JP4026515B2 - Work machine and slip ring for work machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hydraulic excavator, a working machine such as an excavator configured using the hydraulic excavator as a base body, and a slip ring for electrical wiring connection used in the working machine.
[0002]
[Prior art]
The prior art will be described by taking a hydraulic excavator as an example.
[0003]
FIG. 6 shows an upper structure of a hydraulic excavator. An upper swing body 1 is mounted on a lower traveling body (not shown) so as to be rotatable around a vertical axis O, and an operating device (excavation attachment, here a boom) is mounted on the upper swing body 1. 2 is shown). 3 is a cabin.
[0004]
In this hydraulic excavator, a swivel joint 4 is provided at a turning center portion of the upper swing body 1, and oil and other fluids are exchanged between the lower traveling body and the upper swing body 1 by the swivel joint 4.
[0005]
Further, when an electrical facility (for example, an electric motor and its control device in an electric hydraulic excavator) is mounted on the upper swing body 1, an internal wiring connected to the electrical facility and an external wiring connected to an external power source or the like are connected. In addition, a slip ring 5 is provided coaxially with the swivel joint 4 and above the joint 4.
[0006]
As shown in FIG. 7, the slip ring 5 is attached to a cylindrical body 6 provided on a longitudinal axis O which is a turning center, and an outer periphery of the cylindrical body 6 via insulating discs 7. A plurality of conductive rings 8, a case 9 provided on the outer peripheral side of the conductive rings 8, and a brush holder 10 provided on the inner periphery of the case 9 in contact with the conductive rings 8 from the outer peripheral side. The cylindrical body 6 is attached to the lower traveling body side as a fixed part, and the case 9 is attached to the upper revolving body side as a rotating part.
[0007]
The internal wiring A on the rotating side and the external wiring B on the fixed side are electrically connected by the conductive rings 8 as the brush device and the brush 11.
[0008]
Each conductive ring 8 is provided with an input terminal 12, and each brush 11 is provided with an output terminal 13. The external wiring B is connected to the input terminal 12, and the internal wiring A is connected to the output terminal 13.
[0009]
Here, the external wiring B is passed from the bottom to the top through the hollow portion 6 a of the cylindrical body 6 that communicates with the center hole (not shown) of the swivel joint 4 of FIG. 6, and its terminal is connected to the input terminal 12.
[0010]
[Problems to be solved by the invention]
However, according to such a conventional slip ring, since the external wiring B is bent from the hollow portion 6a of the cylindrical body 6 to the outer peripheral side and connected to the input terminal 12, the external wiring B is connected to the external power source. In the case of such a large-diameter electric wire as large as 50 to 60 mm ² , connection work including bending of the electric wire becomes troublesome.
[0011]
Moreover, since the electric wire is thick and the arc of bending of the electric wire becomes large, the cylindrical body 6 must have a large diameter.
[0012]
Therefore, since the entire slip ring 5 is large, there is a problem that it becomes difficult to install in a small hydraulic excavator having a sufficient space, because interference with other structures occurs.
[0013]
For example, as shown in FIG. 6, since the slip ring 5 is close to the base end portion of the boom 2 and interferes when the boom 2 is raised, the maximum rising angle of the boom 2 is restricted, and the excavator's original working ability Will be diminished. In addition, in FIG. 6, the original boom maximum standing angle is shown with a broken line, and the restricted boom maximum standing angle is shown with a broken line.
[0014]
Therefore, the present invention provides a work machine and a work machine slip ring capable of simplifying wiring connection work and reducing the diameter of the entire slip ring.
[0015]
[Means for Solving the Problems]
The invention according to claim 1 is a slip ring used in a work machine in which an upper revolving unit is rotatably mounted on a lower traveling body and a work device is attached to the upper revolving unit. A fixed portion having a shape, a rotating portion disposed on the outer periphery of the fixed portion in a state of being rotatably coupled to the fixed portion around the vertical axis, and provided between the rotating portion and the fixed portion . A brush device , wherein the input side is attached to the rotating portion, the output side is attached to the fixed portion, the inner output terminal connected to the output side of the brush device, the outer peripheral side of the fixed portion, and the inner side output outer output terminal connected to the inner output terminal at a position of the outer peripheral side of the terminal provided on the fixed portion, while the external wiring is connected to the input side of the brush device, the internal wiring, the fixed part of Through the empty portion are those that are configured to be connected to the outer output terminal.
[0016]
According to a second aspect of the invention, in the configuration of claim 1, the rotating part input terminal block is provided on the external wiring is connected from the slip rings the outer peripheral side to the input terminal block and a plurality of this input terminal block It is configured to be divided into connection wirings and connected to the input side of the brush device.
[0017]
According to a third aspect of the present invention, in the configuration of the second aspect, an insulating plate is provided between the input terminal block and the fixed portion to electrically insulate them.
[0018]
According to a fourth aspect of the present invention, the upper revolving unit is rotatably mounted on the lower traveling unit, and a work device is attached to the upper revolving unit. The work machine slip ring is attached to the upper swing body at a position deviating from the pivot center of the upper swing body.
[0019]
According to the above configuration,
(B) The input side of the brush device is attached to the rotating part (slip ring outer peripheral side), the output side is attached to the fixed part (slip ring inner peripheral side), and a thick external wiring is connected to the slip ring outer peripheral side. Since the wiring is passed through the hollow part of the fixed part, it is not necessary to bend and connect a thick power cable, and the connection work is basically simplified, and the diameter of the entire slip ring can be reduced by reducing the fixed part. .
[0020]
The (b) Internal wiring for connecting to the outside an output terminal provided on the outer peripheral side than the inner output terminal on the outer peripheral side of the fixed part, can be connected without difficulty easily with a sufficient bend radius.
[0021]
(C) Since the bending radius can be increased, the allowable current can be increased by sufficiently increasing the diameter of the internal wiring.
[0022]
According to the configuration of claim 2, 3, in addition to the effect of claim 1, for connection to the input side of the brush device by dividing the external wiring to connect the wiring with the input terminal block, those small-diameter as a connecting wiring Can be used. For this reason, the connection work including the bending of the electric wire in the slip ring can be further facilitated, and the diameter of the slip ring to be secured for the bending of the electric wire can be reduced.
[0023]
Thereby, the diameter reduction of a slip ring and the ease of a connection operation become further remarkable.
[0024]
Further, according to the configuration of claim 3, between the fixed part and the input terminal block, since these are provided electrically insulating insulation plate, while preventing the contact of the external wiring and the internal wiring, surplus spaces The axial dimension of the slip ring can be reduced by minimizing the width of the slip ring.
[0025]
According to the fourth aspect of the present invention, the slip ring is provided on the upper swing body at a position deviating from the pivot center of the upper swing body having many space restrictions, and therefore there is a risk of interference between the slip ring and the work device (for example, a boom). More and more.
[0026]
In addition, since the slip ring can be easily installed and selected and installed at an arbitrary place convenient for wiring work and maintenance, the electrical wiring connection work becomes easier and convenient for maintenance.
[0027]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to FIGS.
[0028]
Here, a hydraulic excavator is taken as an example of application.
[0029]
As shown in FIGS. 1 and 2, the swivel joint 4 is provided at the turning center portion of the upper swing body 1, while the slip ring 21 is positioned on the upper swing body 1 at a position deviated from the swing center, specifically, the upper surface on the right side of the rear part. Is installed.
[0030]
1 and 2, the same components as those of the conventional hydraulic excavator shown in FIG. 6 are denoted by the same reference numerals, and redundant description thereof is omitted. In FIG. 2, reference numeral 22 denotes a switchboard provided on the front right side of the upper swing body 1, and the internal wiring A taken out from the slip ring 21 is connected to electrical equipment such as an electric motor (not shown) via the switchboard 22. The
[0031]
The configuration of the slip ring 21 will be described with reference to FIG.
[0032]
Reference numeral 23 denotes a cylindrical body as a fixed portion, and reference numeral 24 denotes a case as a rotating portion disposed on the outer periphery of the cylindrical body 23, and these are coupled by a bearing 25 so as to be relatively rotatable around a vertical axis. Reference numeral 23 a denotes a hollow portion of the cylindrical body 23.
[0033]
A brush device is provided on the outer periphery of the cylindrical body 23. That is, a plurality of conductive rings 27 are attached to the outer periphery of the cylindrical body 23 via discs 26 made of electrical insulators, and a brush 29 provided on the inner peripheral side of the case 24 via a brush holder 28. ... and this conductive ring 27 ... are brought into contact and electrically connected.
[0034]
The brush holders 28 are provided with input terminals 30. The external wiring B is connected to the input terminals 30 as follows.
[0035]
In the upper part of the case 24, an input terminal block 31 provided with a plurality of lead-in side and take-out side split terminals 31a, 31b,.
[0036]
The end portion of the external wiring B is clamped together with the coating by the clamper 32 and introduced into the case 24 from the outer peripheral side of the slip ring. And in the state isolate | separated into each core wire in the case 24, it connects with the drawing-in side division | segmentation terminal 31a ... of the input terminal block 31. FIG.
[0037]
Further, the take-out divided terminals 31b are connected to the input terminals 30 of the brush device via connection wires 33.
[0038]
On the other hand, the inner output terminals 34... And the outer output terminals 35 positioned on the outer peripheral side of the cylinder 23 are connected to the upper end portion of the cylinder 23 by the conductive plates 36. The internal wiring A passed through the portion 23a exits above the cylindrical body 23 and is connected to the outer output terminals 35.
[0039]
With this connection structure, the machine has a route of external wiring B-input terminal block 31-connection wiring 33-input terminal 30-brush 29-conductive ring 27-inner output terminal 34-conductive plate 36-outer output terminal 35-internal wiring A. Power or electrical signals are transferred from the outside to the inside of the machine.
[0040]
When the upper swing body 1 swings around the vertical axis O, the case 24 (brush 29) and the cylindrical body 23 (conductive ring 27) rotate around the slip ring center while the entire slip ring 21 rotates about the vertical axis O. These connection states are ensured by relative rotation.
[0041]
Further, an insulating plate 37 is provided between the input terminal block 31 and the upper end (inner and outer output terminals 34 and 35) of the cylindrical body 23 to prevent these contacts and to electrically insulate them.
[0042]
In this hydraulic excavator, since the slip ring 21 is provided at a position deviated from the turning center of the upper swing body 1, a position where the slip ring 21 does not interfere with the base end portion of the boom 2 (in this embodiment, the rear right side). The slip ring installation position can be freely selected.
[0043]
Therefore, basically, the boom 2 and the slip ring 21 do not interfere with each other.
[0044]
In addition, the diameter of the slip ring 21 can be reduced in the following points, and even a small excavator having no space can be easily installed while avoiding interference with other structures.
[0045]
(A) Since the external wiring B is introduced from the outer peripheral side of the slip ring, a particularly thick power cable is forcibly bent and connected as compared with the case where it is introduced from the center side of the slip ring 21 (hollow portion 23a of the cylindrical body 23). There is no need, and the connection work is basically simplified.
[0046]
(B) Since the external wiring B is divided into connection wirings 33... By the input terminal block 31 and connected to the input terminals 30, a small diameter connection wiring 33 can be used. For this reason, the connection work including the bending of the electric wire in the slip ring 21 can be further facilitated, and the diameter of the slip ring 21 to be ensured for the bending of the electric wire can be reduced.
[0047]
(C) Since the internal wiring A thinner than the external wiring B is passed through the hollow portion 23a of the cylindrical body 23, the cylindrical body 23 can be reduced in diameter.
[0048]
(D) Since it is sufficient to bend the thin internal wiring A at the upper end portion of the cylindrical body, it is easy to bend. In addition, since the internal wiring A is connected to the outer output terminal 35 provided on the outer peripheral side of the cylindrical body 23, the internal wiring A can be easily and easily connected with a sufficient bending radius.
[0049]
Further, since the bending radius can be increased as in (d) above, the allowable current can be increased by sufficiently increasing the diameter of the internal wiring A.
[0050]
By the way, since the internal wiring A has high power, it is necessary to take measures to prevent leakage of a small power (for example, 24V) cable or electrical equipment in the path between the slip ring 21 and the switchboard 22 shown in FIG. Become.
[0051]
As a countermeasure against this magnetic leakage, generally, a method of winding a metal mesh around an electric wire or passing an electric wire through a steel tube made of steel pipe is taken.
[0052]
However, according to the method of winding the metal mesh, the outer periphery must be further covered with rubber or the like in order to protect the coating, resulting in high cost. On the other hand, according to the method using a conduit, the diameter of the tube increases due to the need to secure a heat radiation space, and the installation becomes difficult, such as interference with other equipment and piping.
[0053]
Therefore, in this embodiment, the structure shown in FIG. 5 is adopted as a countermeasure against leakage.
[0054]
In FIG. 5, reference numeral 38 denotes a right side cover of the upper swing body 1, which is attached to the inside of the right side cover 38 within a range in which a leakage plate 39 can be installed. An internal wiring B is installed in the space S. Reference numeral 40 denotes a binding band for binding the internal wiring B.
[0055]
In this way, if the installation part of the internal wiring B has a double wall structure and the internal wiring B is passed through the inside, it is less expensive than the method of winding a metal mesh, and other than the method of using a conduit. It is difficult to cause interference with other devices, and installation is easy.
[0056]
Moreover, since the heat radiation space can be made sufficiently large, the allowable current can be increased.
[0057]
The present invention is not limited to a hydraulic excavator, and can be applied to various work machines (for example, an excavator and a crusher) configured by replacing an attachment using a hydraulic excavator as a base.
[0058]
【The invention's effect】
As described above, according to the present invention ,
(B) Since the thick external wiring is connected to the outer periphery of the slip ring and the thin internal wiring is passed through the hollow part of the fixed part, there is no need to forcibly bend the thick power cable and the connection work is basically easy. In addition, the diameter of the entire slip ring can be reduced by reducing the diameter of the fixed portion, and interference with other structures (for example, the boom of the working device) can be prevented.
[0059]
(B) Since the internal wiring is connected to the outer output terminal provided on the outer peripheral side of the fixed portion on the outer peripheral side than the inner output terminal, it can be easily and easily connected with a sufficient bending radius.
[0060]
(C) Since the bending radius can be increased, the allowable current can be increased by sufficiently increasing the diameter of the internal wiring.
[0061]
Further, according to the invention of claim 2, 3, in addition to the effect of claim 1, for connection to the input side of the brush device by dividing the external wiring to connect the wiring with the input terminal block, the small diameter of the connection wire Things can be used. For this reason, the connection work including the bending of the electric wire in the slip ring can be further facilitated, and the diameter of the slip ring to be secured for the bending of the electric wire can be reduced.
[0062]
Thereby, the diameter reduction of a slip ring and the ease of a connection operation become further remarkable.
[0063]
Further, according to the invention of claim 3, since the insulating plate is provided between the input terminal block and the fixed portion to electrically insulate them, the extra space is prevented while preventing the external wiring from contacting the internal wiring. The axial dimension of the slip ring can be reduced by minimizing the width of the slip ring.
[0064]
According to the invention of claim 4, since the slip ring is provided on the upper swing body at a position deviating from the pivot center of the upper swing body with many space constraints, there is a risk of interference between the slip ring and the work device (for example, a boom). More and more.
[0065]
In addition, since the slip ring can be easily installed and can be installed at any place convenient for wiring work and maintenance, the electrical wiring connection work becomes easier and convenient for maintenance.
[Brief description of the drawings]
FIG. 1 is a side view showing a slip ring according to an embodiment of the present invention and an upper structure of a hydraulic excavator equipped with the slip ring.
FIG. 2 is a plan view of the same.
FIG. 3 is an enlarged longitudinal sectional view of a slip ring according to an embodiment.
4 is a cross-sectional view taken along the line IV-IV in FIG. 3;
FIG. 5 is an enlarged cross-sectional view taken along line VV in FIG.
FIG. 6 is a side view showing a conventional slip ring and an upper structure of a hydraulic excavator on which the slip ring is mounted.
FIG. 7 is an enlarged longitudinal sectional view of a conventional slip ring.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Upper revolving body O The vertical axis used as a turning center 21 Slip ring 23 The cylinder which is a fixed part 23a The hollow part of a cylinder 24 The case which is a rotating part 27 The conductive ring which comprises a brush apparatus 28 The same brush holder 29 The same brush 30 Input Terminal 31 Input terminal block 33 Connection wiring 35 Outer output terminal 37 Insulating plate

Claims (4)

A slip ring used in a work machine in which an upper revolving unit is rotatably mounted on a lower traveling unit and a work device is attached to the upper revolving unit, and includes a hollow fixed portion, comprising a outer periphery disposed a rotating part of rotatably coupled state in the fixed part about a vertical axis, and a brush device provided between the rotary portion and the fixed portion relative to the fixed portion, this The brush device has an input side attached to the rotating portion and an output side attached to the fixed portion, and an inner output terminal connected to the output side of the brush device, an outer peripheral side of the fixed portion, and an outer peripheral side of the inner output terminal. position and connected to the outer output terminal inside the output terminal provided on the fixed part, while the external wiring is connected to the input side of the brush device, the internal wiring, through the hollow portion of the fixed part above Work machine slip rings, characterized in that it is adapted to be connected to the side output terminal. Input terminal block is provided on the rotating portion is connected to the input terminal block external wiring from the slip ring outer periphery, and is divided by the input terminal block into a plurality of connection wirings are connected to the input side of the brush device The slip ring for a work machine according to claim 1 , wherein the slip ring is configured as described above .   The slip ring for a work machine according to claim 2, wherein an insulating plate is provided between the input terminal block and the fixed portion to electrically insulate them.   4. A slip ring for a work machine according to claim 1, wherein an upper swing body is rotatably mounted on the lower traveling body, and a work device is attached to the upper swing body. 5. Is attached to the upper swing body at a position deviating from the pivot center of the upper swing body.

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