JPH0516151B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a contact device that is disposed between a rotating body and a supporting part that supports the rotary body, and is used to ensure the transmission and reception of electrical signals between the two. It is related to.

[Conventional technology]

For example, in a truck crane 1 shown in FIG. 14, in which a crane house 4 supporting a boom 3 is rotatably mounted on a chassis frame constituting a vehicle body 2, electric equipment on the vehicle body 2 side is For example, when connecting a generator and electrical equipment on the crane house 4 side, if the two are directly connected with a cable, when the crane house 4 rotates on the vehicle body 2, the cable will be twisted and the cable will be twisted. There is a risk of cutting. For this reason, a contact device consisting of a slip ring and a brush is used for electrical connection at the locations described above. The contact device 10, as shown in the schematic diagram of FIG.
A predetermined number of slip rings 13 made up of a metal ring 11 and an insulator 12 arranged on the inner periphery are arranged at equal intervals around the outer periphery of the shaft 14, and
A brush 15 held by a brush holder (not shown) is brought into contact with the outer peripheral surface of each slip ring 13. Furthermore, this brush 15
The slip ring 13 is constantly held by the elastic force of a spring (not shown) built into the brush holder.
It is designed to make contact with Then, the contact device 10 is arranged between the car body 2 and the crane house 4 so that the shaft 14 of the contact device 10 coincides with the rotation center of the crane house 4, the shaft 14 is fixed to the car body 2, and the brush Fix the brush holder holding 15 to the crane house 4 side,
The ring 11 of the slip ring 13 and the electrical equipment on the vehicle body 2 are connected by a cable, and the brush 15
and electrical equipment on the crane house 4 side are connected by cables. By doing this, even if the crane house 4 rotates on the car body 2, the brush 15 always rotates while being in contact with the outer peripheral surface of the slip ring 11, so that the electric equipment on the car body 2 side and the crane house 4 It is possible to maintain electrical connection with the electrical equipment on the side.

[Problem to be solved by the invention]

As described above, the contact device 10 consisting of the slip ring 13 and the brush 15 is used to connect the electrical devices disposed in the vehicle body 2 and the crane house 4, respectively. Incidentally, in recent years, the truck crane 1 has also been equipped with electronic devices such as computers, and has been equipped with vortex prevention devices, boom angle of attack limiting devices,
Various safety devices such as boom angle support devices are being controlled by electronic control in an effort to improve safety systems. However, when electronic equipment such as a computer is mounted on the truck crane 1 as described above, the contact device 10 disposed between the vehicle body 2 and the crane house 4 receives, for example, a weak current flowing between the computer and the sensor. At the same time as it becomes necessary to send electrical signals consisting of However, the conventional contact device 10 is designed mainly to flow power for motive power, and the contact between the slip ring 13 and the brush 15 is also rough, so that the electrical signal handled by the above-mentioned computer etc. When you run
This contact point picked up noise, which caused the problem that the signal could not be transmitted accurately. Furthermore, because the contact device 10 cannot be provided with a large number of contacts due to its structure, there is a problem in that there may be a shortage of contacts.

[Means to solve the problem]

The contact device has a lower inner cylinder and an upper inner cylinder coaxially arranged at a predetermined interval, a cylindrical part and a flange part extending around the outer circumference thereof, and a predetermined number of contact devices are stacked in the lower part. A support plate disposed between the cylinder and the upper inner cylinder so as to be integrated with both, a plurality of annular conductive rings arranged concentrically on the flange surface of each support plate, and a lower inner cylinder and A lower outer cylinder and an upper outer cylinder rotatably arranged on the outer periphery of the upper inner cylinder via bearings, a plurality of struts bridged between the lower outer cylinder and the upper outer cylinder, and supports in a stacked state. A predetermined number of brackets are arranged in the space formed between the opposing flanges of the plate, supported by each support, and a pair of hemispherical contact bodies at the tips of the arm parts are connected to the support plate flange. and a predetermined number of contact plates each supported by each bracket so as to be in contact with the surface of the corresponding conductive ring among the plurality of conductive rings arranged on the conductive ring. The surface is curved and has a pear-shaped surface, and the pear-shaped surface is impregnated with a conductive lubricant.

[Effect]

As described above, by stacking support plates with a plurality of conductive rings arranged on the surface of the flange, and contacting each conductive ring of each support plate with a contact body attached to the tip of an arm provided on the contact plate. , a set of two contact bodies forming a large number of contacts in a limited space and in contact with the conductive ring;
By making the contact body hemispherical, making the surface of the conductive ring a curved pear-shaped surface, and impregnating this pear-shaped surface with a conductive lubricant, the contact plate and the conductive ring are made extremely stable. It is designed so that they are brought into contact with each other in this state.

〔Example〕

1 and 2 show a contact device 2 according to the present invention.
In the figure, 21 is a lower inner cylinder, and 22 is a bearing 2 on the outer periphery of the lower inner cylinder 21.
The lower outer cylinder is rotatably arranged via the lower outer cylinder.
24 is a predetermined number (15 in this example) on the lower inner cylinder 21.
25 is a disk-shaped support plate made of laminated insulators, and 25 is a plate 2 on the uppermost support plate 24'.
6 is an upper inner cylinder rotatably disposed via a bearing 28, and 27 is an upper outer cylinder rotatably disposed on the outer periphery of the upper inner cylinder 26 via a bearing 28. The lower inner cylinder 21 and the upper outer cylinder 25 are connected by a bolt 29 passing through a support plate 24 located between them, and the upper and lower inner cylinders 21, 25 and the support plate 24 are integrated. At the center of the above three members is a shaft 30.
is penetrated. Further, each of the above-mentioned support plates 24 has a third
As shown in FIG. 5, a bolt hole 31 through which the bolt 29 passes and a through hole 3 for passing the cable
2, and a flange part 34 that extends around the cylindrical part 33. On the surface 34a side of the flange part 34, there is an annular groove 35 for holding a conductive ring 39, which will be described later. A plurality of strips (three strips in this embodiment) are carved concentrically.
Further, a slit 3 is formed at a predetermined location on the peripheral edge of each annular groove 35, through which a tongue piece 40 provided on the conductive ring 39 passes.
6 is provided at a predetermined location on the annular groove 35,
The bottom of the annular groove 35 and the back surface 34b of the flange portion 34
An opening 37 is provided for connecting the two. Furthermore,
A groove 38 is carved on the back surface 34b side of the flange portion 34 to connect each opening 37 with the through hole 32 provided in the cylindrical portion 33.
The tip of the cable (not shown) that is passed through the groove 38 passes through the opening 37 and reaches the back surface of the conductive ring 39 disposed on the surface 34a of the flange portion 34, where the conductive ring 39. The conductive ring 39 made of a conductive metal and fitted into the annular groove 35 of the support plate 24 has a diameter so as to match each of the three annular grooves 35, as shown in FIGS. 6 to 8. Three different types are available, and each conductive ring 39 is provided with a tongue piece 40 on its peripheral edge that passes through a slit 36 provided at the peripheral edge of the annular groove 35. Then, by fitting the conductive ring 39 into the annular groove 35 and bending the tip of the tongue piece 40 passing through the slit 36 horizontally on the back surface 34b side of the flange portion 34, the conductive ring 39 is fitted into the annular groove 35. It is fixed to . Further, the surface 39a of this conductive ring 39 is a convex curved surface as shown in FIG.
The surface 39a is sanded by sandblasting or the like to form a pear-shaped surface, and a conductive lubricant such as grease is applied to the curved surface 39a, which forms the pear-shaped surface. By impregnating the pear surface with grease, the surface 39a of the conductive ring 39 is made to have lubricity over a long period of time. When the support plates 24 equipped with the conductive rings 39 described above are laminated and integrated between the upper and lower inner cylinders 21 and 25, the back surfaces of the two support plates 24 are brought into contact with each other as shown in FIG. It is designed to be layered. In addition, the upper and lower inner cylinders 21, 25
Upper and lower outer cylinders 22, 27 rotatably arranged on the outer periphery of the
In between, as shown in Figures 1 and 2, there are multiple pieces,
In this embodiment, six columns 41 are bridged, and each column 41 has a stacked support plate 2.
A bracket 42 extending toward the space formed between the two opposing flange portions 34 is fixed. Then, the flange portion 3 is attached to this bracket 42.
A contact plate 43 made of conductive metal and in contact with the conductive ring 39 on the top 4 is screwed.
As shown in FIGS. 10 to 13, this contact plate 43 includes a flat plate portion 44 that contacts the surface of the bracket 42 and is screwed, and two arm portions 45 extending from the flat plate portion 44. A conductive ring 39 is attached to the tip of the arm portion 45.
A hemispherical contact body 46 that comes into contact with the surface is fixedly attached. Then, the flat plate part 44 of the contact plate 43 is screwed to the bracket 42, and the contact body 46 at the tip of the arm part 45 extending from the flat plate part 44 is attached to the support plate 24.
By making contact with one of the conductive rings 39 fixed above, one contact is formed in this part, and in this way, one contact is formed for one conductive ring 39. By configuring three contact points for one support plate 24, and stacking 15 of these support plates 24, 45
It is designed to constitute individual independent contact points.
Note that one contact plate 43 is provided with two arm portions 46, and one contact plate 4 is provided for one conductive ring 39.
The reason why 3 contacts at two points is to keep the electrical contact between the two always stable.
The opening angle of the pair of arm portions 45 of this contact plate 43 is determined by the conductive ring 3 located on the inner periphery of the support plate 24.
9 is made small as shown in FIG. 10, and the part that comes into contact with the conductive ring 39 located on the outer periphery is made large as shown in FIG. 12.
Furthermore, the mounting position of the contact plate 43 to the bracket 42 is as shown in FIG. By screwing the parts that come into contact with the conductive ring 39 to the tip side of the bracket 42, each contact plate 43 can be connected to the support plate 24.
It is arranged to be in stable contact with three types of conductive rings 39 of different diameters fixed above. Further, the lower outer cylinder 22 supporting the bracket 42 via the strut 41 includes upper and lower inner cylinders 21 and 25 that sandwich the support plate 24 in a laminated state, and an upper outer cylinder 2.
A cylindrical casing 47 large enough to cover all of the six pillars 41 that support the conductive ring 39 and the contact plate 43 is installed to prevent dust from forming in the contact area between the conductive ring 39 and the contact plate 43. It is designed to prevent it from sticking.

When using the contact device 20 having the above configuration, for example, to connect an electronic device mounted on the vehicle body 2 side of the truck crane 1 and an electronic device mounted on the crane house 4 side, the axis of the contact device 20 and the crane The contact device 20 is arranged in the truck crane 1 so that the center of rotation of the house 4 is coaxial with it, and for example, the lower inner cylinder 21 is fixed to the vehicle body 2 side, and the lower outer cylinder 22 is fixed to the crane house 4 side. Then, cables extending from the electronic equipment on the vehicle body 2 side are connected to each conductive ring 39 on the support plate 24 that is integrated with the upper and lower inner cylinders 21 and 25, and the upper and lower outer cylinders 22 and 27, the support column 41, and the bracket are connected. By connecting cables extending from electronic equipment on the crane house 4 side to each contact plate 43 connected via 42,
Electronic devices mounted on the vehicle body 2 side and the crane house 4 side are electrically connected to each other. At this time, since the contact device 20 is configured with 45 independent contacts, there is no fear of a shortage of contacts. In this state, when the crane house 4 rotates on the vehicle body 2, the upper and lower outer cylinders 22 and 27 of the contact device 20 also rotate together with the crane house 4, and the upper and lower outer cylinders 2
The contact plate 43 connected to 2 and 27 via the support 41 and bracket 42 also rotates, but at this time,
The two contact bodies 46 of the contact plate 43 are connected to the conductive ring 3
The vehicle body 2 simply moves on the surface 39a of the vehicle body 9 while maintaining a contact state, and the two do not separate.
The electrical connection between the electrical equipment on the side and the electronic equipment on the crane house 4 side is maintained. Further, the surfaces 39a of the two contact bodies 46 and the conductive ring 39 are curved surfaces, and the surface 39a of the conductive ring 39 is curved.
Since the surface 39a is impregnated with conductive grease, the two can move relative to each other while maintaining a very stable contact state. Therefore, even if a weak electrical signal flows between the two, there is no need to worry about noise being picked up in this part, and electrical signals can be exchanged between the electronic equipment on the car body 2 side and the electronic equipment on the crane house 4 side. Can be done accurately.

In the above embodiment, three conductive rings 39 are mounted on the support plate 24, and 45 contacts are constructed by stacking 15 of these support plates 24. The number of contacts can be freely changed by changing the number of conductive rings 39 to be attached and the number of stacked support plates 24. Furthermore, it goes without saying that the contact device 20 according to the present invention can also be used for devices other than the above-mentioned truck cranes, as long as it is necessary to send and receive electrical signals between a rotating body and a supporting portion that supports it. It is.

〔Effect of the invention〕

As described above, the contact device according to the present invention has a predetermined number of stacked support plates each having a plurality of conductive rings arranged coaxially, and a contact plate is brought into contact with each conductive ring of each of the support plates, thereby providing a large number of contacts. Since it is possible to incorporate the device compactly, there is no shortage of contacts unlike in conventional contact devices. Further, in the present invention, a pair of arms are provided on the contact plate, and a contact body that contacts the conductive ring is fixed to the tip of the pair of arms, and the contact body is made into a hemispherical shape, and the surface of the conductive ring is curved. By impregnating the pear-shaped ground with a conductive lubricant, it is possible to maintain a very stable contact between the contact plate and the conductive ring, which is different from the conventional method. It becomes possible to send electrical signals consisting of a weak current, which was not possible with conventional contact devices, and it becomes possible to send and receive electrical signals between a computer and a sensor via the contact device.
Furthermore, the present invention allows the surface of the conductive ring to maintain lubricity over a long period of time by impregnating the pear-shaped surface of the conductive ring with a lubricant, thereby minimizing wear on this part. This made it possible to extend the life of the contact device.

[Brief explanation of the drawing]

FIG. 1 is a partial sectional view of a contact device according to the present invention, FIG. 2 is a sectional view taken along the line of FIG. 1, FIG. 3 is a plan view of the support plate, FIG. 4 is a bottom view, and FIG. , FIG. 4 is a line sectional view, FIGS. 6 to 8 are plan views of the conductive ring, FIG. 9 is a line sectional view of FIG. 7, and FIGS. 10 and 12 are plane views showing the contact plate. Figure 11 is a sectional view taken along the line of Figure 10.
3 is a sectional view taken along the line of FIG. 12, FIG. 14 is a side view showing an example of a truck crane, and FIG. 15 is a perspective view showing a conventional example of a contact device. 20...Contact device, 21...Lower inner cylinder, 22...
...Lower outer cylinder, 23, 28...Bearing, 24...
... Support plate, 25 ... Upper inner cylinder, 27 ... Upper outer cylinder, 33 ... Cylindrical part, 34 ... Flange part, 34
a... Surface of flange part, 39... Conductive ring,
39a...Surface of conductive ring, 41...Strut, 4
2...Bracket, 43...Contact plate, 45...Arm portion, 46...Contact body.

Claims (1)

[Claims] 1. A lower inner cylinder and an upper inner cylinder coaxially arranged at a predetermined interval, a cylindrical part and a flange part extending around the outer periphery thereof, and a predetermined number of the cylinders are stacked, a support plate arranged between the lower inner cylinder and the upper inner cylinder so as to be integrated with both; a plurality of annular conductive rings arranged concentrically on the flange surface of each support plate; and a lower part. A lower outer cylinder and an upper outer cylinder rotatably arranged on the outer peripheries of the inner cylinder and the upper inner cylinder via bearings, a plurality of struts bridged between the lower outer cylinder and the upper outer cylinder, and a stacked state. A predetermined number of brackets are disposed in a space formed between opposing flanges of the support plate, supported by each support, and a hemispherical contact body at the tip of a pair of arms.
A predetermined number of contact plates each supported by each bracket in such a manner as to be in contact with the surface of the corresponding conductive ring among the plurality of conductive rings arranged on the support plate flange portion, A contact device characterized in that the surface is curved and has a pear-shaped surface, and the pear-shaped surface is impregnated with a conductive lubricant.