JP2971598B2 - 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,
The present invention relates 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. SUMMARY OF THE INVENTION An object of the present invention is to provide a signal transmission between a rotating part and a fixed part, which has a good shielding property and a good slidability, does not cause external noise and does not become a noise source to the outside. A transmission device is provided.

[0004]

A plurality of pairs of ring-shaped conductors each having a fixed portion formed of an electromagnetic shielding material and a rotating portion, and having a plurality of ring-shaped hollow chambers, each having a lead wire drawn out, are disposed at a predetermined distance from each other. Are placed concentrically facing each other, a ring-shaped conductor on one of the other sides is provided rotatably about the axis, and a sliding member for maintaining electromagnetic shielding properties is used for the sliding portion. .

[0005]

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 the electromagnetic shield 103. One or both of the opposed ring-shaped conductors are rotated to transmit a signal 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.

Further, a sliding member is used for the fixed portion and the sliding portion. Because of the electromagnetic shielding, it is possible to perform good signal transmission without noise from outside.

[0007]

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, the configuration of a rotary tube inspection machine using the signal transmission device according to the present invention will be described with reference to FIGS. 2, 3 and 4. The rotary tube inspection machine 2 includes a base 35, a motor 36, a rotating shaft 3
7, the rotation inspection table 12, the cam 46, the cam follower 4
7, holder elevating rotary shaft 48, centering jig 3
8, the in-tube inspection device 39, the camera selector 43
, A mixer 44, and an antenna unit 45 as a signal transmission device
, A rotary resolver 49, a fixed resolver 50, a light amount checker 51 (FIG. 2), a cam positioner 87, and a discriminating device (video image checker) 84.

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 for measuring the angular position between the fixed axis and the rotary axis. The rotation inspection table 12 is connected to a rotation shaft 37 and rotates with the rotation of the rotation shaft 37. 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.
Are supported above the holder H. The in-tube inspection device 39 for inspecting the inside of the laminate tube T has an in-tube insertion section 40, a borescope 41, and a CCD camera 42. The borescope 41 includes a borescope main body 52 and a borescope insertion section 53. The insertion portion 40 in the tube is a borescope insertion portion 53.
Light emitting diode unit 54, photo sensor unit 55,
Contains. Of these, the borescope insertion section 53 mainly inspects the inner bottom side of the laminate tube T in the drawing, that is, the squeeze port side, and the light emitting diode section 54 and the photo sensor section 55 mainly inspect the inner side 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, the rotation is performed at the inspection position while revolving in the rotation direction of the rotation inspection table 12, and at this time, the rotation is performed at points P ₁ , P ₂ , P ₃ , and P _{4 in} the figure. Pause for a predetermined time. The laminate tube T is also raised by the raising of the holder H, and the in-tube insertion portion 40 of the in-tube inspection device 39 is inserted into the inside of the tube held by the centering jig 38 in a circular shape. 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 bottom surface inside the tube and the inside 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.
When the inspection is completed for one tube, 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, although the borescope insertion portion 53 is eccentric from the axis of the laminate tube T, the positional relationship is shown in FIGS. 8 (A) and 8 (C). 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 as compared with the case where the borescope insertion section 53 is set as one inspection area at the axis of the laminate tube T, and finer and finer. 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 portion 54 has a length covering the inner bottom surface to the upper opening surface of the laminate tube T, and can illuminate the inner surface from the upper end to the lower end. Each of the photosensors 55a to 55f is provided three on each side of the light emitting diode unit 54, and is provided so that the inspection areas overlap as shown in FIG. 9C. With this configuration, the photosensor 55A～55f, period laminate tube T is rotating, i.e. the point P _1, P ₂ in FIG. 3,
The inner surface can be inspected during the period except for the period stopped at P ₃ and P ₄ . Here, the photo sensors 55a to 55f may be provided in one row, or
A photoelectric conversion element other than the photo sensor, for example, a CCD element or the like may be used.

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
The signals via h, 441 are then sent to a mixer 44 which mixes the signals selected from the four VIDEO selectors 43a, 43b, 43c, 43d. Mixer 4
The signal output from 4 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 has a hollow cylindrical part 111a and a disk part 111b. The fixing portion 110 has three concentric grooves 110A,
It has 110B and 110C, and the fixed part 110 and the rotating part are overlapped to form an antenna. Describing the structure inside the groove 110A formed in the fixing part 110 as an example, the antenna parts 112 and 113 are connected to the insulators 114 and 115. The antenna portions 112 and 113 are connected to the lead wire 81,
82 connects to an external unit. The antenna units 112 and 113 input and output signals via the BNC connector 117 and the leads 81 and 82. Similarly two other
Two grooves 110B and 110C are formed. The fixing portion is formed of Al (aluminum) or the like for performing electromagnetic shielding. The sliding contact portion 120 is made of a conductive resin: a conductive nylon material (for example, a conductive MC nylon (Nippon Polypenco Co., Ltd.)) and a sliding portion 120A provided above the rotating portion and a sliding member formed of a steel plate. And the moving part 120B.
0A, 110B and 110C, the groove 11
At 0A, the grooves 110B and 110C are used as antennas for transmitting image signals from the fixed unit to the rotating unit. The grooves 110B and 110C are used to transmit horizontal and vertical synchronization signals from the video image checkers A90A and B90B to the respective CCD cameras. Used as an antenna unit. Since the antennas in the groove are electromagnetically shielded from each other, they do not receive noise from each other.

As described above, the signal transmission device includes three antenna sections each having a lead wire drawn out in the rotating section 110 as an electromagnetic shield. In FIG.
FIG. 5A is a bottom view showing a rotating unit, and FIG. 5B is a plan view showing a fixing unit. Further, an elastic member 130 is provided above the rotating part 111 to press the rotating part 111 against the fixed part 110 so that the rotating part 111 and the fixed part 110 are in close contact with each other to improve the shielding property. As a result, when the rotating unit 111 rotates, the fixed unit 110 and the rotating unit 1 are rotated.
11 are in sliding contact with each other while being shielded by the sliding portion 120, and maintain good shielding properties and slidability.

Here, the 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 from each of the CCD cameras 42a to 42l specifies the camera 43 to take in the information from the angular position of the rotary inspection table 12 detected by the rotary resolver 49, and selects image information from the camera. Take in,
The signal is transmitted to the mixer 44. As apparent from FIG 2, when a laminate tube T has reached the point P ₄ is already the point P _3, the point P _2, subsequent laminated tubes T to the point P ₁
, The image information from the four cameras is taken in at the same time. The mixer 44 modulates and mixes these four pieces of image information with predetermined carrier waves, respectively. P.
F. 95 to the transmitting antenna 46.

The wire is sent to the groove 110A for accommodating the antenna section through the conducting wire 81, and is sent from the antenna section 112 to the antenna section 1
13 is transmitted. 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 that distributes the received image information to the four tuners, and tuners 89a and 89 corresponding to the frequencies converted from the distributor 88 by the four RF converters 44a, 44b, 44c, and 44d.
b, 89c, 89d and the four tuners 89 described above.
memory units 20a, 20b, 20c, 20d, 21a for recording images reproduced by a, 89b, 89c, 89d,
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 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, as a result of binarization by the video image checker 90A, if no foreign matter, scratch, dust, etc. is 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 determination of good or bad is made, for example, by binarizing the image information signal based on brightness and determining the number of pixels in the dark area.

The antenna section 46 has a transmitting antenna and a receiving antenna, an electromagnetic shielding cover for electromagnetically shielding them, an electromagnetic shielding cover, a mounting bracket for each antenna, and lead wires 81 and 82 for supplying signals. doing. 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. It is not affected and 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,
Since the sliding member is used between the rotating part and the fixed part, it is possible to maintain a shielding property while the rotating part rotates, and also to maintain a good sliding property. Therefore, it is possible to perform signal transmission without external noise mixing, and it is possible to improve signal transmission accuracy because it does not become a source of external noise.

[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 a sectional view of an antenna unit according to 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]

 44 ... Mixer 46 ... Antenna unit 110 ... Fixed part 111 ... Rotating part 111a ... Cylinder part 111b ... Disc part 112,113 ... Antenna part 114,115 ... Gauge 117 ... BNC connector

Claims (3)

(57) [Claims] 1. A plurality of pairs of ring-shaped conductors each comprising a fixed portion and a rotating portion formed of an electromagnetic shielding material and having a plurality of ring-shaped hollow chambers and lead wires drawn out of the plurality of ring-shaped conductors are arranged concentrically at predetermined intervals. A ring-shaped conductor is provided so as to be rotatable about an axis, and a sliding portion between the fixed portion and the rotating portion is used to maintain electromagnetic shielding properties. A signal transmission device characterized in that: 2. The sliding member has a conductive resin on one side,
2. The other side is an iron sliding member.
The signal transmission device according to claim 1. 3. The signal transmission device according to claim 1, further comprising an elastic member that presses one of the rotating member and the fixed member against the other.