JP3477553B2 - Multi-pole electric rotary joint - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-pole electric rotary joint. 2. Description of the Related Art A manipulator is used in a recent automated manufacturing line, and the manipulator is provided with a multi-pole electric rotary joint because it has a function of rotating the wrist in the forward and reverse directions. As the multi-pole electric rotary joint, as shown in FIG. 6, a slip ring 80 and a brush 81 are arranged in parallel with the axis of the wrist axis L, and as shown in FIG.
There is a type in which a ring plate 90 is provided on the same axis as the wrist axis L, and a slip ring 91 and a brush 92 are arranged in the radial direction of the ring plate 90. However, a multi-pole electric rotary joint of the type shown in FIG. 6 has a problem that it becomes longer in the axial direction of the wrist axis L, while a multi-pole electric rotary joint of the type shown in FIG. At the same time, there arises a problem that the ring plate 90 on which the slip ring 91 is formed is bent by the pressing force from the brush 92, and the brush 92 does not properly contact the slip ring 91. Therefore, the industry using multi-pole electric rotary joints has long awaited the development of a multi-polar electric rotary joint which does not grow in the axial and radial directions of the wrist shaft and allows the brush to properly contact the slip ring. In. Therefore, according to the present invention, the size of the wrist shaft does not increase in the axial direction and in the radial direction.
An object of the present invention is to provide a multi-pole electric rotary joint in which a brush properly contacts a slip ring, and does not increase in the axial and radial directions of a wrist shaft, so that the brush properly contacts a slip ring, and the brush is replaced. It is an object of the present invention to provide a multi-pole electric rotary joint capable of easily performing the above. Means for Solving the Problems [0007] The present invention comprises a rotating part and a fixed part, of which one of the rotating part and the fixed part is provided with a slip ring and the other is provided with a slip ring. The brushes that come into contact with the slip ring are provided on the sides, respectively, and the ring plates are arranged in a manner orthogonal to the rotation axis of the rotating unit, and on both sides of the ring plate, the center of the point that intersects with the rotation axis. In a multipolar electric rotary joint in which a plurality of slip rings having different radii are formed and a brush is arranged in contact with the slip ring in a manner to sandwich the ring plate from both sides, a plurality of slip rings are arranged on each surface side of the slip ring. The brushes are housed in a single brush case, and the rotating portion has a space opened to the outside and in which the brush case is mounted. The open portion of the space is closed by a connector, and the open portion formed when the connector is removed is set to a size that allows the brush case to be inserted and removed, and a plurality of brushes can be replaced together with the brush case via the open portion. I can do it. The function of the multi-pole electric rotary joint according to the present invention will be described in the following embodiments of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described with reference to the drawings showing embodiments. (Embodiment 1) As shown in FIGS. 1 and 4, a multi-pole electric rotary joint according to this embodiment includes a rotating unit 1 connected to a rotating shaft N1 constituting a wrist N of a manipulator M; , A ring plate 3 bolted to the fixing portion 2, and brush cases 4 and 4 holding a plurality of brushes 42. And a holding plate 5. In addition,
“Rotation” is a concept that includes forward and reverse rotation and rotation. As shown in FIGS. 1 and 5, the rotating part 1 is a space that is open to the outside and in which the brush cases 4 and 4 are mounted.
An open portion of the space 10 is provided with a connector 12.
Is closed. As shown in FIGS. 1 and 5, the fixed portion 2 has a wiring guide path 20 formed from the inner peripheral portion of the ring plate 3 to the connector 22. The opening is closed by the connector 22. The ring plate 3 is, as shown in FIG.
As shown in FIG. 2, a plurality of slip rings 33 are formed on the front surfaces of the substrates 31 and 32. Where the slip ring
Numerals 33 are electrically connected to terminals 34 formed on the inner peripheral portion of the ring plate 3 as shown in FIG. 2, respectively, and the terminals 34 and the connectors 22 are connected by wiring guides as shown in FIG. They are electrically connected by an electric wire 35 inserted into the road 20. As shown in FIGS. 3 and 4, the brush case 4 includes a brush holding plate 40, a power transmission plate 41, a brush 42, and a compression coil spring 43.
The power transmission plate 41 and the power transmission plate 41 are detachably integrated with each other by bolts or the like. As shown in FIGS. 3 and 4, the brush holding plate 40 has a plurality of through holes 40a for mounting the brushes 42 and the compression coil springs 43. On the other hand, the power transmission plate 41 has a structure shown in FIGS. As shown, the electrode is located at a position corresponding to the through hole 40a.
Terminals formed with 41a and assembled at the lower end
The terminal 41b and the connector 12 are electrically connected to each other by an electric wire 41c. The pressing plate 5 presses the brush case 4 so that the tip of the brush 42 is securely electrically connected to the slip ring 33. Here, as shown in FIG. 1, the brush cases 4 and 4 are provided with the space portions 10 so as to sandwich the ring plate 3 therebetween.
The plurality of brushes 42 can be easily replaced by inserting and removing the brush case 4 with respect to the space 10 with the connector 12 and the holding plate 5 removed. Since this multi-pole electric rotary joint has the above-described configuration, it has the following functions. Since the brush 42 is arranged so as to be in contact with the slip ring 33 in such a manner that the ring plate 3 is sandwiched from both sides, the size does not increase in the axial direction and the radial direction of the rotation shaft N1 constituting the wrist N. Since the brush 42 is arranged so as to be in contact with the slip ring 33 in such a manner that the ring plate 3 is sandwiched from both sides, the force from the brush 42 to the ring plate 3 is canceled out, and the ring plate 3 is hardly bent. Therefore, the brush 42 properly contacts the slip ring 33. As described above, since the plurality of brushes 42 can be replaced simply by removing and inserting the brush cases 4 and 4, the replacement operation is easy. By using the space from which the brush cases 4 and 4 are removed, it is possible to remove wear powder attached to the surface and the periphery of the split ring 33. The electrical connection with connectors 22 and 12
→ Electric wire 35 → Terminal 34 → Slip ring 33 → Brush 42 → Compression coil spring 43 → Electrode 41a → Terminal 41b → Electric wire 41c → Connector 12 The present invention has the following effects since it has the above-described configuration. (Effect of Claim 1) As is clear from the description of the embodiment of the present invention, the multi-pole electric rotary joint in which the brush does not increase in the axial and radial directions of the wrist shaft and the brush properly contacts the slip ring. Could be provided. (Effects of the invention according to claim 2) As is clear from the section of the embodiment of the invention, the brush does not become large in the axial direction and the radial direction of the wrist shaft, the brush properly contacts the slip ring, and the replacement of the brush is performed. An easy-to-use multi-pole electric rotary joint was provided.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of a multipolar electric rotary joint according to an embodiment of the present invention. FIG. 2 is a front view of a ring plate constituting the multipolar electric rotary joint. FIG. 3 is a perspective view of a brush case and a holding plate constituting the multipolar electric rotary joint. FIG. 4 is a partial cross-sectional view of the brush case and the holding plate. FIG. 5 is a cross-sectional view of the multipolar electric rotary joint with the brush case and the holding plate removed. FIG. 6 is a partial cross-sectional view of a prior art multi-pole electric rotary joint. FIG. 7 is a partial cross-sectional view of a prior art multi-pole electric rotary joint. [Description of Signs] 1 Rotating part 2 Fixed part 3 Ring plate 4 Brush case 5 Pressing plate 33 Slip ring 40 Brush holding plate 41 Power transmission plate 42 Brush 43 Compression coil spring

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H01R 39/00 B25J 19/00

Claims (1)

(57) [Claim 1] A rotating part and a fixed part, of which one of the rotating part and the fixed part is provided with a slip ring, and the other is provided with a brush which is in contact with the slip ring. Are respectively provided, and the ring plates are arranged in a manner orthogonal to the rotation axis of the rotating unit, and a plurality of slip rings having different radii centered on points intersecting with the rotation axis are formed on both surfaces of the ring plate. In the multi-pole electric rotary joint in which the brushes are arranged so as to be in contact with the slip ring in such a manner that the ring plate is sandwiched from both sides, the plurality of brushes arranged on each surface side of the slip ring each have a single brush case. The rotating part has a space part which is open to the outside and in which a brush case is mounted, and the opening part of the space part is closed by a connector. The open part formed when the connector is removed is set to a size that allows the brush case to be inserted and removed, and a plurality of brushes can be replaced together with the brush case through the open part. Electric rotary joint.