JP2801972B2 - Signal transmission equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a signal transmission device, and more particularly to a signal transmission device for transmitting a signal between a rotating part and a fixed part.

[0002]

2. Description of the Related Art Conventionally, for transmitting signals between a rotating part and a fixed part, there is a method of transmitting and receiving signals using a transmitting antenna and a receiving antenna.

[0003]

However, this method has a problem in that accurate signal transmission is required, since it cannot be avoided that external noise is mixed in or becomes a noise source. An object of the present invention is to provide a signal transmission device in which no external noise is mixed in signal transmission between a rotating part and a fixed part, and the antenna itself does not become a noise source to the outside.

[0004]

According to the present invention having the above-mentioned object, a plurality of pairs of ring-shaped conductors from which lead wires are drawn are provided at predetermined intervals in a plurality of ring-shaped hollow chambers provided in an electromagnetic shield. The ring-shaped conductor on either side was provided so as to be rotatable in the circumferential direction around the axis.

According to another aspect of the present invention, there is provided a rotating shaft, a first electromagnetic shield attached to the rotating shaft, and interlockingly rotating about a center of the rotating shaft, and a first electromagnetic shield. Forming an electromagnetic shield having a plurality of hollow chambers by combining, and a second electromagnetic shield that does not rotate in conjunction with the rotation axis, and a plurality of ring-shaped conductors, A first conductor group provided in the electromagnetic shield body and provided so as to rotate in association with the center of the rotation axis as a rotation center; A plurality of second conductor groups which are provided in a shield, are coaxially opposed to the first conductor group at a predetermined interval from each other, and do not rotate in conjunction with the rotation axis; Contact the first conductor of The first electromagnetic shield is insulated from the first electromagnetic shield, and sends a signal to the plurality of first conductors from a rotating part interlocked with the rotation axis, or the rotation from the plurality of first conductors is performed. A plurality of first conductors for sending a signal to a portion; and a plurality of second conductors connected to the plurality of second conductors;
Insulated from the plurality of second electromagnetic shields, and
A plurality of first parts are fixed from a fixed portion that does not rotate in conjunction with the rotation axis.
And a plurality of second conductors for sending a signal to the conductor of the second member or a signal from the plurality of second conductors to the fixed portion.

[0006]

According to the first aspect of the present invention, the antenna surfaces of the plurality of ring-shaped conductor groups from which the conductors are drawn out have the same ring shape, and their axes coincide with each other. Also, both are arranged facing each other at a predetermined interval. The three sets of ring-shaped conductors are electromagnetically shielded by an electromagnetic shield. One or both of the opposed ring-shaped conductors are rotated, and a signal is transmitted from one to the other via a conductor. In this case, the antenna surfaces face each other, and the shape of the antenna surface does not change even when rotated. It is also electromagnetically shielded. Therefore, it is possible to perform good signal transmission without becoming a noise source to the outside without mixing of noise from the outside.

Further, the arrangement of the two sets of ring-shaped conductor groups may be arranged so as to overlap at predetermined axial intervals.

[0008]

FIG. 1 is a diagram illustrating the principle of the present invention. In FIG. 1, a signal transmission device 100 includes a pair of ring-shaped conductor groups (101, 104, 105) (102, 1
04, 105) are coaxially opposed to each other at a predetermined interval, and one of the ring-shaped conductors is provided so as to be rotatable in the circumferential direction around the axis.

Next, a preferred embodiment of the present invention will be described with reference to the drawings. Next, the configuration of a rotary tube inspection machine using the signal transmission device according to the present invention is shown in FIG.
This will be described with reference to FIGS. The rotary tube inspection machine 2 includes a base 35, a motor 36, a rotation shaft 37, a rotation inspection table 12, a cam 46, a cam follower 47, a holder elevating rotation shaft 48, a centering jig 38, In-tube inspection device 39 and camera selector 4
3, a mixer 44, and an antenna unit 4 as a signal transmission device
5, a rotary resolver 49, a fixed resolver 50, a light amount checker 51, a cam positioner 87, and discriminating devices (video image checkers) 90A and 90B.

A fixed shaft (not shown) is provided on the base 35, and a tubular rotary shaft 37 is provided so as to share an axis with the fixed shaft and to cover the fixed shaft. The rotating shaft 37 is configured to be driven to rotate by a motor 36. In addition, a rotary resolver 49 and a fixed resolver 50 are provided to measure the angular position between the fixed shaft and the rotating shaft 37. The rotation inspection table 12 is connected to a rotation shaft 37,
It rotates with the rotation of 7. A holder H can be placed on the rotation inspection table 12. The holder H is moved up and down and rotated by a holder elevating rotary shaft 48. The elevating operation of the holder elevating rotary shaft 48 is performed by a cam 46 and a cam follower 47 provided at the lower end of the holder elevating rotary shaft 48. The squeeze port side of the laminate tube T can be inserted into the holder H. A centering jig 38 for holding the tail side of the laminate tube T in a circular shape is supported above the holder H. In-tube inspection device 39 for inspecting the inside of laminate tube T
Is a tube insertion section 40, a borescope 41, and C
And a CD camera 42. Borescope 41
Includes a borescope main body 52 and a borescope insertion section 53. The tube insertion section 40 includes a borescope insertion section 53, a light emitting diode section 54, and a photo sensor section 55. Of these, the borescope insertion portion 53 mainly inspects the inner bottom surface side of the laminate tube T in the drawing, that is, the squeeze port side, and
The photo sensor unit 55 mainly inspects the inner surface of the laminate tube T.

Next, the operation of the rotary tube inspection machine will be described with reference to FIGS. In FIG. 2, a laminate tube T is placed on a holder H and transported to a star wheel 11 by a transport conveyor 9 or the like. The star wheel 11 takes the laminated tube T together with the holder H onto the rotary inspection table 12 of the rotary tube inspection machine 2. After being taken on the rotating rotary inspection table 12, the holder H moves up and down according to the cam curve of the cam 46 as the holder elevating rotary shaft 48 moves up and down, and intermittently rotates around the axis of the holder elevating rotary shaft 48. I do. That is, as shown in FIG. 3, performs the rotation at the inspection position while revolving in the direction of rotation of the rotating inspection table 12, the rotation in terms of drawing _{P 1, P 2, P 3} , P 4 when the Pause for a predetermined time. The laminate tube T is also raised by raising the holder H, and the tube insertion portion 40 of the in-tube inspection device 39 is inserted into the inside of the tube held in a circular shape by the centering jig 38. As described above, in a state where the in-tube insertion portion 40 is inserted into the tube, the laminate tube T intermittently rotates between the points P _{1 to} P ₄ , thereby using the in-tube inspection device 39. Inspection of the inner bottom surface and inner surface of the tube can be performed in the section. This intermittent rotation corresponds to a relative planar movement between the cylindrical body and the imaging means. 1
When the inspection is completed for one of the tubes, the defective laminate tube T is discharged. Further, before the insertion portion 40 in the tube is inserted into the inside of the laminate tube T, the light amount of the light emitting portion is checked by the light amount checker 51, and the result is reflected at the time of data processing. Further, when the light amount is equal to or less than the reference value, an alarm can be issued to replace parts.

Next, a more detailed configuration of the insertion portion in the tube will be described with reference to FIGS. FIG. 9 (A)
3 shows a cross section in the II direction of the in-tube insertion portion 40 inserted into the laminate tube T. FIG. 9C is a cross-sectional view in the II-II direction, and FIG.
It is sectional drawing of the I direction.

The insertion section 40 in the tube is a borescope 4
1 includes a light emitting diode unit 54, a joint fitting 56 and a bolt 5;
7, the light emitting diode unit 54 and the photo sensors 55a, 55b, 55c, 55d, 55e, 5
5f is attached. Borescope insertion part 53
Is shown in FIG. 9B. Borescope insertion part 53
Is provided with a lens unit 60 for capturing an image inside a stainless steel tube 58, and a light source fiber unit 59 including a thin glass fiber provided around the lens unit 60. In the figure, the end surface S of the borescope insertion portion 53 is perpendicular to the axis of the borescope insertion portion 53, but it may be cut obliquely so as to have a certain angle with respect to the axis. In this case, the field of view is expanded not only vertically downward but also obliquely. Further, the borescope insertion portion 53 is eccentric from the axis of the laminate tube T, and the positional relationship is shown in FIGS. 8A and 8C. That is, the inspection area F ₁ of the bore scope insertion portion 53 in this case is 4 minutes circular portion excluding the square of the camera field mask portion (hatched portion). Laminate tube T, the point P ₁ performs intermittently rotation motion as shown in FIG. 3,
Since the inspection is temporarily stopped at P ₂ , P ₃ , and P ₄ , the inspection area F ₁ in FIG. 8C can be inspected when the point P ₁ stops, and the inspection area F ₂ can be inspected when the point P ₂ stops. Can be inspected. Hereinafter, an inspection region F ₃ when it stops the point P ₃ in the same manner, the inspection area F ₄ when the stop point P _4, may be respectively examined. As described above, by dividing the inspection area as shown in FIGS. 8A and 8C and approaching the inner bottom surface to perform imaging and inspection,
As shown in FIGS. 8B and 8D, the resolution can be further improved and finer than in the case where the borescope insertion portion 53 is set as one inspection area at the axis of the laminate tube T. Defects such as contaminants and scratches can be detected. The division of the inspection area is not limited to four divisions, and may be another number.

On the other hand, the light emitting diode unit 54
Cover from the inner bottom surface of the toe tube T to the upper opening surface
It has a length and can illuminate the inner surface from top to bottom.
Can be. Each of the photo sensors 55a to 55f has a light emitting device.
Three parts are provided on both sides of the iodine part 54.
As shown in FIG. 9 (C), the inspection areas overlap.
It is provided in. With this configuration,
The photo sensors 55a to 55f are formed by a laminate tube T.
During the period of rotation, that is, the point P in FIG. ₁,
P_Two, P_Three, P_FourDuring the period except for the period suspended at,
The inner surface can be inspected. Here is the photo
The sensors 55a to 55f may be provided in one row,
Or, a photoelectric conversion element other than the photo sensor, for example, C
It may be a CD element or the like.

Next, processing of the inspection information detected by the in-tube inspection device 39 will be described. The image information of the inner bottom surface of the laminate tube T detected by the CCD camera 42 is converted into a video signal, and the inspection information of the inner surface of the laminate tube T detected by the photo sensor unit 55 is converted into a voice signal, and both are mixed. Is transmitted to the outside to determine whether or not a defect is present.

FIG. 10 is a block diagram showing the flow of image information processing on the inner bottom surface of the laminate tube T. FIG.
Are roughly divided into a rotating block 85 and a fixed block 86. The rotation block 85 includes twelve CCD cameras 42a-
42l, a VIDEO selector 43 for dividing the 12 CCD cameras into four groups for each of the three cameras, selecting one of the three cameras, and selecting the image information.
a, 43b, 43c and 43d. The image information selected by the VIDEO selectors 43a, 43b, 43c, 43d is converted by an RF converter, and the information is
It is amplified by the RF amplifiers 44e, 44f, 44g, 44h. RF amplifiers 44e, 44f, 44g, 44h
The signal amplified by Band Pass Fil
tor (bandpass filter) 44i, 44j, 44
k, 441 and then to a mixer 44 for mixing the signals selected from the four VIDEO selectors 43a, 43b, 43c, 43d. The signal output from the mixer 44 is sent to the antenna unit 46 through the BPF 95.

Referring to FIGS. 6 and 7, the antenna unit 46 includes a fixed part 110 and a rotating part 111. The rotating part 111 includes a hollow cylindrical part 111a and a disk part 111b. The fixing portion 110 has three concentric grooves 110.
A, 110B, and 110C, and the fixed part 110 and the rotating part 111 are overlapped to form one antenna. Fixed part 1
The structure in the groove 110A formed in the base 10 will be described as an example.
5 and is provided with a sliding portion 120 made of carbon tool steel or the like. Antenna units 112 and 113
Are in sliding contact with an external unit by lead wires 81 and 82. The antenna units 112 and 113 input and output signals via the BNC connector 117 and the lead wires 81 and 82. Similarly, two other grooves 110B and 110C are formed. The fixing portion is formed of Al (aluminum) or the like for performing electromagnetic shielding.

As described above, the 1 formed on the fixing portion 110
In three grooves 10A, 110B and 110C, groove 1
In 10B, grooves 110A and 110C transmit horizontal and vertical synchronizing signals from video image checker A 90A and video image checker B 90B to each CCD camera as described later, as antennas for transmitting a synchronizing signal from the fixed part to the rotating part. It is used as an antenna part for Since the antennas in the groove are electromagnetically shielded from each other, they do not give each other noise.

As described above, the signal transmission device includes three antenna sections each having a lead wire drawn out of the rotating section 110 as an electromagnetic shield. In FIG.
5A is a bottom view showing the antenna unit, and FIG. 5B is a plan view showing the fixing unit. Here, processing of the inspection information detected by the in-tube inspection device 39 will be described. The image information on the inner bottom surface of the laminate tube T from each of the CCD cameras 42a to 42l indicates the angular position of the rotary inspection table 12 detected by the rotary resolver 49 and the cam positioner 8
After receiving the information, the VIDEO selector 43 specifies a camera to which information is to be taken, and image information from the CCD camera is selected and taken in, and transmitted to the mixer 44. As apparent from FIG. 3, is when the laminate tube T has reached the point P ₄ is already the point P _3, the point P _2, since the subsequent laminating chew off T to the point P ₁ has reached the four simultaneously Image information from the camera is captured. Mixer 4
B.4 modulates and mixes these four pieces of image information with predetermined carrier waves, respectively. P. F. 95 to the transmitting antenna 46.

The image signal is sent to the groove 110B for accommodating the antenna section through the conducting wire 81, and is transmitted from the antenna section 112 to the antenna section 113. The signal received by the antenna unit 113 is sent to the distributor 88 via the conductor 82. The fixed block includes a distributor 88 for distributing the received image information to the four tuners, and the four RF converters 44a, 44b, 44c,
Tuner 89 corresponding to the frequency converted by 4d
a, 89b, 89c, 89d and memory units 20a, 20b, 20c, 20d, 2d for recording images reproduced by the four tuners 89a, 89b, 89c, 89d.
1a, 21b, 21c, and 21d.

The memory units 20a, 20b,
The image data is transmitted to video image checkers 90A and 90B that process the image data stored in 20c and 20d. The data processed by the video image checkers 90A and 90B is output as a determination output via an output amplifier. On the other hand, horizontal and vertical synchronizing signals are output from the video image checkers 90A and 90B, respectively,
2a, the signals from the signal amplifiers 92a and 92b are transmitted to the fixed units, respectively.
3a, 93b, 93c and 93d are transmitted and amplified.
Thereafter, the signals from the amplifiers 93a, 93b, 93c, and 93d are mixed by mixers 94a and 94b, and are mixed by the B.C. P. It is sent to the rotating part via the antenna part of the groove 110A, 110C via F. The signal received by the antenna unit of the rotating unit is distributed by the distributor 95 to two sets of AMPs on the receiving side. AMP96a, 96b, 9
The signals output from 6c and 96d are supplied to buffer 97 and buffer 9
8 to the CCD cameras 42a to 42l. This synchronization signal is transmitted together with the image from the CCD camera, and the image is identified by the synchronization signal.

The mixed image information received by the receiving antenna 75 is divided into frequency bands by a distributor 88 and sent to the tuners 89a to 89h to detect information signals. Among the tuners 89a to 89d, the tuner 89
a, 89b is a video image checker 9
Sent to 0A. The information signals from tuners 89c and 89d are sent to video image checker 90B.

On the other hand, if the image is not binarized by the video image checker 90A and a foreign substance, a flaw, dust or the like is not found, an OK signal is output, and if they are found, an NG signal is output to the output amplifier 91. The amplified signal is output as a determination output. The antenna section 46 has a transmitting antenna and a receiving antenna, an electromagnetic shielding cover for electromagnetically shielding these, an electromagnetic shielding cover, a mounting bracket for each antenna, and lead wires 81 and 82 for supplying signals. . The transmitting antenna 74 and the receiving antenna 75 are in a non-contact state and always face each other even when the rotating block rotates, so that information signals can be stably transmitted and received. I will not receive it. Also, it does not become a noise source to the outside.

In the above embodiment, the transmission antenna and the reception antenna, which are ring-shaped conductors, have been described as being ring-shaped, but may be ring-shaped. Alternatively, the shape may be a disk or a straight line. Furthermore, it may be a double ring shape that overlaps in the radial direction.

[0025]

As described above, according to the present invention,
Signals can be transmitted and received between the rotating part and the fixed part using a non-contact antenna, and signal transmission can be performed without causing noise from outside. Accuracy can be improved.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating the principle of the present invention.

FIG. 2 is a configuration diagram of a tube inspection system using a rotary tube inspection machine using an antenna unit of the present invention.

FIG. 3 is an operation explanatory view of a rotary tube inspection machine using the antenna unit of the present invention.

FIG. 4 is a configuration diagram of a rotary tube inspection machine using the antenna unit of the present invention.

FIG. 5 is a plan view and a bottom view of the antenna unit of the present invention.

FIG. 6 is a sectional view of an antenna unit according to the present invention.

FIG. 7 is an enlarged sectional view of the antenna unit of the present invention.

FIG. 8 is an explanatory diagram illustrating a camera field of view of an insertion portion in a tube.

FIG. 9 is a cross-sectional view of a tube insertion portion inserted into a laminate tube T.

FIG. 10 is a block diagram of a rotary tube inspection machine provided with an antenna unit.

[Explanation of symbols]

 46 antenna unit 110 fixing part 110A, 110B, 110C groove 111 rotating part 111a cylindrical part 111b disk part 112, 113 antenna part 114, 115 base

Claims (6)

(57) [Claims] 1. A plurality of ring-shaped conductors, from which lead wires are drawn, are concentrically opposed to each other at predetermined intervals in a plurality of ring-shaped hollow chambers provided in an electromagnetic shield. A signal transmission device, wherein one ring-shaped conductor is provided so as to be rotatable in a circumferential direction about the axis. 2. The signal transmission device according to claim 1, wherein
The signal transmission device, wherein the two pairs of the plurality of ring-shaped conductors have substantially the same diameter as each other, and are arranged facing each other at a predetermined interval in the axial direction. 3. The signal transmission device according to claim 1, wherein
2. The signal transmission device according to claim 1, wherein the pair of two ring-shaped conductors have different diameters from each other, and are arranged at predetermined intervals in a radial direction. 4. The signal transmission device according to claim 1, wherein
The signal transmission device, wherein the ring-shaped conductor has an annular plate shape. 5. The signal transmission device according to claim 1, wherein
The signal transmission device, wherein the ring-shaped conductor has an annular shape. 6. A plurality of hollows formed by combining the rotating shaft, a first electromagnetic shield attached to the rotating shaft, and interlockingly rotating around the center of the rotating shaft, and the first electromagnetic shield. Forming an electromagnetic shield having a chamber, and a second electromagnetic shield that does not rotate in conjunction with the rotation axis, a plurality of ring-shaped conductors, provided in the electromagnetic shield of a plurality of hollow chambers, A first conductor group provided so as to rotate in conjunction with the center of the rotation axis as a rotation center, and a plurality of ring-shaped conductors provided in the electromagnetic shield of the plurality of hollow chambers; A plurality of second conductor groups which are coaxially opposed to the first conductor group at a predetermined distance from each other and do not rotate in conjunction with the rotation axis; and a plurality of the first conductor groups. Connected to the first electromagnetic For transmitting a signal to the plurality of first conductors from a rotating portion that is insulated from the shield body and interlocking with the rotation axis, or for sending a signal from the plurality of first conductors to the rotating portion. A plurality of first conductors are connected to the plurality of second conductor groups, the plurality of second electromagnetic shields are insulated from each other, and a plurality of fixed portions that do not rotate in conjunction with the rotating shaft from a plurality of fixed portions. A plurality of second conductors for transmitting a signal to a first conductor or transmitting a signal from a plurality of second conductors to the fixed portion.