JP4712651B2 - Rotary connection device and working machine - Google Patents

Description

  The present invention relates to a working machine using an electric drive device such as a traveling electric motor for a traveling body, a power source and a control device on a revolving body, and an electric device such as an electric drive device and a sensor provided on the traveling body; The present invention relates to a rotary connection device that transmits electric power and a control signal between them, and a work machine equipped with this rotary connection device.

  When excavation work, transport work, etc. are carried out in a tunnel, or when, for example, an industrial waste treatment work is carried out indoors, an engine-driven work machine that is usually used, the air in the tunnel or indoors is caused by engine exhaust gas. Is contaminated. In such a work environment, a work machine using a battery or a commercial power source is used instead of the engine in order to prevent air pollution. In addition, a work machine using a power source that does not discharge exhaust gas is also awarded because it does not cause air pollution or cause global warming.

  In a working machine using such a power source, an electric motor is used as a traveling motor. Electric power is transmitted from the power source on the revolving unit to the traveling electric motor, various sensors provided on the traveling unit, and the revolving unit. In order to transmit control signals to the upper control device, a rotary connection device is provided in the swivel device. In the conventional rotary connection device, a rotary connection device for a control signal using a low-voltage (for example, 5 V) direct current and a rotary connection device for electric power that uses an alternating current of a higher voltage (for example, 220 V) than the control signal are Are arranged coaxially with each other (see, for example, Patent Document 1). In this rotary connection device, the power transmission connection device and the control signal transmission connection device have the same capacity.

Japanese Patent Laid-Open No. 11-29960

  The conventional rotary connection device requires a large space in the vertical direction because the rotary connection devices for power and control signals are arranged vertically. In order to secure this installation space, there has been a problem that it is necessary to increase the height of the working machine or to secure an extra space on the revolving structure for installing this rotary connection device.

  SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object thereof is to provide a rotary connection device having a configuration that does not require a small installation space and an increase in the height of the work implement, and a work implement using the device. And

The rotary connection device according to claim 1 is provided in the turning device in the working machine in which the turning body is installed on the traveling body having the electric drive device via the turning device, and the power supply and control mounted on the turning body. In a rotary connection device that transmits electric power and a control signal between a device and an electric drive device provided in the traveling body, electric equipment,
A control signal transmission connecting device comprising a slip ring and a brush having a smaller diameter than the slip ring is provided inside the power transmission connecting device comprising a slip ring and a brush, and the power transmission connecting device and the control signal transmitting connection device. Arrange so that each slip ring is concentric ,
Further, the cylinder of the power transmission connecting device attached to the swivel body and turning together with the swivel body and the cylinder of the control signal transmission connection device are connected by a connecting member .

  According to a second aspect of the present invention, there is provided a work machine including the rotary connection device according to the first aspect.

According to the present invention, the power transmission connection device and the control signal transmission connection device are disposed concentrically on the outer side and the inner side, so that a height higher than the height of any one of these connection devices is required. The installation space in the height direction is greatly reduced. Moreover, since this installation space is reduced, it is not necessary to increase the height of the work machine, and it is not necessary to secure a large space for the connection device on the revolving structure .

  1 and 2 are a side view and a rear view, respectively, showing an embodiment of a working machine according to the present invention. In this embodiment, the working machine is a hydraulic excavator. As shown in FIG. 1 and FIG. 2, this working machine has a swivel body 3 installed on a traveling body 1 via a swivel device 2, and a power supply device 4 a and a control device including a battery and an inverter on the swivel body 3. The building 4 containing the 4b, the cab 5, the counterweight 6, and the like are mounted. 7 is a work arm having a multi-joint structure, and 8 is a bucket attached to the tip thereof. The power supply device 4a includes, for example, a 220V AC power source for power and a 5V DC power source for control.

  The traveling body 1 includes a traveling body frame 10 including a center frame 10a and left and right side frames 10b. The side frame 10b is driven by a traveling electric motor 9 through a reduction gear 11 at one end thereof. A drive sprocket 12 is attached, a driven sprocket 13 is attached to the other end of the side frame 10b, and a crawler belt 15 is wound around these sprockets 12, 13 and rollers 14.

  A rotary connection device 16 is installed in the turning device 2 installed on the center frame 10a. The structure of the rotary connection device 16 is shown in the longitudinal sectional view of FIG. 3 and the transverse sectional view of FIG. Reference numeral 19 denotes a case of a rotary connection device in which a top plate 19a is fixed in the swivel device 2, 19b a bottom plate thereof, 20 a power transmission connection device housed in the case 19, and 21 a control signal transmission connection device. It is. The control signal transmission connection device 21 is installed inside the power transmission connection device 20 and is concentric with the slip ring 27 of the power transmission connection device 20 (see FIG. 5). Is installed.

  Reference numeral 22 denotes a cylindrical body which is attached to the revolving body 3 of the revolving device 2 and revolves together with the revolving body 3, and this cylindrical body 22 is inserted into the central opening of the top plate 19a. Reference numeral 23 denotes a case lid attached to the cylindrical body 22, and the lid 23 is coupled to the top plate 19 a of the case 19 via a bearing 25 so as to be rotatable.

26 is a circular slip ring mounting plate fixed to the lower part of the cylindrical body 22 , 27 is a plurality of slip rings constituting the power transmission connecting device 20, and the slip ring 27 is connected to the adjacent slip ring 27. Insulating spacers 30 are interposed between the slip ring mounting plate 26 and the ring 31, and are sandwiched between a plurality of (6 in the illustrated example) screw rods 32 and their upper and lower ends. The nut 33 is fixed to the slip ring mounting plate 26. 34 is a power cable connected to each of the slip rings 27, one end of the power cable 34 is connected to the power supply device 4a mounted on the swivel body 3, the other end is passed through the cylindrical body 22, and It is connected to a corresponding slip ring 27 through an opening 22 a provided on the side surface of the cylindrical body 22.

  Reference numeral 35 denotes a brush that contacts the outer periphery of the slip ring 27, and 36 denotes a plurality of screw rods (four in the illustrated example) provided to attach the brush holder 40. The screw rod 36 is threaded into a screw hole provided in the inner ring 25a of the bearing 25 through a hole provided in the top plate 19a through an upper end screw part and fastened by a nut 37, and the lower end screw part is fixed to a lower ring. 38 is inserted into the hole 38 and screwed into the nut 39 to be fastened. The brush holder 40 is rotatably attached to the screw rod 36 as a pair, and the brush 35 is held by each brush holder 40. Each brush holder 40 is urged in the direction of arrow R by a spring (not shown) in FIG. 4 to press the brush 35 against the outer peripheral surface of the slip ring 27.

  Reference numeral 41 denotes a connector provided in the case 19, and 42 denotes a power cable for connecting the brush 35 to the corresponding connector 41. Each connector 41 is connected to the traveling electric motor 9 via a power cable (not shown). In this embodiment, since a three-phase motor is used as the electric motor 9 provided in the traveling body 1, the connector 41 is required because three electric cables are required for each of the left and right traveling electric motors 9. 6 are provided. When another electric drive device such as another electric motor or electric cylinder is provided in the traveling body 1, the number of slip rings 27, connectors 41, etc. corresponding to the added electric drive device are provided.

  Next, the control signal transmission connecting device 21 will be described with reference to FIGS. Reference numeral 43 denotes a cylindrical body coupled to the lower part of the cylindrical body 22 by a connecting member 44 such as a rod, and 45 denotes a slip ring that is insulated and stacked. Reference numeral 46 denotes a bolt for attaching the slip ring 45 to the large-diameter portion 43a at the lower part of the cylindrical body 43. The bolt 46 is inserted through a hole in the lower ring 47, and is inserted into a hole provided in the slip ring 45. The slip ring 45 is fixed to the cylindrical body 43 by screwing and screwing the upper threaded portion into the screw hole of the large diameter portion 43 a of the cylindrical body 43.

  Reference numeral 50 denotes a signal line connected to the slip ring 45. One end of the signal line 50 is connected to the control device 4b mounted on the swing body 3, and the other end is an opening provided in the cylinder 43. It passes through the portion 43b and is connected to the corresponding slip ring 45.

  49 is a cylindrical body that forms the case of the control signal transmission connecting device 21 together with the top plate 54 and the bottom plate 55, 51 is a brush that contacts the outer periphery of the slip ring 45, 52 is a brush holder, and 53 is for attaching the brush holder 52. Are a plurality of bolts. The top plate 54 is fitted so that the central cylindrical portion 54a of the top plate 54 can turn relatively to the large diameter portion 43a of the cylindrical body 43. The bolt 53 is passed through a hole provided in the top plate 54 from above, and is inserted into a hole provided in the brush holder 52 so that the brush holder 52 can rotate, and is passed through a hole in the bottom plate 55 by a nut 56. The bottom plate 19b is inserted into a hole provided in the bottom plate 19b, and the bottom plate 19b is clamped by upper and lower nuts 57, 58 that are screwed into the screw portion. By adjusting, the position of the brush 51 in the height direction can be adjusted. Each brush holder 52 presses the brush 51 against the outer peripheral surface of the slip ring 45 by a spring (not shown) as in the power transmission connecting device 20 described above. Reference numeral 59 denotes a signal line that connects the brush 51 to an electrical device on the traveling body 1.

  The electric devices on the traveling body 1 to which the control signal is transmitted by the control signal transmission connecting device 21 are provided, for example, inside and outside the rotation speed sensor and the temperature sensor of the electric motor 9 and the bearing portion of the electric motor 9. A temperature sensor, a brake control device, a brake application confirmation sensor, and the like. The temperature sensor is provided to protect the electric motor 9 by stopping the electric motor 9 when the detected temperature exceeds the reference level. If other electrical devices such as sensors are added, the number of slip rings 45 and the number of signal lines 50 and 59 are also added according to the number.

  Thus, in the present embodiment, the power transmission connection device 20 and the control signal transmission connection device 21 are arranged concentrically on the outer side and the inner side so that the slip rings 27 and 45 are concentric. Therefore, the height higher than the height of any one of these connection devices (the power transmission connection device 20 in the present embodiment) is not required, and the installation space in the height direction is higher than that of the conventional rotary connection device. Is greatly reduced. Moreover, since this installation space is reduced, it is not necessary to increase the height of the work implement, and it is not necessary to secure a large space for this connection device on the revolving structure 3.

  In the present invention, if the traveling machine 1 is provided with an electric drive device and has a swivel body 3, in addition to various construction machines other than a hydraulic excavator, agriculture, forestry, horticulture, industrial waste processing, etc. It can be applied to work machines in various industries. The signal transmitted by the control signal transmission connecting device 21 via the signal lines 50 and 59 includes a drive device that requires a relatively low current as shown in the brake control and the like. Good. Moreover, the power supply device 4a mounted on the revolving structure 3 is not a battery-mounted type, but may be one using a commercial power source or a combination of a battery and a commercial power source.

It is a side view which shows one Embodiment of the working machine by this invention. It is a rear view which abbreviate | omits the work front of the working machine of FIG. It is a longitudinal cross-sectional view of the rotary connection apparatus of this Embodiment. It is a cross-sectional view of the rotary connection device of the present embodiment. It is a longitudinal cross-sectional view of the control signal transmission connection device of the present embodiment.

Explanation of symbols

1: traveling body, 2: turning device, 3: turning body, 4a: power supply device, 4b: control device, 5: cab, 6: counterweight, 7: working arm, 8: bucket, 9: electric motor for traveling Motor: 10: traveling body frame, 10a: center frame, 10b: side frame, 11: reduction gear, 12: drive sprocket, 13: driven sprocket, 14: roller, 15: crawler belt, 16: rotary connection device, 19: Case: 19a: Top plate, 19b: Bottom plate, 20: Connection device for power transmission, 21: Connection device for transmission of control signal, 22: Cylindrical body, 23: Cover body, 25: Bearing, 26: Slip ring mounting plate, 27 : Slip ring, 30: spacer, 31: ring, 32: screw rod, 33: nut, 34: power cable, 35: brush, 36: screw rod, 37: nut, 38: lower phosphorus , 39: nut, 40: brush holder, 41: connector, 42: power cable, 43: cylinder, 45: slip ring, 46: bolt, 47: lower ring, 49: case, 50: signal line, 52: brush Holder, 53: Bolt, 54: Top plate, 55: Bottom plate, 56-58: Nut, 59: Signal line

Claims (2)

A power source and a control device mounted on the swivel body and an electric type provided in the travel body are provided in the swivel device in a work machine in which the swivel body is installed via a swivel device on a travel body having an electric drive device. In a rotary connection device that transmits electric power and control signals to and from a drive device and an electric device,
A control signal transmission connecting device comprising a slip ring and a brush having a smaller diameter than the slip ring is provided inside the power transmission connecting device comprising a slip ring and a brush, and the power transmission connecting device and the control signal transmitting connection device. Arrange so that each slip ring is concentric ,
Further , the rotary connecting device is characterized in that a connecting member for connecting the cylinder of the power transmission connecting device attached to the rotating body and turning together with the rotating body is connected by a connecting member. .   A working machine comprising the rotary connection device according to claim 1.

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