JP2011196071A - Electric construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric construction machine in which a collector can be disposed on a center joint and which can secure the preset minimum ground clearance of a lower structure.SOLUTION: This electric construction machine includes the lower structure, an upper structure mounted on the lower structure so as to be revolved through a revolving ring, the center joint which is positioned at the center axis of the revolving ring, the outer cylinder of which is fixed to the lower structure side, and in which an outer cylinder and a shaft installed on the center axis of the inner cylinder are fixed to the upper structure side, and the collector which is installed on the underside of the center joint and which connects the wiring of the lower structure side and the wiring of the upper structure side. The collector includes a disk-like rotor connected to the bottom end of the shaft so as to be positioned in a plane orthogonal to the axis of the shaft, a plurality of concentric grooves with different diameters which are formed on the upper surface of the rotor, a plurality of slip rings disposed in the plurality of grooves, respectively, and a plurality of sliding bodies which are fixed to the lower structure side and brought into slidable contact with the plurality of slip rings, respectively.

Description

  The present invention relates to an electric construction machine, and more particularly to an electric construction machine that receives power from an external power source.

  In general, as an electric construction machine, for example, an electric hydraulic excavator that is connected to a power source such as an AC power source or a generator installed outside a vehicle and is powered by the power source is known.

  In this type of electric construction machine, in order to supply electric power from the outside to the electric motor in the turning body even when the turning body on the traveling body turns, the electric system on the traveling body side and the turning body side A current collector for electrically connecting the electric system so as to be rotatable is disposed at a center joint portion at a connecting portion between the traveling body and the revolving body.

  This current collector is composed of a plurality of rotating disks arranged in the vertical direction, an annular conductor provided on the outer periphery of each rotating disk, and a current collector that is in sliding contact with the annular conductor.

  And when arrange | positioning a current collector in a center joint part, in order to ensure the space in a turning body, the policy which arrange | positions a current collector under a center joint part is generally employ | adopted (for example, (See Patent Document 1).

Japanese Patent Laying-Open No. 2008-8809 (FIG. 7)

  In construction machines, the traveling body is composed of a traveling body frame and legs provided on the side of the traveling body frame, and the height from the ground surface to the lower surface of the traveling body frame (minimum ground height) is The height of the lower surface of the traveling body frame is set in advance so as not to collide with an obstacle on the ground.

  However, in the conventional electric construction machine described above, on the lower side of the center joint arranged in the vertical direction, a plurality of rotating disks arranged in the vertical direction, an annular conductor provided on the outer periphery of each rotating disk, and this Since a current collector including a current collector that is in sliding contact with the annular conductor is disposed, a lower portion of the current collector protrudes in the ground direction from the lower surface of the traveling body frame. As a result, the above-described minimum ground height is lowered.

  If it is going to avoid this point, measures, such as enlarging the height of the leg part which comprises a traveling body, are required, and there exists a problem that the total height of a construction machine will also become high.

  The present invention has been made in order to solve the above-described problems, and the object thereof is to set the traveling body in advance without increasing the overall height of the construction machine, in which the current collecting device can be disposed at the center joint. It is an object of the present invention to provide an electric construction machine that can ensure the minimum ground clearance.

  In order to achieve the above object, the first aspect of the present invention is a lower traveling body, an upper revolving body that is mounted on the lower traveling body through a swirling wheel so as to be able to swivel, and a position on the central axis of the swirling wheel. The outer cylinder is fixed to the lower traveling body side, the inner cylinder and the shaft provided on the central axis of the inner cylinder are provided to the center joint fixed to the upper swing body side, and provided below the center joint. In the electric construction machine provided with a current collector for connecting the wiring on the lower traveling body side and the wiring on the upper swing body side, the current collector is located in a plane orthogonal to the axis of the shaft. A disc-shaped rotating body connected to the lower end of the shaft, a plurality of concentric grooves of different diameters provided on the upper surface of the rotating body, and a plurality of slips respectively disposed on the plurality of grooves Fixed to the ring and the lower traveling body side It is intended to each of the plurality of slip rings and a plurality of sliding body in sliding contact.

  The second invention is characterized in that, in the first invention, the rotating body of the current collector is arranged inside a frame of the lower traveling body.

  Furthermore, the third invention is characterized in that, in the first or second invention, the lower traveling body side wiring is connected to the sliding body, and the upper revolving body side wiring is connected to the slip ring.

  According to a fourth invention, in any one of the first to third inventions, a flange member is provided at an axial center portion of the rotating body of the current collector, and a lower end of the shaft and the flange member are connected to each other. And a connecting member that is bolted in a concentrically positioned and fitted state.

  Further, a fifth invention is characterized in that, in any one of the first to fourth inventions, the current collector includes an adjusting means for adjusting a sliding contact state between the sliding body and the slip ring. To do.

  The sixth invention is characterized in that, in any one of the first to fifth inventions, a connector for connecting an external power source is provided on the rear side of the lower traveling body.

  According to the present invention, the member on the power receiving side constituting the current collector is a rotating body, and this rotating body is disposed in the center frame below the center joint so as to be orthogonal to the axis of the center joint. The preset minimum ground height of the traveling body can be ensured without increasing the overall height of the machine. As a result, even in a workplace where obstacles and the like are scattered, collision between the lower surface of the traveling body frame and the obstacle on the ground can be avoided, and the workability of the electric construction machine can be improved.

1 is a side view showing an embodiment of an electric construction machine according to the present invention. It is an enlarged side view of the track frame which constitutes one embodiment of the electric construction machine of the present invention. It is a bottom view of the track frame which constitutes one embodiment of the electric construction machine of the present invention. FIG. 4 is an enlarged cross-sectional view of the track frame shown in FIG. 3 as viewed from an arrow IV-IV. FIG. 5 is an enlarged longitudinal sectional view of the track frame shown in FIG. 3 as viewed from arrows VV. It is a top view of the rotary body of the current collector which comprises one embodiment of the electric construction machine of the present invention. It is a longitudinal cross-sectional view which shows the connection of the rotary body of the current collector which comprises one Embodiment of the electric construction machine of this invention, and a center joint shaft. It is the top view which looked at the current collector shown in FIG. 6 from the VII-VII arrow. It is an enlarged side view which expands and shows the structure of the rotary body and sliding body of the current collector shown in FIG. 4b. It is the cross-sectional view which looked at the rotary body and sliding body of the current collector shown in FIG. 8 from the IX-IX arrow.

Hereinafter, embodiments of the electric construction machine of the present invention will be described with reference to the drawings.
FIG. 1 is a side view showing an embodiment of an electric construction machine according to the present invention, FIG. 2 is an enlarged side view of a track frame constituting an embodiment of the electric construction machine according to the present invention, and FIG. FIG. 4A is an enlarged cross-sectional view of the track frame shown in FIG. 3 as viewed from the arrow IV-IV, and FIG. 4B is the track shown in FIG. FIG. 5 is a plan view of a rotating body of a current collector that constitutes an embodiment of an electric construction machine according to the present invention.

  In FIG. 1, reference numeral 1 denotes a hydraulic excavator as an electric construction machine. The electric excavator 1 includes a lower traveling body 2 provided on a lower side of a vehicle body and a swiveling wheel 3 provided on the lower traveling body 2. And an upper revolving body 4 that is turnably mounted on the swivel wheel 3 and a front device 5 that is attached to the front part of the upper revolving body 4 so as to be rotatable in the vertical direction (movable up and down). It is configured. The vehicle body of the electric excavator 1 includes a frame on the lower traveling body 2 side, a frame on the upper swing body 4 side, and the like.

  The upper swing body 4 includes a swing frame 6 formed as a support structure, a counterweight 7 provided at the rear end portion of the swing frame, a cab 8 provided on the front side of the counterweight 7, and the swing frame 6. The motor 9, the control device 10, the hydraulic pump 11, and other devices provided above are roughly configured.

  An electric motor 9 serving as a power source of the electric hydraulic excavator 1 is composed of, for example, an electric motor driven by a three-phase AC power source, and drives the hydraulic pump 11 by being supplied with power from an external power source via the control device 10. Is. The control device 10 controls the amount of power supplied from the external power source to the electric motor 9 according to, for example, an operator's operation.

  A hydraulic pump 11 that constitutes a hydraulic pressure source together with a tank (not shown) is driven by an electric motor 9 and discharges hydraulic oil in the tank as pressure oil.

  As shown in FIGS. 2 to 4 b, the track frame 12 serving as the frame of the lower traveling body 2 is roughly composed of a center frame 13 positioned at the center and side frames 20, 20 positioned on the left and right sides of the center frame 13. It is configured.

  As shown in FIG. 3, the center frame 13 constituting the center portion of the track frame 12 has a main body portion and a leg portion, and is formed of a plate material such as a steel plate so as to be substantially H-shaped in plan view. Further, as shown in FIGS. 4a and 4b, the internal structure is located in the upper and lower plates 14 and 15 facing each other in the vertical direction, and in the center between the upper plate 14 and the lower plate 15, welding means. The cylindrical tube plate 16 fixed between the two and the outer peripheral side of the tube plate 16 is extended toward the side frame 20, and is fixed between the upper plate 14 and the lower plate 15 by welding means. This is a hollow structure composed of a plurality of vertical plates 17, 17,.

  A round cylinder 18 made of a cylindrical tube is fixed to the upper surface of the central portion of the upper plate 14 by welding or the like, and the circular cylinder 18 projects upward from the upper plate 14. Further, an annular support plate 19 is fixed to the upper end of the circular cylinder 18 by welding or the like in order to support the lower surface side of the swivel wheel 3 of FIG. 1 from below.

  Here, at the center of the lower plate 15, as shown in FIGS. 4a and 4b, a circular inspection opening 15A is provided at a position below the center joint 25 described later. A circular opening 14 </ b> A is also provided in the central portion of the upper plate 14 at a position facing the inspection opening 15 </ b> A in the vertical direction.

  The side frames 20 and 20 provided on the left and right sides of the center frame 13 and extending in the front-rear direction of the vehicle body are formed as frames having a substantially U-shaped cross section as shown in FIG. 4a. As shown in FIG. 3, these side frames 20 are fixed to the left and right ends of the center frame 13 by welding or the like, and extend in the front-rear direction.

  An idler wheel bracket 20A is provided on one side of each side frame 20 in the front-rear direction, and a drive wheel bracket 20B is provided on the other side. As shown in FIG. 1, the idler wheel 21 is rotatably provided in the idler wheel bracket 20A, and the drive wheel 22 is provided in the drive wheel bracket 20B.

  The left and right side frames 20 are each provided with a crawler belt 23 wound between the idler wheel 21 and the drive wheel 22. By driving the crawler belt 23 through the drive wheels 22 with a traveling motor (not shown) or the like, the electric excavator 1 can stably travel even in muddy or rough terrain.

  Reference numeral 24 denotes a mounting bracket which is located on the upper side of the circular cylinder 18 and is detachably provided on the inner peripheral side of the support plate 19. The mounting bracket 24 constitutes a mounting plate for mounting a center joint 25 described later to the track frame 12 of the lower traveling body 2.

  A center joint 25 is provided between the lower traveling body 2 and the upper swing body 4. The center joint 25 constitutes a rotary joint of a hydraulic system used for supplying and discharging pressure oil between the lower traveling body 2 and the upper swing body 4, and an outer cylinder 25A serving as an outer joint portion. And an inner cylinder 25B as an inner joint part, which is provided so as to be relatively rotatable in the outer cylinder 25A and whose upper side protrudes upward from the outer cylinder 25A.

  The center joint 25 is disposed on the turning center axis OO of the turning wheel 3 as shown in FIGS. 4a and 4b, and the upper end side of the outer cylinder 25A is attached to the support plate 19 of the track frame 12 via the mounting bracket 24. (Circle 18) etc. are fixedly provided. Further, a through hole is provided in the center of the inner cylinder 25B in the axial direction, and a center joint shaft 25C is fitted into the through hole. The inner cylinder 25B and the center joint shaft 25C protrude upward from the mounting bracket 24, and the protruding portion is fixed to the upper swing body 4 side shown in FIG. At the lower end of the center joint shaft 25C, there are holes for inserting set screws, which will be described later, at four locations on the outer periphery of the center joint shaft 25C through which two straight lines perpendicular to the axis O in the axial direction pass. 25C1, 25C1, 25C1,... Are provided (see FIG. 6).

  When the upper turning body 4 is driven to turn on the lower traveling body 2 via the turning wheel 3 (see FIG. 1), the center joint 25 rotates the inner cylinder 25B relative to the outer cylinder 25A. Therefore, the pressure oil is allowed to flow between the two. Thereby, for example, the pressure oil is supplied to and discharged from a traveling hydraulic motor or the like provided in the lower traveling body 2.

  A current collector 26 is provided between the lower traveling body 2 and the upper swing body 4. The current collector 26 is coaxially disposed, for example, below the center joint 25, and can rotate the electrical system on the upper swing body 4 side and the electrical system on the lower traveling body 2 side about the axis OO. To connect.

  Here, the current collector 26 is attached to, for example, the lower end portion of the center joint shaft 25C of the center joint 25, and is in a plane perpendicular to the axis OO in the cylindrical plate 16 of the center frame 13 of the lower traveling body 2. And a plurality of sliding bodies 29 attached to the upper plate 14 side of the center frame 13. As shown in FIG. 5, the rotating body 27 is provided with four concentric grooves 27A, 27A, 27A,... Having different diameters on the upper surface, and a conductive annular plate on the grooves 27A. Are provided with four slip rings 28, 28, 28,. The sliding bodies 29, 29, 29,... Are made of four conductive members, and are arranged so as to be in sliding contact with the upper surface side of each slip ring 28 described above.

  The rotating body 27 is provided with four holes 27B for mounting the flange member 32, which will be described later, at four points on a circle concentric with the axis O on the inner side of the smallest diameter groove 27A. 27B, 27B... Are provided.

  Further, one end of the power receiving side wiring 30 is connected to each slip ring 28 from the lower surface portion of the rotating body 27. One end of the power supply side wiring 31 is individually connected to each sliding body 29. When the upper swing body 4 is swung on the lower traveling body 2 and each slip ring 28 and the power receiving side wiring 30 are rotated around the axis OO in accordance with the swiveling operation, the power receiving side wiring 30 is Each slip ring 28 and the sliding body 29 are maintained in a state of being electrically connected to the power supply side wiring 31.

  The other end of the power receiving side wiring 30 is connected to the electric motor 9 through the control device 10 through the inner peripheral side of the center joint shaft 25C of the center joint 25.

  Further, as shown in FIG. 3, the other end of the power supply side wiring 31 extends, for example, from the position of the current collector 26 to the cable pipe 31 </ b> A provided under the lower plate 15 through the center frame 13 of the track frame 12. The connector 31B is connectable to an external power source (not shown).

Next, a detailed configuration of the above-described current collector 26 will be described in detail with reference to FIGS.
FIG. 6 is a longitudinal sectional view showing the connection between the rotating body of the current collector and the center joint shaft constituting one embodiment of the electric construction machine of the present invention, and FIG. 7 shows the current collector shown in FIG. FIG. 8 is an enlarged side view showing an enlarged configuration of a rotating body and a sliding body of the current collector shown in FIG. 4b, and FIG. 9 is a rotating body of the current collector shown in FIG. It is the cross-sectional view which looked at the sliding body from the IX-IX arrow. 6 to 9, the same reference numerals as those in FIGS. 1 to 5 are the same parts, and detailed description thereof is omitted.

First, the connection between the disk-shaped rotating body 27 and the center joint shaft 25C will be described.
6 and 7, reference numeral 32 denotes a flange member that forms a connecting portion of the rotating body 27. The flange member 32 includes a cylindrical portion 32A and a flange portion 32B formed in the lower radial direction of the cylindrical portion 32A. And set screw insertion holes 32C, 32C, 32C,... Are provided at four locations on the outer periphery of the cylindrical portion 32A through which two straight lines perpendicular to the axial center O in the axial direction pass. Centering reamer bolt holes 32D, 32D, 32D,... For attaching the rotating body 27 are formed at four positions on the circle concentric with the axial center O of the 32B and the adjacent holes are equidistant. Has been.

  The outer diameter of the cylindrical portion 32A of the flange member 32 is the same as that of the center joint shaft 25C described above. The flange member mounting hole 27 </ b> B of the rotating body 27 and the centering reamer bolt hole 32 </ b> D of the flange member 32 are aligned and fixed, and then fixed by the centering reamer bolt 33, so that the flange member 32 is concentrically on the rotating body 27. Can be fixed to the shape.

  Reference numeral 34 denotes a connecting pipe as a short cylindrical connecting member that connects the center joint shaft 25C and the flange member 32. The connecting pipe 34 has an inner diameter substantially the same as the outer diameter of the center joint shaft 25C and the flange member 32, and is slightly different. Largely formed. Moreover, as shown in FIG. 7, in the outer peripheral part of the connection pipe 34, the four screw sections through which two straight lines perpendicular to the axial center O in the axial direction pass each have a rectangular cross-section set screw fastening surface. 34A, 34A, 34A,... Are formed. On the four set screw fastening surfaces 34A, a center joint shaft fixing set screw mounting hole 34B is formed at the upper part, and a flange member fixing set screw mounting hole 34C is formed at the same height at the lower part.

  The cylindrical portion 32A of the flange member 32 fixed on the rotating body 27 is inserted from the lower part of the connection pipe 34, and the set screw insertion hole 32C of the flange member 32 and the set screw mounting hole for fixing the flange member of the connection pipe 34 are inserted. The flange member 32 and the rotating body 27 can be concentrically fixed to the connecting pipe 34 by screwing the set screw 35 after positioning with the 34C.

  After the lower end of the center joint shaft 25C is inserted from the upper part of the connection pipe 34, the set screw insertion hole 25C1 of the center joint shaft 25C and the set screw mounting hole 34B for fixing the center joint shaft of the connection pipe 34 are positioned and positioned. The center joint shaft 25 </ b> C can be concentrically fixed to the connecting pipe 34 by screwing the set screw 35. As a result, the axis center of the center joint shaft 25 </ b> C and the axis center of the rotating body 27 can be matched, and can rotate integrally within the cylindrical plate 16 of the center frame 13 of the lower traveling body 2.

Next, the structure of the sliding body 29 and the slip ring 28 of the current collector 26 will be described with reference to FIGS. 8 and 9, the same reference numerals as those shown in FIGS. 4a, 4b, and 5 are the same parts.
Reference numeral 36 denotes a sliding body support member that fixes the sliding body 29 to the upper plate 14 of the center frame 13. The sliding body support member 36 is formed using a plate material such as a steel plate, and is placed on the upper plate 14 on the front side of the lower traveling body 2 and tightened with a bolt or the like (not shown) as shown in FIGS. A fixed portion 36A that is fixed in a fixed manner, and a shaft mounting portion 36B that is formed on the side facing the center joint 25 by bending the plate member extending from the fixed portion 36A at a right angle downward at the opening 14A portion of the upper plate 14; A bolt mounting portion 36C made of a long rectangular plate fixed so as to stand upright on the shaft mounting portion 36B, and a sliding body holder which is rotatably supported at one end by the shaft mounting portion 36B and at the other end by the bolt mounting portion 36C. 38 and a shaft 37 that constitutes a support structure.

  The sliding body 29 is, for example, a rectangular parallelepiped brush made of carbon, and slides on the upper parts of the four slip rings 28 fixed to the four groove portions 27A of the rotating body 27 as shown in FIG. Four are arranged. 8 and 9 show only one sliding body 29. FIG.

  Reference numeral 38 denotes a sliding body holder that holds the upper portion of the sliding body 29. The sliding body holder 38 is formed of, for example, a glass epoxy material that is an insulating member, and a substantially rectangular parallelepiped to which the sliding body 29 can be fitted on the lower surface on the tip side. Are formed, and two flanges 38C and 38C having a through hole 38B through which the shaft 37 passes are provided on the rear end side. Thereby, the slide body holder 38 can be rotated around the shaft 37.

  Reference numeral 39 denotes a lever. The lever 39 is a quadrangular columnar member, and one end of the lever 39 is rotatably provided on the shaft 37 between the flanges 38C and 38C.

  Reference numeral 40 denotes a coil-shaped spring. The coil-shaped spring 40 applies a biasing force so that the sliding body 29 is slidably contacted with the slip ring 27 via the sliding body holder 38, and the side surface of the flange 38 </ b> C and the lever 39. Each is installed in between. One end of the coiled spring 40 is locked to an engagement groove 40A provided on the side surface of the lever 39, and the other end is locked to an engagement groove 38D provided on the side surface of the flange 38C.

  41 is an adjusting bolt for adjusting the sliding contact state of the sliding body 29. The adjusting bolt 41 is screwed into the bolt mounting portion 36C of the sliding body supporting member 36 via the lock nut 42, and the back surface of the lock nut 42 mounting surface. The front end of the lever 40 protrudes from the lever 40 and is in contact with the rear surface of the lever 40. By adjusting the amount of protrusion of the adjustment bolt 41 from the bolt mounting portion 36 </ b> C, the distance between the rear surface portion of the lever 40 and the bolt mounting portion 36 </ b> C of the sliding body support member 36 can be adjusted.

  Reference numeral 42 denotes a lock nut that prevents the adjustment bolt 41 from loosening, and is provided on the adjustment bolt 41 so as to contact the back surface of the bolt mounting portion 36C.

  Here, the method for attaching the sliding body 29 to the sliding body support member 36 will be described. First, the upper portion of the sliding body 29 is fitted into the recess 38 </ b> A of the sliding body holder 38. Next, the lever 39 is fitted between the flanges 38C and 38C of the sliding body holder 38 so that the through holes communicate with each other. At this time, one end of the spring 40 is engaged with the engaging groove 40A of the lever 39 and the other end is disposed. Engage with the engaging groove 38D of the flange 38C. Next, the sliding body holder 38 and the lever 39 are arranged so that the shaft 37 fits into the through hole 38 </ b> B of the sliding body holder 38 and the through hole of the lever 39. Next, the adjustment bolt 41 is screwed into the bolt mounting portion 36 </ b> C, and the tip end portion of the adjustment bolt 41 is brought into contact with the rear surface portion of the lever 39. The amount of protrusion of the adjustment bolt 41 from the bolt mounting portion 36C is adjusted so that an appropriate sliding contact state between the sliding body 29 and the slip ring 28 is obtained.

  That is, in FIG. 9, for example, when the amount of protrusion of the tip of the adjustment bolt 41 from the bolt mounting portion 36 </ b> C is increased, the rear surface portion of the lever 39 is pressed rightward. The sliding body holder 38 is engaged with the lever 39 by the spring 40 and is pivotally supported by the shaft 37. Therefore, the sliding body holder 38 rotates clockwise around the axis of the shaft 37. As a result, the sliding body 29 fitted to the sliding body holder 38 also rotates in the same manner and moves to the slip ring 28 side (downward).

  Conversely, when the amount of protrusion of the adjustment bolt 41 from the bolt mounting portion 36 </ b> C is reduced, the sliding body 29 moves to the upper side of the slip ring 28. Next, the lock nut 42 is tightened so that the adjustment bolt 41 does not loosen, and is brought into contact with the back surface of the bolt mounting portion 36C.

  The lever 39, the coiled spring 40, and the adjusting bolt 41 described above constitute adjusting means and can adjust the sliding contact state between the sliding body 29 and the slip ring 28, so that periodic maintenance work can be performed. Can maintain an appropriate state for a long time.

Next, operation | movement of one Embodiment of the electric construction machine of this invention mentioned above is demonstrated.
First, a power cable from an external power source (not shown) is connected to the connector 31B disposed on the rear side of the center frame 13 shown in FIGS. 3 and 4a. As a result, the external power supply is applied to the sliding body 29 of the current collector 26 via the power cable and the power supply side wiring 31, and is supplied to the control device 10 by the slip ring 28, the power reception side wiring 30, and the like.

  When the operator performs a starting operation, power is supplied from the external power source to the electric motor 9 via the control device 10 to operate the electric motor 9, and the hydraulic pump 11 is driven by the electric motor 9. The pressure oil from the hydraulic pump 11 is supplied to a hydraulic actuator such as a traveling motor and a turning motor (not shown) via a center joint 25 and a hydraulic pipe, and these are driven to drive the lower traveling body 2 or the upper part. The swivel body 4 is swung in an arbitrary direction.

  According to the embodiment of the electric construction machine of the present invention described above, the member on the power receiving side constituting the current collector 26 is the rotating body 27, and this rotating body 27 is placed in the center frame 13 below the center joint 25. In addition, since it is arranged so as to be orthogonal to the axis of the center joint, the preset minimum ground height of the lower traveling body 2 can be ensured without increasing the overall height of the construction machine. As a result, it is possible to avoid a collision between the lower surface of the center frame 13 of the lower traveling body 2 and an obstacle on the ground even in a workplace where obstacles and the like are scattered, thereby improving the workability of the electric construction machine. it can.

  In the embodiment of the present invention, the example in which the sliding body support member 36 of the current collector 26 is disposed on the front side of the center frame 13 has been described. However, the present invention is not limited to this example. 36 may be arranged on the lateral side or the rear side of the center frame 13.

  Further, although the example in which the connector 31B connected to the external power source is disposed on the rear side of the center frame 13 has been described, the present invention is not limited thereto, and may be disposed on the side surface side of the side frame 20, for example. .

  In the embodiment of the present invention, the hydraulic excavator has been described as an example of the electric construction machine. .

DESCRIPTION OF SYMBOLS 1 Electric hydraulic excavator 2 Lower traveling body 3 Turning wheel 4 Upper turning body 5 Front device 6 Turning frame 9 Electric motor 10 Control device 11 Hydraulic pump 12 Track frame 13 Center frame 18 Round body 19 Support plate 20 Side frame 24 Mounting bracket 25 Center Joint 25A Outer cylinder (outer cylinder)
25B Inner cylinder (inner cylinder)
25C shaft (center joint shaft)
26 Current collector 27 Rotating body 28 Slip ring 29 Sliding body 30 Power receiving side wiring 31 Power feeding side wiring 32 Flange member 33 Centering reamer bolt 34 Connecting member (connecting pipe)
35 Set screw 36 Slider support member 38 Slider holder 39 Lever 40 Spring 41 Adjustment bolt

Claims (6)

A lower traveling body, an upper revolving body mounted on the lower traveling body through a swirl wheel so as to be capable of swiveling, and an outer cylinder fixed on the lower traveling body side, positioned on a central axis of the swirling wheel; A center joint fixed to the upper swing body side, a shaft provided on the center axis of the inner cylinder, and a lower joint body wiring and an upper swing body side wiring provided on the lower side of the center joint. In an electric construction machine provided with a current collector for connecting
The current collector is a disc-shaped rotating body connected to the lower end of the shaft so as to be located in a plane orthogonal to the axis of the shaft;
A plurality of concentric grooves having different diameters provided on the upper surface of the rotating body;
A plurality of slip rings respectively disposed on the plurality of grooves;
An electric construction machine, comprising: a plurality of sliding bodies fixed to the lower traveling body side and in sliding contact with the plurality of slip rings. The electric construction machine according to claim 1,
The electric construction machine, wherein the rotating body of the current collector is disposed inside a frame of the lower traveling body. The electric construction machine according to claim 1 or 2,
Connect the lower traveling body side wiring to the sliding body,
The electric construction machine, wherein the upper revolving structure side wiring is connected to the slip ring. In the electric construction machine according to any one of claims 1 to 3,
A flange member is provided at the axial center of the rotating body of the current collector,
An electric construction machine comprising: a connecting member that bolts in a state where the lower end of the shaft and the flange member are positioned and fitted concentrically. The electric construction machine according to any one of claims 1 to 4,
The current collector includes an adjusting unit that adjusts a sliding contact state between the sliding body and the slip ring. The electric construction machine according to any one of claims 1 to 5,
An electric construction machine characterized in that a connector for connecting an external power source is provided on the rear side of the lower traveling body.

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