further, if the cushioning member 47 is provided, the collision between the stopper 50 and the arm 30 can be alleviated, so that the life of the components of the cable bracket 1 can be extended and the maintenance burden of the cable bracket 1 can be reduced.

(6) Since the base 10 can be expanded and contracted up and down, when transporting the work machine 100 by a transport vehicle such as a trailer, even with the cable bracket 1 attached, it can be accommodated in the transport limit size of a public road, which accompanies transportation. The trouble of attaching and detaching the cable bracket 1 can be saved.

(Second Embodiment)
FIG. 13 is a side view showing the overall configuration of the system using the electrically driven work machine according to the second embodiment of the present invention. In the present embodiment, the same parts as those in the first embodiment are designated by the same reference numerals as those in FIG. 13 and the description thereof will be omitted. The system of this embodiment is different from the system of FIG. 1 in which the cable 201 is connected to the work machine 100 via the rail device 202 and the cable 201 of the power supply 200 is directly connected to the work machine 100 from the power supply 200. .. Regarding other points, the system according to the present embodiment and the system of FIG. 1 have the same configuration.

The system of this embodiment operates at a site having a ceiling such as inside a building or in a mine. The rail device 202 is provided on the ceiling of the site as a cable support. The rail device 202 includes a rail 203 provided on the ceiling of the site and a plurality of hangers 204 that can move along the rail 203. The cable 201 is supported by a plurality of suspenders 204. By using the rail device 202, in the system according to the present embodiment, the work machine 100 can move along the rail 203 under the rail 203 within a range where the looseness of the cable 201 allows. In this example, the length of the portion of the cable 201 that descends from the rail device 202 to the work machine 100 is constant. The present invention can be applied to such a system, and the same effect can be obtained.

(Third Embodiment)
FIG. 14 is a side view showing the overall configuration of the system using the electrically driven work machine according to the third embodiment of the present invention. In the present embodiment, the same parts as those in the first and second embodiments are designated by the same reference numerals as those in FIGS. 1 and 13 in FIG. 14, and the description thereof will be omitted. The difference between this embodiment and the systems of FIGS. 1 and 13 is the installation position of the cable bracket 1 with respect to the work machine 100. In the present embodiment, the cable bracket 1 is installed above the counterweight 133 in the swivel body 130 of the work machine 100. Other points are the same as the system of FIGS. 1 and 13. FIG. 14 illustrates a system using the rail device 202 as in the system of FIG. 13, but it goes without saying that the cable bracket 1 can be similarly relocated even in the system of FIG. 1 without the rail device 202.

In the first embodiment, the case where the cable bracket 1 is installed above the driver's cab 132 with the intention of installing it near the turning center C of the swivel body 130 has been described as an example, but the position of the cable bracket 1 is the swivel body 130. It can be changed as appropriate at the top of. Even if the cable bracket 1 is installed on the counterweight 133 as illustrated in the present embodiment, the same effect as in the first embodiment can be obtained.

(Modification example)
In the above embodiment, the arm 30 is formed in a plate shape in order to obtain the above effect (3), but the arm 30 does not have to be in a plate shape as long as the essential effect (1) is obtained. Further, although an example of installing the sliding member 35 in order to obtain the above effect (4) has been described, the sliding member 35 can be omitted as long as the essential effect (1) is obtained. Although an example of installing the cushioning member 47 in order to obtain the above effect (5) has been described, the cushioning member 47 can be omitted as long as the essential effect (1) is obtained. In addition, the base 10 is provided with an expansion / contraction mechanism in order to obtain the effect (6), but the expansion / contraction mechanism of the base 10 can be omitted as long as the essential effect (1) is obtained.

Further, although the hydraulic excavator has been described as an example of an electrically driven work machine, any work machine in which a swivel body is installed on a traveling body can be used for other types of electrically driven work machines such as an electrically driven crane. The present invention is applicable.

1 ... Cable bracket, 10 ... Base, 23 ... Bolt hole (mounting part to attach stopper), 30 ... Arm, 35 ... Sliding material, 47 ... Buffer member, 50 ... Stopper, 100 ... Work machine (Electric drive type work machine) ), 120 ... traveling body, 130 ... swivel body, 135 ... electric motor (motor), 136 ... hydraulic pump, 150 ... working machine, 155 ... boom cylinder (hydraulic actuator), 156 ... arm cylinder (hydraulic actuator), 157 ... work Tool cylinder (hydraulic actuator), 200 ... power supply (external power supply), 201 ... cable

Claims (5)

A traveling body, a swivel body provided so as to be swivel on the upper part of the traveling body, a working machine attached to the swivel body, a hydraulic actuator for driving the working machine, a hydraulic pump for discharging pressure oil for driving the hydraulic actuator, and In a cable bracket provided with an electric motor that is a prime mover for driving the hydraulic pump and attached to an electrically driven work machine in which the electric motor is driven by electric power supplied from an external power source via a cable.
With the base attached to the upper part of the swivel body,
An arm that supports the cable and is rotatably attached to the base and extends diagonally upward in a cantilever shape with respect to the base.
A stopper attached to the base to limit the rotation range of the arm
Wherein and the plurality of bolt holes for attaching the stopper is made form an arc on around the turning center of the arm in said base, said arm by changing the mounting position of the stopper relative to the base on the circular arc Ri rotation range is selectively changeable der,
The arm is provided with a through hole at a position on the arc on which the plurality of bolt holes are formed, and the bolt is screwed into one of the plurality of bolt holes through the through hole to the base. electrically driven working machine cable bracket characterized that you have been configured such that the arm is non-rotatably fixed Te. In the cable bracket of the electrically driven work machine according to claim 1, at least the base of the arm is plate-shaped, and the arm and the base are in contact with each other on horizontal sliding surfaces, and the arm is in contact with the base. Cable brackets for electrically driven work machines that slide and turn. The cable of the electric drive type work machine according to claim 2, wherein a resin sliding material is interposed between the sliding surfaces of the arm and the base. bracket. The cable bracket of the electric drive type work machine according to claim 1, wherein the cable bracket of the electric drive type work machine is provided with a shock absorbing member for softening a collision between the stopper and the arm. The cable bracket for an electrically driven work machine according to claim 1, wherein the base is vertically expandable and contractible.

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