JPH1129960A - Swivel joint device and its signal transmitting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a swivel joint device which is so simple in structure and short in overall length that its assembling property can be enhanced and its cost reduced and to provided its signal transmitting method. SOLUTION: This device has a first electric swivel joint 20a which has first and second electric rotors being coaxial with the center of revolution and rotatably fitted over the outer periphery of a shaft 11 and locked to an adjacent base 1 or one of revolving structures 2, 3, and which is capable of relative rotation when a slip ring attached to the rotors is put into contact with a brush 2. The device may be provided with one or more hydraulic/pneumatic swivel joints 10a each having a hydraulic/ pneumatic port 18b provided on the outer periphery of the shaft 11, an annular groove 19g, a line 18 communicating the hydraulic/pneumatic port 18b with the annular groove 19g, a first hydraulic/pneumatic rotor 12a rotatably fitted over the outer periphery of the shaft 11 and locked to the base 1 or revolving structures 2, 3, a second hydraulic/pneumatic port 19c on the outer periphery of the first hydraulic/pneumatic rotor 12a, an annular groove 19d in the inner peripheral surface of the first hydraulic/ pneumatic rotor 12a, and a first hydraulic/pneumatic circuit 19a which communicates the first hydraulic/pneumatic port 19c with the annular groove 19d.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an industrial vehicle having a plurality of revolving bodies having the same turning center on a base body and capable of turning independently of each other. The present invention relates to a swivel joint for rotatably connecting signals of an electric system and a hydraulic / pneumatic system, that is, a rotary joint.

[0002]

2. Description of the Related Art Conventionally, in an industrial vehicle or a construction machine (hereinafter collectively referred to as an industrial vehicle) having a revolving revolving structure on a substrate such as a lower traveling unit having driving wheels, the revolving base and the revolving body have been known. 2. Description of the Related Art A swivel joint device for connecting an electric system signal and a hydraulic / pneumatic system signal to a body so as to be freely rotatable is widely used.

As this swivel joint device, for example, one disclosed in Japanese Patent Application Laid-Open No. 4-366233 is known, and FIG. 5 shows an example of a swivel joint device similar to that disclosed in the same publication. I have. In the same figure, a cylindrical hydraulic pressure
An upper end of the pneumatic rotor 12 is suspended from the base 1, and a shaft 11 is rotatably inserted into the hydraulic / pneumatic rotor 12 from above, and is fixed to an upper portion of the shaft 11. Bracket 16 is locked to the swing body 7. The center of rotation of the hydraulic / pneumatic rotor 12 coincides with the axis of the shaft 11. The upper end face of the hydraulic / pneumatic rotor 12 is in contact with the stepped end face 11 a of the enlarged diameter portion formed on the upper part of the shaft 11. Shaft 1
1 has a plurality of conduits 18 in the axial direction of the shaft 11.
The hydraulic / pneumatic rotor 12 is provided with a plurality of hydraulic / pneumatic circuits 19 communicating with the plurality of pipelines 18 along the rotation center direction. The pipeline 18 and the hydraulic / pneumatic circuit 19
A hydraulic / pneumatic swivel joint 10 that connects the pneumatic signals so as to be pivotable is configured.

At the upper end of the shaft 11, an electric swivel joint 20 is provided with a body 52 and an electric shaft 5
Attached via 3. Hydraulic / pneumatic rotor 12
A cover 60 is fixed to the lower end surface of the cover 60, and a pipe 61 is fixed to the center of the cover 60.
1 rotatably penetrates a through hole 56 provided at the center of the shaft 11. A hollow body 52 is attached to the upper end surface of the shaft 11, and an electric shaft 53 fixed to a pipe 61 is rotatably disposed at the center of the body 52 via bearings 54 and 55. ing. The brush 27 and the electric shaft 53 attached to the body 52
The brush 27 is rotatable relative to the slip ring 26 while constantly in contact with the slip ring 26. The electric wire 36 connected to the brush 27 and the slip ring 2
The electric signal between the revolving unit 7 and the base 1 is connected by the electric wire 37 connected to 6.

[0005] With the above-described configuration, when the revolving structure 7 rotates with respect to the base 1, the shaft 11 and the hydraulic / pneumatic rotor 12 simultaneously rotate relative to each other, and the hydraulic / pneumatic space between the base 1 and the revolving structure 7. The pressure signal is transmitted via the pipeline 18 of the shaft 11 and the hydraulic / pneumatic circuit 19 of the hydraulic / pneumatic rotor 12 even during the relative rotation. At the same time, the electric shaft 53
And the body 52 rotate relative to each other so that the slip ring 26
And the brush 27 rotate relative to each other, so that an electric signal between the base 1 and the rotating body 7 is transmitted through the slip ring 26 and the brush 27 even during the relative rotation. As described above, the hydraulic / pneumatic / electric swivel joint according to the related art has a structure in which the hydraulic / pneumatic system transmission unit and the electric system transmission unit are separated into upper and lower two phases.

[0006]

On the other hand, in recent years, due to diversification of use conditions, two or more revolving bodies having the same revolving center and revolving independently of each other on a base such as a lower traveling body. There is a demand for an industrial vehicle including a multiple revolving superstructure provided with.

However, the conventional swivel joint device as described above is applied to an industrial vehicle equipped with such a multiple revolving structure to transmit a hydraulic / pneumatic system or an electric system between each revolving structure and the base 1. Then, it is necessary to provide a swivel joint device for each revolving structure, and a plurality of swivel joint devices must be installed on a coaxial line. Therefore, the overall height of the stacked swivel joint device is increased, and as a result, the floor of the revolving body to which the swivel joint device is mounted (for example, the floor in front of the driver's seat) or the like protrudes upward. Problems such as deterioration of the appearance or an increase in the total height of the vehicle and no longer satisfying the vehicle height restriction condition for vehicle transportation occur.

Further, since the swivel joint devices are stacked, there is a problem that the piping assembly structure is complicated and the assemblability is poor. Further, in the case of a multiple revolving superstructure, the connection of the electric system and the hydraulic and pneumatic system signals between the separated base body and the revolving superstructure has to go through all the swivel joint devices existing between them, so that it goes through. An extra hydraulic / pneumatic circuit 19 is required for this, and the number of ports (the number of hydraulic / pneumatic circuits 19) of the individual swivel joint devices increases, and the length and the outer diameter increase. Therefore, each hydraulic / pneumatic rotor 12 and shaft 1
1 becomes even higher. As a result, the distance between the base and each revolving structure is increased, and the overall height of the vehicle is increased.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has a simple structure, a short overall length, an improved assemblability and a reduced cost, and a signal transmission therefor. It is intended to provide a way.

[0010]

SUMMARY OF THE INVENTION In order to achieve the above object, an invention according to claim 1 has a double or more double rotations having the same rotation center and rotating independently of each other. In a swivel joint device in which a revolving body is rotatably provided above a base body (1) and a signal of an electric system is rotatably connected between the base body (1) and the revolving body or between the revolving bodies. A shaft (11) having the same axis as the center, and attached to one of the base (1) and the plurality of revolving units, and a shaft attached to an outer peripheral portion of the shaft (11). It is rotatable about the axis of (11) as the center of rotation, and is inserted in an overlapping manner in the direction of the center of rotation, and is inserted between the adjacent base (1) and the revolving unit or two adjacent revolving bodies. A first electric rotor (21) locked to one between the bodies
And a second electric rotor (22) locked to the other, and an annular slip ring (2) attached to the first electric rotor (21).
6) and at least one pair of electric swivel joints 20a and 20b provided with a brush (27) attached to the second electric rotor (22) so as to be relatively rotatable and always in contact with each other. And According to the first aspect of the present invention, an electric signal for transmitting an electric signal between an adjacent base and a revolving structure or between two adjacent revolving structures to an outer peripheral portion of one shaft having the same axis as the center of rotation. The swivel joint is fitted closely. Thereby, the connection of the electric signal between the base body and each of the two or more revolving superstructures becomes possible by one swivel joint device, and the overall height of the swivel joint device can be reduced as a whole. Therefore, it is possible to reduce the distance between each of the revolving structures, and to reduce the overall height of an industrial vehicle (for example, a hydraulic excavator, etc.) having multiple revolving structures. Not receive. Further, the position of the center of gravity of the vehicle is lowered to improve the stability, and the weight can be reduced by reducing the number of parts. Furthermore, unlike the conventional case, there is no need to combine a plurality of swivel joint devices, and the electric swivel joint is simply inserted into a single shaft at a required position, so that the swivel joint device can be easily and integrally assembled. , Maintenance and cost are improved.

According to a second aspect of the present invention, a double or more revolving structure having the same center of revolving and revolving independently of each other is provided on the upper portion of the base (1) so as to be revolvable.
In the swivel joint device that connects the signals of the electric system and the hydraulic / pneumatic system between (1) and the revolving structure, or between the revolving structures, the swivel joint device has the same axis as the revolving center, and A shaft (11) attached to any one of the base body (1) and the plurality of revolving units, and one or more shafts provided along an axial direction on an outer peripheral portion of the shaft (11); A hydraulic / pneumatic port 18b, one or more annular grooves 19g, 19h provided on the outer periphery of the shaft (11) above and / or below the hydraulic / pneumatic port 18b in the axial direction; (11), each annular groove 19 of the shaft (11).
g, 19h and one or more conduits 18 for communicating the respective hydraulic / pneumatic ports (18b) with each other, and the outer periphery of the shaft (11) provided with the annular grooves 19g, 19h so as to be rotatable. , The cylindrical hydraulic and pneumatic rotors 12a, 12 locked to the base body (1) to which the shaft (11) is not attached or the rotating body.
b, and one or more hydraulic / pneumatic ports 19c, 19e provided on the outer periphery of the hydraulic / pneumatic rotors 12a, 12b.
And one or more annular grooves 19d, 19f provided on the inner peripheral surfaces of the hydraulic / pneumatic rotors 12a, 12b, facing the predetermined annular grooves 19g, 19h of the shaft (11).
The hydraulic / pneumatic ports 19 of the hydraulic / pneumatic rotors 12a, 12b are provided inside the pneumatic rotors 12a, 12b.
c, 19e and at least one hydraulic / pneumatic swivel joint 10a, 10b comprising one or more hydraulic / pneumatic circuits 19a, 19b for communicating the annular grooves 19d, 19f, respectively, with the shaft (11). ) Is rotatably mounted on the outer peripheral portion, and sequentially inserted in the axial direction of the rotating shaft so as to overlap with each other, and is adjacent to the base (1) or the shaft (11).
And either the revolving superstructure or the hydraulic / pneumatic rotors 12a, 12b, or between the adjacent revolving superstructure or the hydraulic / pneumatic rotors 12a, 12b. A first electric rotor (21) having a first electric rotor (21) and a second electric rotor (22) locked to the other end;
An annular slip ring (26) attached to the second electric rotor (22) and a brush (27) attached to the second electric rotor (22) are relatively rotatable,
In addition, at least one pair of electric swivel joints 20a and 20b provided so as to be in constant contact with each other is provided. According to the second aspect of the present invention, the hydraulic / pneumatic signal and the hydraulic / pneumatic signal between the adjacent base and the revolving body or between the two adjacent revolving bodies are provided on the outer peripheral portion of one shaft having the same axis as the revolving center. A hydraulic / pneumatic rotor for transmitting an electric signal and an electric swivel joint are closely fitted. This enables connection of hydraulic / pneumatic signals and electric signals between the base and each of the two or more revolving superstructures by one swivel joint device. Furthermore, as described later,
Since the piping between the pneumatic swivel joints is reduced, an extra hydraulic / pneumatic port for this is not required, and the overall length of the shaft can be further reduced. Therefore, the overall height of the swivel joint device can be reduced as a whole. Therefore, it is possible to reduce the distance between each of the revolving structures, and to reduce the overall height of an industrial vehicle (for example, a hydraulic excavator or the like) having multiple revolving structures. Be able to comply. Further, the position of the center of gravity of the vehicle is lowered to improve the stability, and the weight can be reduced by reducing the number of parts. Furthermore, there is no need to combine a plurality of swivel joint devices as in the conventional case, and only the hydraulic / pneumatic rotor and the electric swivel joint are inserted into a single shaft at the required positions. It can be assembled. Also, the piping between the hydraulic and pneumatic swivel joints is reduced. That is, piping from a revolving superstructure (usually the uppermost revolving superstructure) on which drive sources and control devices for hydraulic equipment and electric equipment are mounted to other revolving superstructures and a base (lowermost body such as a lower traveling structure) Can be performed directly between the shaft and each hydraulic / pneumatic rotor. Therefore, assemblability, maintainability, and cost can be improved.

[0012] The invention according to claim 3 is the invention according to claim 1 or 2.
In the swivel joint device described above, a plurality of pairs of the slip rings 26 and the brushes 27 of the electric swivel joints 20a and 20b are stacked in the direction of the center of rotation and arranged in the same cylindrical surface. According to the third aspect of the present invention, a pair of slip rings and brushes corresponding to a required number of signal lines are laminated in the same cylindrical shape, so that a compact electric swivel having the same diameter and a small diameter. A joint is obtained. Therefore, it is possible to reduce the size and to make components of the slip ring and the brush common.

According to a fourth aspect of the present invention, in the swivel joint device according to the first, second or third aspect, the first electric rotor 21 and the second electric rotor 22 of the same electric swivel joints 20a and 20b are connected. The friction reducing means 25 is provided on the contact surface in the axial direction. According to the fourth aspect of the invention, the frictional resistance of the contact surface between the first electric rotor and the second electric rotor that rotate relative to each other is reduced, so that wear is prevented and durability can be improved. Further, the loss of the turning drive energy converted into frictional heat is reduced, so that the drive efficiency can be improved and the life of the swivel joint device can be improved by reducing the heat loss.

[0014] The invention according to claim 5 is the invention according to claims 1, 2,
5. The swivel joint device according to 3 or 4, wherein the first electric rotor 21 and the second electric rotor 22 of the electric swivel joints 20 a and 20 b are positioned with respect to the adjacent base body 1 or revolving structure, and are locked in the rotational direction. Engagement positioning means 23a, 23b, and 40 are provided. According to the invention described in claim 5, at the time of assembling, the first electric rotor and the second electric rotor are adjacent to each other by an engagement positioning means such as a pin, a spigot hole and an annular projection, and a projection and a fitting groove. For the revolving superstructure, for each revolving superstructure, or when the hydraulic and pneumatic rotors attached to these base bodies and the revolving superstructure are mounted, Thus, the positioning and the locking in the rotation direction are easily performed. Therefore, the positioning and the engagement are performed only by sequentially overlapping the electric rotor and the hydraulic / pneumatic rotor, thereby facilitating the assembly.

[0015] The invention according to claim 6 is the invention according to claims 1, 2,
The swivel-Joyt device according to 3, 4, or 5,
A plurality of the electric swivel joints 20a and 20b are provided on an outer peripheral portion of the shaft 11. According to the invention as set forth in claim 6, the number of electric swivel joints corresponding to the number of the revolving units is provided for a multiple revolving unit having two or more revolving units, so that the signal of the electric system is transmitted to the base 1.
And the revolving structure, and between the revolving structures. Therefore, electric signals can be transmitted between the base body and the plurality of revolving units by the compact and low-height electric swivel joint.

According to a seventh aspect of the present invention, in the swivel joint device according to the sixth aspect, one of the two adjacent electric swivel joints 20a and 20b locked to the same revolving unit is used. The slip ring 26 on the side of the joint that is locked to this
The signal lines connected to the brushes 27 of the other electric swivel joint which are locked to the revolving structure are connected to each other to connect the upper and lower bases 1 of the revolving structure with the revolving structure or the upper and lower revolving structures. It is wired to transmit signals between two revolving superstructures. According to the invention as set forth in claim 7, between two of the separated base body and the plurality of revolving units having one or more revolving units interposed therebetween, an electric signal is transmitted via an intermediate electric swivel joint. Can communicate. For example, it is possible to connect an electric signal between the lowermost base and the uppermost upper revolving structure via an intermediate electric swivel joint. Therefore, transmission of an electric signal is facilitated in an industrial vehicle or the like having a multiple revolving structure.

According to an eighth aspect of the present invention, in the swivel joint device according to any one of the first to seventh aspects, the swivel joint device is attached to an electric shaft 53 attached to an upper end or a lower end of the shaft 11. With shaft 1
An annular slip ring 26 from which wiring is taken out through a through hole 56 provided in the axial direction inside 1.
Attached to the body 52 rotatably provided on the outer peripheral portion of the electric shaft 53 and locked to the base 1 or another base 1 different from the base 1 to which the shaft 11 is attached or another base. In addition, a mounting type electric swivel joint 20C having at least one pair of brushes 27 which are in constant contact with the slip ring 26 is rotatable relative to each other. According to the invention as set forth in claim 8, in the transmission of an electric signal in a multiple revolving superstructure having two or more revolving superstructures, direct transmission between the base body and the uppermost revolving superstructure by the mounted electric swivel joint is enabled. Between the adjacent base and the revolving structure by an electric swivel joint inserted into the shaft,
Alternatively, transmission can be performed between the respective revolving bodies. As a result, usually, the uppermost revolving superstructure on which the driving source and the control device are mounted,
An electric signal can be directly transmitted to and from a base on which a traveling device or the like is mounted, and noise and poor contact at the time of relaying can be eliminated, thereby improving control reliability.

According to a ninth aspect of the present invention, a double or more revolving structure having the same revolving center and revolving independently of each other is provided rotatably on the upper portion of the base (1).
(1) In a signal transmission method of a swivel joint device for transmitting a signal of an electric system between a revolving structure or between revolving structures in a swivelable manner, one or more other revolving structures intervene in a separated manner. Among a plurality of electric swivel joints for transmitting electric signals between the base 1 and the revolving structure or between the two revolving structures separated from each other, signal lines between two adjacent electric swivel joints are sequentially connected. Then, the electric signal is transmitted in a freely rotatable manner. Claim 9
According to the invention described in (1), an electric signal can be transmitted via an intermediate electric swivel joint between two of the separated base body and the plurality of revolving bodies in which one or more revolving bodies are interposed therebetween. . That is, by sequentially connecting the signal lines on the same revolving structure side of the two intermediate electric swivel joints adjacent to each other, it becomes possible to connect the separated base and the revolving structure or the signal lines between the revolving structures. . Therefore,
In an industrial vehicle or the like having a multiple turning mechanism, transmission of an electric signal is facilitated.

According to a tenth aspect of the present invention, a central revolving body (2) having the same pivot center and revolving independently of each other.
And a revolving superstructure (3) are sequentially provided on the upper part of the base (1) so as to be freely rotatable, and a signal of an electric system between the base (1), the central revolving superstructure (2), and the upper revolving superstructure (3) is provided. In a signal transmission method of a swivel joint device for transmitting a swing freely
The electrical signal between (1) and the superstructure (3) is
(1) or a signal wire wired through a through hole (56) in the shaft (11) of the electric swivel joint (20c) locked to the upper rotating body (3), and a central rotating body
(2) an electric swivel joint (20b) disposed between the middle revolving unit (2) and the upper revolving unit (3), and the electric swivel joint (20c). ) Is used to enable transmission from the central revolving superstructure (2) to the base (1) via the upper revolving superstructure (3). According to the tenth aspect of the present invention, for example, in a multiple revolving structure having a double revolving structure of a base, a middle revolving structure, and an upper revolving structure, transmission of an electric signal between the base and the upper revolving structure is performed inside the shaft. And a second electric swivel joint 20b for transmitting signals between the center revolving superstructure and the upper revolving superstructure using the signal line of the mounted electric swivel joint 20c wired through the through hole. By passing through the swivel joint 20c, transmission of an electric signal between the center swing body and the base is also possible. With such an arrangement, it is possible to directly connect an electric signal between the uppermost revolving superstructure and the base, which is often equipped with a drive source of an electric device, etc. Control signals and the like can be transmitted reliably.

[0020]

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

FIG. 1 is a side sectional view showing a first embodiment of the swivel joint device. In the present embodiment, the industrial vehicle has, for example, a center part having the same turning center and being freely turnable independently of each other on an upper part of a base body 1 made of, for example, a freely movable lower traveling body (not shown). A revolving superstructure 2 and an upper revolving superstructure 3 are provided.
However, an example in which the upper swing body 3 is mounted on the upper part of the middle swing body 2 is described.

The swivel joint device 5 is an electric, hydraulic and pneumatic swivel joint device for a multiple turning mechanism, and comprises a cylindrical first hydraulic and pneumatic rotor 12a provided coaxially with the turning center, and 1 hydraulic / pneumatic rotor 12
and a shaft 11 which is inserted from above into the inside of a and has the same axis as the above-mentioned turning center. The first hydraulic / pneumatic rotor 12a and the shaft 11
It is relatively rotatable around one axis as a center of rotation.
Further, the first hydraulic / pneumatic rotor 12a is attached to the center swing body 2 by bolts 4 via a flange 12c fixed to the outer peripheral portion. A predetermined number of first hydraulic / pneumatic ports 19c are arranged at predetermined intervals along the rotation center direction on an outer peripheral portion of the first hydraulic / pneumatic rotor 12a. Then, each first hydraulic / pneumatic port 19c is
A predetermined number of annular grooves 19d formed on the inner peripheral surface of the first hydraulic / pneumatic rotor 12a communicate with each other via respective first hydraulic / pneumatic circuits 19a provided in the radial direction corresponding to the respective annular grooves 19d. I have. The first hydraulic / pneumatic ports 19c need not be arranged linearly along the rotation center direction, but may be arranged at positions shifted from each other by a predetermined angle in the rotational direction.

The upper portion of the shaft 11 has a larger diameter portion than the lower portion inserted into the first hydraulic / pneumatic rotor 12a. A plurality of conduits 18 are provided in the shaft 11 in the axial direction. A predetermined number of the pipelines 18 of the plurality of pipelines 18 are provided on the outer peripheral surface of the enlarged diameter portion of the shaft 11 at a predetermined interval along the axial direction of the shaft 11. A predetermined number of the pressure ports 18b communicate with respective annular grooves 19g provided on the outer peripheral surface of the shaft 11 so as to face the respective annular grooves 19d. The radial hydraulic circuit that communicates the predetermined number of pipelines 18 with the respective annular grooves 19g of the shaft 11 does not need to be disposed linearly along the axial direction of the shaft 11, for example, They may be arranged at positions shifted from each other by a predetermined angle in the rotation direction. A bracket 16 is fixedly provided on the outer peripheral surface of the enlarged diameter portion of the shaft 11.
The shaft 11 is locked to the upper swing body 3 via the bracket 16. Thus, the hydraulic / pneumatic signal between the shaft 11 and the first hydraulic / pneumatic rotor 12a is rotatably connected to form the first hydraulic / pneumatic swivel joint 10a.

Further, between the stepped end surface 11a provided below the enlarged diameter portion of the shaft 11 and the upper end surface of the first hydraulic / pneumatic rotor 12a, and on the outer peripheral portion of the shaft 11, An electric swivel joint 20a is interposed. Further, a second electric swivel joint 20 is provided on the outer peripheral portion of the shaft 11 and below the first hydraulic / pneumatic rotor 12a.
The second hydraulic and pneumatic rotor 12b is fitted below the second electric swivel joint 20b. A bracket 17 is fixed to the outer peripheral surface of the second hydraulic / pneumatic rotor 12b, and the second hydraulic / pneumatic rotor 12b is connected to the base 1 via the bracket 17.
It is locked to.

A predetermined number of third hydraulic / pneumatic ports 19e are arranged at predetermined intervals along the rotation center direction on the outer peripheral portion of the second hydraulic / pneumatic rotor 12b. And each third
The hydraulic / pneumatic port 19e is connected to the second hydraulic / pneumatic rotor 12
b communicates with a predetermined number of annular grooves 19f formed on the inner peripheral surface thereof via respective second hydraulic / pneumatic circuits 19b provided in the radial direction corresponding to the respective annular grooves 19f. The first hydraulic pressure
Like the pneumatic port 19c, each third hydraulic / pneumatic port 1
9e does not need to be arranged linearly along the rotation center direction, and may be arranged at a position shifted from each other by a predetermined angle in the rotation direction. A predetermined number of the plurality of conduits 18 provided inside the shaft 11 is determined by the plurality of second hydraulic / pneumatic ports 18 b of the enlarged diameter portion of the shaft 11.
A predetermined number of ports communicate with respective annular grooves 19h provided at predetermined intervals on the outer peripheral surface of the shaft 11 so as to face the respective annular grooves 19f. The radial hydraulic circuit that communicates the predetermined number of pipelines 18 with the respective annular grooves 19h of the shaft 11 does not need to be disposed linearly along the axial direction of the shaft 11, for example, They may be arranged at positions shifted from each other by a predetermined angle in the rotation direction. Thus, the hydraulic / pneumatic signal between the shaft 11 and the second hydraulic / pneumatic rotor 12b is rotatably connected to form the second hydraulic / pneumatic swivel joint 10b.

A holder 13 is fastened to a lower end surface of the shaft 11 by a bolt 14, and this holder 13
The electric swivel joint 20b and the second hydraulic / pneumatic rotor 12b are held on the outer periphery of the shaft 11 to prevent the shaft 11 from coming off. When the holder 13 and the second hydraulic / pneumatic rotor 12b rotate relative to each other, frictional resistance is generated between them by the weight of the second electric swivel joint 20b and the second hydraulic / pneumatic rotor 12b. In order to reduce the frictional resistance, a friction reducing means 15 including a pair of spacers made of an oil-impregnated metal is interposed between the holder 13 and the second hydraulic / pneumatic rotor 12b. Note that the friction reducing means 15 is not limited to this, and may be constituted by, for example, a bearing.

Further, the swivel joint device 5 is provided with the first
Hydraulic / pneumatic rotor 12a and second hydraulic / pneumatic rotor 12
b and the two electric swivel joints 20a and 20b are arranged in series, so that the total length is long. For this reason, the amount of swing of both ends in the vertical direction at the time of turning increases, and early damage due to uneven wear of the device and mutual interference of hydraulic piping and the like may occur. To prevent this, the flange 12
c is positioned near the center of the swivel joint device 5 in the vertical direction to reduce the amount of swing of the upper and lower ends of the swivel joint device 5 during turning.

First or second electric swivel joint 20
Both a and 20b have the same configuration, and the electric swivel joint 20 will be described in detail with reference to FIG.
This figure shows a detailed sectional view of the second electric swivel joint 20b. A first electric rotor 21 is rotatably provided coaxially with the rotation center of the first hydraulic / pneumatic rotor 12a at the lower end of the first hydraulic / pneumatic rotor 12a and on the outer peripheral part of the shaft 11. The first electric rotor 21 is
3a, it is positioned on the lower end surface of the first hydraulic / pneumatic rotor 12a and is locked in the rotation direction. Thus, when the first hydraulic / pneumatic rotor 12a rotates, the first electric rotor 21 also rotates integrally. At the upper end of the second hydraulic / pneumatic rotor 12b and at the outer periphery of the shaft 11, a second electric rotor 22 is provided adjacent to the first electric rotor 21 so as to be rotatable coaxially with the rotation center. The second electric rotor 22 is positioned on the upper end surface of the second hydraulic / pneumatic rotor 12b by a pin 23b and is locked in the rotation direction. Thus, when the second hydraulic / pneumatic rotor 12b rotates, the second electric rotor 22 also rotates integrally.

As described above, the pins 23a and 23b connect the first electric rotor 21 and the second electric rotor 22 to the first hydraulic / pneumatic rotor 12a and the second hydraulic / pneumatic rotor 12b, respectively (or In the first electric swivel joint 20a, the first electric swivel joint 20a serves as an engagement positioning means for easily positioning and locking the base 1. That is, during assembly, the pins 23a and 23b are engaged between the first hydraulic / pneumatic rotor 12a and the first electric rotor 21 and between the second hydraulic / pneumatic rotor 12b and the second electric rotor 22, respectively. Since the positioning and locking are performed only by itself, the assembly is extremely easy.

The first electric rotor 21 and the second electric rotor 22
A bearing 24 is interposed between the surfaces facing in the radial direction with respect to the shaft, and friction reducing means 25, 25 comprising a pair of spacers made of, for example, an oil-impregnated metal are provided between the surfaces facing in the rotation center direction. Is interposed. By these, the first
The electric rotor 21 and the second electric rotor 22 are relatively rotatable relative to each other, and the frictional resistance is reduced, so that the wear life is improved.

A predetermined number of annular slip rings 26 are stacked on the first electric rotor 21 in the direction of the rotation center and attached in a cylindrical shape. The same number of brushes 27 are stacked and attached in the same cylindrical shape so as to be in contact with the respective slip rings 26. Thus, each pair of the slip ring 26 and the brush 27 constitutes an electric contact that can move relative to each other. The slip ring 26 and the brush 27 are covered with a cover 28 and protected from external dust and the like. In addition, slip ring 2
6, a third electric wire 32 is connected to the brush 27, and a fourth electric wire 33 is connected to the brush 27. The electric wire 32 is installed on the device disposed on the center swing body 2, and the electric wire 33 is installed on the base 1. Connected to the device.

The first electric swivel joint 20a
Since they have the same configuration, detailed description is omitted. here,
The two electric rotors of the first electric swivel joint 20a are respectively engaged with the stepped end surface 11a of the shaft 11 and the upper end surface of the first hydraulic / pneumatic rotor 12a by engaging positioning means (here, pins 23a and 23b). Positioned and locked. The slip ring 26 has the first
The electric wire 30 is connected, and the second electric wire 31 is connected to the brush 27.

FIG. 3 is a perspective view of a locking portion between the lower surface of the second electric rotor 22 and the upper end surface of the second hydraulic / pneumatic rotor 12b. Another embodiment relating to the means for positioning the engagement with the rotors 12a, 12b or the shaft 11 is shown. That is, in the engagement positioning means 40 shown in the figure, for example, a centering spigot hole 44 and a pair of projections 41, 41 are provided on the lower surface of the second electric rotor 22, and the second hydraulic / pneumatic rotor 12b is provided.
On the upper end surface of the, an annular projection 42 engaging with the spigot hole 44 and a pair of grooves 43, 43 engaging with the pair of projections 41, 41 are provided. Thus, during assembly, the positioning can be performed with the spigot, and the protrusion 41 and the groove 43 can be locked in the rotational direction, so that the assembly can be easily performed.

Normally, in a vehicle such as a hydraulic excavator having an upper revolving structure on a lower traveling structure, a driving source such as a hydraulic device or an electric device is mounted on the upper revolving structure (the uppermost revolving structure). In many cases, the upper revolving unit 3 is also equipped with hydraulic and pneumatic devices and electric devices. Therefore, in this case, wiring of the hydraulic system, the pneumatic system, and the electric system is required between the upper swing body 3 and the middle swing body 2 and between the upper swing body 3 and the base 1. Therefore, in FIG. 1, the signal connection between the upper revolving unit 3 and the middle revolving unit 2 is connected to the second hydraulic / pneumatic port 1 of the shaft 11 in the hydraulic system and the pneumatic system.
8b and the first hydraulic / pneumatic port 19c of the first hydraulic / pneumatic rotor 12a, and the electric system is the slip ring 26 of the first electric swivel joint 20a (ie,
The first electric wire 30) and the brush 27 (that is, the second electric wire 3)
1). In the hydraulic system and the pneumatic system, the signal connection between the upper-part turning body 3 and the base 1 is made by the second hydraulic / pneumatic port 18b of the shaft 11 and the third hydraulic / pneumatic of the second hydraulic / pneumatic rotor 12b. This is performed between the pressure port 19e.

On the other hand, signals of the electric system are transmitted between the upper swing body 3 and the middle swing body 2 by the first electric swivel joint 20a. 2 electric swivel joint 20b
Performs only the transmission of the electric signal between the center swing body 2 and the base body 1, so that they are connected via the first electric swivel joint 20 a and the second electric swivel joint 20 b at the same time. That is, the first electric swivel joint 2
0a 2nd electric wire 31 on the side of the central revolving superstructure 2 (brush 27 side)
And the middle revolving superstructure 2 of the second electric swivel joint 20b
Side (slip ring 26 side) and the third electric wire 32 of the first electric swivel joint 20a.
By using the wiring between the upper electric rotating body 3 and the base 1, it is possible to transmit an electric signal between the upper swing body 3 and the base 1 by using the wiring between the upper electric rotating body 3 and the fourth electric wire 33 of the second electric swivel joint 20b.

Next, a second embodiment of the swivel joint device 5 will be described with reference to FIG. FIG. 1 is a side sectional view of a swivel joint device 5 according to the present embodiment. Cylindrical first hydraulic / pneumatic rotor 12a, second electric swivel joint 20b and second hydraulic / pneumatic rotor 1 each having the same rotational center as the rotational center of the multiple revolving superstructure.
2b are provided adjacent to each other in order from the top, and the first hydraulic / pneumatic rotor 12a, the second electric swivel joint 20b, and the second hydraulic / pneumatic rotor 12b are coaxial with the rotation center from below. The shaft 11 is rotatably fitted. A shaft 1 inserted inside a first hydraulic / pneumatic rotor 12a or the like is provided below the shaft 11.
An enlarged diameter portion having a diameter larger than the diameter of the upper part of 1 is formed,
The stepped end surface 11a formed at the upper end of the enlarged diameter portion is the second end.
It is in contact with the lower end surface of the hydraulic / pneumatic rotor 12b. The first hydraulic / pneumatic rotor 12a is attached to the upper revolving unit 3 by bolts 4 via a flange 12c fixed to the outer peripheral portion of the first hydraulic / pneumatic rotor 12b.
Is fixed to the middle revolving unit 2 via a bracket 17 fixed to the outer peripheral portion, and the enlarged diameter portion of the shaft 11 is fixed to the base 1 via a bracket 16 fixed to the outer peripheral portion. .

A predetermined number of first hydraulic / pneumatic ports 19c are provided along the rotation center direction on the outer peripheral portion of the first hydraulic / pneumatic rotor 12a.
9c communicates with one or more annular grooves 19d formed on the inner peripheral surface of the first hydraulic / pneumatic rotor 12a via one or more radial first hydraulic / pneumatic circuits 19a. And
A plurality of conduits 18 are provided inside the shaft 11.
Are provided in the axial direction. A predetermined number of the pipelines 18 out of the plurality of pipelines 18 are formed in the plurality of second hydraulic / pneumatic ports 18 b disposed along the axial direction on the outer peripheral surface of the enlarged diameter portion of the shaft 11. A predetermined number of ports communicate with one or more annular grooves 19g provided on the outer peripheral surface of the shaft 11 so as to face the respective annular grooves 19d. Thus, the shaft 11 and the first hydraulic / pneumatic rotor 12
and a hydraulic signal between the first hydraulic and pneumatic swivel joints 10a.

A predetermined number of third hydraulic / pneumatic ports 19e are provided along the rotation center direction on the outer peripheral portion of the second hydraulic / pneumatic rotor 12b. The port 19e communicates with one or more annular grooves 19f formed on the inner peripheral surface of the second hydraulic / pneumatic rotor 12b via one or more radial second hydraulic / pneumatic circuits 19b. . The predetermined number of the plurality of conduits 18 provided inside the shaft 11 is the predetermined number of the plurality of second hydraulic / pneumatic ports 18 b of the enlarged diameter portion of the shaft 11, One or more annular grooves 19h provided on the outer peripheral surface of the shaft 11 facing the respective annular grooves 19f communicate with each other. Thereby, the shaft 11 and the second hydraulic pressure
The hydraulic signal between the air pressure rotor 12b and the air pressure rotor 12b is rotatably connected to form a second hydraulic / pneumatic swivel joint 10b.

A holder 50 having an outer diameter larger than the inner diameter of the first hydraulic / pneumatic rotor 12a is fastened to the upper end surface of the shaft 11 with a bolt 51. 1st hydraulic pressure
A hollow portion having an inner diameter slightly larger than the outer diameter of the holder 50 is formed at the upper end of the pneumatic rotor 12a, and a stepped end surface 57 is formed at the bottom of the hollow portion. The holder 50 is locked on the upper surface of the stepped end surface 57,
The shaft 11 is prevented from falling down. Further, a hollow body 52 is attached to the upper end surface of the first hydraulic / pneumatic rotor 12a, and an electric shaft 53 is attached to the center of the body 52 and to the upper part of the holder 50. I have. Bearings 54 and 55 are interposed between the body 52 and the electric shaft 53,
Holds the electric shaft 53 rotatably via the bearings 54 and 55. Therefore, when the shaft 11 rotates, the electric shaft 53 also rotates integrally.

A predetermined number of slip rings 26 are stacked on the electric shaft 53 in the direction of the rotation center and attached in a cylindrical shape. A number of brushes 27 are attached to the respective slip rings 26 at all times in electrical contact with each other and are stacked. These slip ring 26 and brush 2
Reference numeral 7 denotes a mounted electric swivel joint 20c which is disposed on the same concentric cylindrical surface and performs relative rotation with the relative rotation of the shaft 11 and the first hydraulic / pneumatic rotor 12a. I have.

The second electric swivel joint 20b
Is similar to the configuration in the first embodiment, and the description is omitted here. The third electric wire 32 and the fourth electric wire 33 wired to the slip ring 26 and the brush 27 of the second electric swivel joint 20b respectively connect signals of an electric system between the upper swing body 3 and the middle swing body 2. . The fifth electric wire 34 connected to the brush 27 of the mountable electric swivel joint 20c is drawn out of the body 52, and the sixth electric wire 35 connected to the slip ring 26.
Is taken out from the lower end of the shaft 11 via the electric shaft 53 and the through hole 56 provided in the shaft 11. Therefore, the fifth electric wire 34 and the sixth electric wire 35 can connect signals of an electric system between the upper swing body 3 and the base 1. When it is necessary to connect an electric signal between the center revolving superstructure 2 and the base 1, by connecting some signal lines of the third electric wire 32 and the fifth electric wire 34, the second electric wire is connected. The connection can be made via the electric swivel joint 20b and the mounted electric swivel joint 20c.

In the above embodiment, an example is shown in which the shaft 11 is attached to the base 1 or the uppermost revolving structure (for example, the upper revolving structure 3), but the present invention is not limited to this. Absent. For example, by combining the examples of the first embodiment and the second embodiment, the shaft 11 is attached to an intermediate revolving superstructure (for example, the lower revolving superstructure 2), and the shaft below the shaft 11 as shown in FIG. 11, a first electric swivel joint 20a, a first hydraulic rotor 12a, a second electric swivel joint 20b, a second hydraulic rotor 12b, and the like.
, The second hydraulic rotor 12b,
Second electric swivel joint 20b, first hydraulic rotor 1
2a and the mounted electric swivel joint 20c (or
It can be configured by a combination of the first electric swivel joint 20a) and the like. This makes it possible to respond to various arrangements of electrical equipment and hydraulic and pneumatic equipment of multiple revolving units, for example, optimal signal for wiring of the shortest distance, wiring for important equipment such as drive source, etc. Can be transmitted by transmission method.

As described above, according to the swivel joint device of the multiple turning mechanism according to the present invention, the annular slip ring and the brush are provided so as to be relatively rotatable about the same axis while always facing each other and always in contact with each other. The electric swivel joint having a plurality of pairs is fitted around the outer periphery of a shaft having the same axis as the center of rotation. When multiple revolving structures having the same revolving center are provided, electric swivel joints are closely attached to positions where electric signals need to be transmitted between the base and the revolving structure, or between the two revolving structures, and the outer periphery of the shaft is provided. Insert into the part. The first electric rotor to which the slip ring is attached and the second electric rotor to which the brush is attached are respectively connected to the adjacent base body and the rotating body or to the adjacent two rotating bodies.
It is positioned and locked on one revolving superstructure. At this time, each electric rotor may be locked to the base or each revolving unit via a rotor for transmitting a hydraulic / pneumatic signal, or the rotor for the hydraulic / pneumatic signal is unnecessary. In this case, it may be directly locked to the base or each revolving structure. Thus, electric signals can be easily transmitted between multiple revolving units having the same revolving center. If an electric signal cannot be transmitted between two separated revolving superstructures or between the separated base and revolving superstructure by one electric swivel joint, transmission is possible by connecting a signal line via an intermediate electric swivel joint. Becomes

The rotor for hydraulic and pneumatic signals can be inserted into the shaft to form a hydraulic and pneumatic swivel joint. That is, a cylindrical oil pressure / pneumatic signal rotor is provided with an annular groove on the inner peripheral surface and a plurality of hydraulic / pneumatic signals.
Provided in communication with the pneumatic port, and on the shaft,
A plurality of hydraulic / pneumatic ports disposed on an outer peripheral portion in the vicinity of a portion (for example, an enlarged portion such as an upper end portion or a lower end portion) attached to the base body or the revolving body, and opposed to the annular groove of the rotor. It is provided in communication with the annular groove on the outer peripheral portion. Then, these rotors are closely fitted and inserted into positions in the multiple revolving structure where a hydraulic signal is required to be transmitted, whereby a hydraulic / pneumatic swivel joint of the multiple revolving mechanism can be configured. As a result, hydraulic and pneumatic signals can be easily transmitted between multiple revolving units having the same revolving center.

Therefore, a plurality of electric swivel joints and hydraulic / pneumatic swivel joints corresponding to the multiple revolving superstructures can be sequentially fitted and mounted on the outer periphery of the same shaft along the axial direction, thereby facilitating mounting and assembling. . Further, since a plurality of electric swivel joints and hydraulic / pneumatic swivel joints can be attached to the same shaft in close contact, the overall height of the swivel joint device can be reduced.
Further, the hydraulic / pneumatic signal can be directly transmitted from the uppermost revolving superstructure (for example, the upper revolving superstructure in the embodiment) to the lower revolving superstructure or the base without passing through the intermediate hydraulic and pneumatic swivel joint. Therefore, an extra port for relaying is not required, and the number of hydraulic and pneumatic ports can be reduced. This makes it possible to further reduce the overall height of the swivel joint device. Therefore, it is possible to reduce the overall height of the applied industrial vehicle, and to reduce the weight and the cost.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a first embodiment of a swivel joint device of the present invention.

FIG. 2 is a detailed sectional view of an electric swivel joint of the swivel joint device of the present invention.

FIG. 3 is a perspective view showing another example of the engagement positioning means of the electric rotor and the hydraulic / pneumatic rotor of the electric swivel joint device.

FIG. 4 is a side sectional view of a second embodiment of the swivel joint device of the present invention.

FIG. 5 is a side sectional view showing an example of a conventional swivel joint device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Base | substrate, 2 ... Middle revolving superstructure, 3 ... Upper revolving superstructure, 5 ... Swivel joint device, 10a ... 1st hydraulic / pneumatic swivel joint, 10b ... 2nd hydraulic / pneumatic swivel joint, 11 ... Shaft, 11a, 57 ... stepped end face, 12a
... first hydraulic / pneumatic rotor, 12b ... second hydraulic / pneumatic rotor, 13,50 ... holder, 15,25 ... friction reducing means,
16, 17: bracket, 19a: first hydraulic / pneumatic circuit, 19b: second hydraulic / pneumatic circuit, 19c: first hydraulic / pneumatic circuit
Pneumatic ports, 19d, 19f, 19g, 19h: annular groove, 19e: third hydraulic / pneumatic port, 20a: first electric swivel joint, 20b: second electric swivel joint, 21: first electric rotor, 22 ... 2nd electric rotor, 2
3a, 23b ... pins (engaging positioning means), 24, 5
4, 55: bearing, 26: slip ring, 27: brush, 30: first electric wire, 31: second electric wire, 32: third electric wire, 33: fourth electric wire, 34: fifth electric wire, 35: sixth electric wire , 40: engagement positioning means, 41: projection, 42: annular projection, 43: groove, 44: spigot hole, 52: body, 5
3 ... electric shaft, 56 ... through hole.

Claims (10)

[Claims] 1. A revolving structure having two or more revolving bodies having the same revolving center and revolving independently of each other is provided on an upper part of a base body (1) so as to be freely rotatable. A swivel joint device for rotatably connecting signals of an electric system between the revolving structures, or between the revolving structures, wherein the swivel joint device has the same axis as the center of revolving, and any one of the base (1) and the plurality of revolving units. Shaft attached to one
(11), is fitted around the outer periphery of the shaft (11) so as to be rotatable about the axis of the shaft (11) as a center of rotation, and is sequentially overlapped and inserted in the direction of the center of rotation. ) And the revolving superstructure, or between two adjacent revolving superstructures, a first electric rotor (21) locked to the other, and a second electric rotor (22) locked to the other. Having an annular slip ring (26) attached to the first electric rotor (21) and a brush (27) attached to the second electric rotor (22) so as to be relatively rotatable, and A swivel joint device comprising: at least one pair of electric swivel joints (20a, 20b) provided in constant contact with each other. 2. A revolving structure having two or more revolving bodies having the same revolving center and revolving independently of each other is provided on the upper part of the base (1) so as to be revolvable. A swivel joint device for rotatably connecting signals of an electric system and a hydraulic / pneumatic system between or between respective revolving bodies, the swivel joint device having the same axis as a revolving center, and the base (1) and a plurality of Shaft attached to one of the revolving structures
(11), one or more hydraulic / pneumatic ports (18b) provided along the axial direction on the outer periphery of the shaft (11), and an axial center higher than the hydraulic / pneumatic ports (18b). One or more annular grooves (19g, 19h) provided on the outer periphery of the shaft (11) in the upper and / or lower direction, and each annular groove of the shaft (11) provided in the shaft (11). (19g, 19h) and each hydraulic / pneumatic port (18b) at one or more conduits (18), and on the outer periphery of the shaft (11) where the annular grooves (19g, 19h) are provided. A cylindrical hydraulic / pneumatic rotor (12a, 12b) that is rotatably inserted and is fixed to the base (1) or the revolving body without the shaft (11) attached thereto; and the hydraulic / pneumatic rotor. One or more hydraulic and pneumatic ports (19c, 19e) provided on the outer peripheral portion of the (12a, 12b) and the predetermined annular groove (19g, 19h) of the shaft (11). Provided on the inner peripheral surface of the pneumatic rotor (12a, 12b) One or more annular grooves (19d, 19f) and, provided inside the hydraulic and pneumatic rotor (12a, 12b), hydraulic and
Each of the hydraulic and pneumatic ports (19c, 19c) of the pneumatic rotor (12a, 12b)
e) and at least one hydraulic / pneumatic swivel joint (10a, 10b) comprising one or more hydraulic / pneumatic circuits (19a, 19b) for communicating the annular grooves (19d, 19f) respectively.
And the outer periphery of the shaft (11) is rotatable around the axis of the shaft (11) as a center of rotation, and is inserted while being sequentially overlapped in the direction of the center of rotation, and adjacent to the base (1) or The shaft (11) and the revolving superstructure or the hydraulic / pneumatic rotor (1
2a, 12b), or between the adjacent revolving superstructure and the hydraulic / pneumatic rotor (12a, 12b). A second electric rotor (22) locked to the other, an annular slip ring (26) attached to the first electric rotor (21), and a second electric rotor (22).
An electric swivel joint (20a, 20b) provided with at least one pair of brushes (27) attached to the electric rotor (22) so as to be relatively rotatable and always in contact with each other. Swivel joint device. 3. The electric swivel joint (20a, 20b).
The swivel joint device according to claim 1 or 2, wherein a plurality of pairs of the slip ring (26) and the brush (27) are stacked in the direction of the rotation center and are respectively arranged on the same cylindrical surface. 4. The same electric swivel joint (20).
a, 20b) and the second electric rotor (2).
4. The swivel joint device according to claim 1, wherein a friction reducing means is provided on a contact surface in an axial center direction with the swivel joint. 5. The swivel joint device according to claim 1, wherein the first electric rotor (21) and the second electric rotor (22) of the electric swivel joint (20a, 20b) are adjacent to each other. The substrate
(1) A swivel joint device provided with engagement positioning means (23a, 23b, 40) for positioning with respect to the revolving superstructure and locking in the rotation direction. 6. A swivel joint apparatus according to claim 1, wherein a plurality of said electric swivel joints (20a, 20b) are provided on an outer peripheral portion of said shaft (11). 7. A slip ring of one of the two adjacent electric swivel joints (20a, 20b) locked to the same revolving structure, the one of the electric swivel joints being locked to the revolving structure. (26), and the brush (2) of the other electric swivel joint on the side
The signal lines respectively connected to 7) are connected to each other to perform signal transmission between the upper and lower bases (1) of the revolving structure and the revolving structure or between the upper and lower revolving structures. The swivel joint device according to claim 6, wherein 8. The swivel joint device according to claim 1, wherein the shaft is attached to an electric shaft (53) attached to an upper end or a lower end of the shaft (11). An annular slip ring (26) from which wiring is taken out through a through hole (56) provided in the axial direction inside (11), and a rotatable outer periphery of the electric shaft (53). Provided,
Also, the slip ring is attached to the base (1) to which the shaft (11) is attached, the base (1) different from the revolving body, or the body (52) locked to another revolving body.
A swivel joint device comprising a mounted electric swivel joint (20c) having at least one pair of a brush (27) and a brush (27) that is in constant contact with each other. 9. A revolving structure having two or more revolving bodies having the same revolving center and revolving independently of each other is provided on the upper part of the base (1) so as to be freely rotatable. A signal transmission method of a swivel joint device for rotatably transmitting a signal of an electric system between rotating bodies or between rotating bodies, wherein a separated base body having one or more other rotating bodies interposed therebetween.
(1) Among a plurality of electric swivel joints for transmitting electric signals between the revolving superstructure and the two revolving superstructures, respectively, sequentially connect signal lines between two electric swivel joints adjacent to each other. A signal transmission method for a swivel joint device, characterized in that the signal is connected to transmit an electric signal in a freely rotatable manner. 10. A central revolving unit (2) and an upper revolving unit (3) having the same revolving center and revolving independently of each other are provided in turn on an upper part of a base (1), and Substrate
(1) A signal transmission method for a swivel joint device for transmitting a signal of an electric system between a center revolving superstructure (2) and an upper revolving superstructure (3) in a swivelable manner. ) Is routed through a through hole (56) in the shaft (11) of the electric swivel joint (20c) locked to the base (1) or the upper swing body (3). And the central revolving superstructure
(2) an electric swivel joint (20b) disposed between the middle revolving unit (2) and the upper revolving unit (3), and the electric swivel joint (20c). A signal transmission method for a swivel joint device, characterized in that the signal can be sequentially transmitted from the central revolving superstructure (2) to the base (1) via the upper revolving superstructure (3) by using the above method.