JP4352574B2 - Cooling device for camera unit for weld visualization device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cooling device for cooling a camera unit of a welded portion visualization device used for observing a welded portion during laser welding work, and in particular, the cooling efficiency can be dramatically improved as compared with the prior art. The present invention relates to a cooling device for a camera unit for a welded portion visualization device.
[0002]
[Prior art]
At the time of welding work, observation of the welded portion (melted portion) is important for the management and stabilization of the welding quality.
[0003]
Conventionally, this type of welded portion has been observed by relying on the light emission of the welded portion, and thus, for example, it is possible for a welded portion in TIG welding or the like, but in a welded portion in laser welding (YAG), the welded portion has high brightness. Since the plasma light and the laser scattered light are emitted more intensely than the surroundings, the plasma light and the laser scattered light are stronger than the light emitted from the welded part. Luminescence was buried and observation of the weld was extremely difficult.
[0004]
For this reason, in recent years, as one of the methods for observing a welded part during laser welding work, a short pulse laser with higher brightness than the plasma light and laser scattered light of the welded part toward the welded part by laser welding. There has been proposed a weld visualization device that can be visualized by irradiating light and photographing the welded portion irradiated with the short pulse laser beam with a camera unit including a CCD camera. Yes.
[0005]
A camera unit I used in this kind of welded portion visualizing apparatus has a CCD camera 2 housed forward inside a cylindrical holder 1 whose rear end is closed, as schematically shown in FIG. A required number of optical components 3 and 4 such as two optical filters are installed and observed inside the front end of the holder 1 which is fixed at the center position and is in front of the CCD camera 2. The light incident on the CCD camera 2 from the power welded portion can be adjusted by the optical components 3 and 4 so as to be in a desired state, for example, by reducing the amount of light or limiting the wavelength. It is like that.
[0006]
By the way, the camera unit I of the welded portion visualizing device is to be faced to the welded portion during use, and is heated by radiation energy and reflected energy radiated from the welded portion. A cooling water passage 5 extending in the circumferential direction and the longitudinal direction is formed in the middle portion in the thickness direction of the side wall, and a cooling water supply line 7 for guiding cooling water 6 to the cooling water passage 5 from a cooling water supply portion (not shown). And a cooling water discharge line 8 are connected to each other from the rear end side of the holder 1, and the cooling water 6 guided through the cooling water supply line 7 is supplied to the cooling water of the holder 1. By flowing through the passage 5, the holder 1 is cooled, whereby the CCD camera 2 and the optical components 3 and 4 in the holder 1 can be indirectly cooled by heat conduction. It is Kill way. Reference numeral 9 denotes cables such as a power supply cable and an output cable that penetrate the rear end of the holder 1 in order to connect the CCD camera 2 to the outside.
[0007]
[Problems to be solved by the invention]
However, since the conventional cooling device for the camera unit I only indirectly cools the inside of the holder 1 with the cooling water 6, the cooling efficiency is not so high, and the internal temperature of the camera unit I during the laser welding operation is not high. If the internal temperature of the camera unit I rises, the optical components 3 and 4 may be damaged, and the CCD camera 2 may depart from the allowable operating temperature range. Therefore, the actual situation is that the weld visualization device cannot be used continuously for a long time.
[0008]
Therefore, the present invention is intended to provide a camera unit cooling device for a welded portion visualization device that can efficiently cool the inside of the camera unit.
[0009]
[Means for Solving the Problems]
In order to solve the above problems, the present invention includes a CCD camera at the axial center position in the holder, and a plurality of optical components so as to partition the inner space of the holder inside the front end of the holder , Cooling of a camera unit for a welded portion visualization device in which light incident on a CCD camera from a welded portion to be observed can be adjusted by the optical component and the holder is cooled by cooling water. In the apparatus, a required space is formed between the outer surface of the CCD camera in the holder and the inner surface of the holder so that the CCD camera is fixedly supported by the holder via a support member . A gas inlet for connecting a gas line for introducing a purge gas is provided at the rear end, and the front end of the holder is positioned at the required position of the front and rear of the optical component corresponding to each optical component. Takes the gas passage for communicating the interior space of the holder, be provided so as to connect the inner space of the holder in series, the purge gas introduced into the holder from the gas inlet through the space, the gas passage, After the internal space of the holder is circulated sequentially , it can be discharged to the outside.
[0010]
When purge gas is blown into the holder from the gas inlet when using the weld visualization device, the purge gas blown into the holder from the gas inlet is brought into contact with the surface of the CCD camera while passing through the space. Then, after being brought into contact with the surface of the optical component and then discharged to the outside through the front end opening of the holder, the CCD camera and the optical component are directly cooled by the flowing purge gas. .
[0011]
Further, by the structure where the is that gas communication path arranged to connect the inner space of the holder in series to correspond to the optical component adjacent to the front-rear direction and arranged at a position in the circumferential direction 180 degrees, the gas passage Since the purge gas directed to the next gas passage can be circulated between adjacent optical components in the direction of 180 degrees in the circumferential direction, the purge gas can be uniformly brought into contact with the surface of the optical component. The cooling efficiency can be increased.
[0012]
Furthermore, the support member for fixing and supporting the CCD camera to the holder is configured as a rectifying plate extending intermittently or continuously in the spiral direction, thereby rectifying the flow direction of the purge gas flowing through the outer space of the CCD camera. Since the plate can be spiraled, the entire outer peripheral surface of the CCD camera can be brought into contact with the purge gas evenly, and the cooling efficiency of the CCD camera can be increased.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0014]
FIGS. 1A and 1B show an embodiment of a camera unit cooling device for a welded portion visualizing device according to the present invention. Like the one shown in FIG. In the configuration in which the optical components 3 and 4 are installed on the front side of the CCD camera 2 and the holder 1 is cooled by the cooling water 6, the space between the holder 1 and the CCD camera 2 is as follows. In order to form a space 10 having a required size, the inner diameter of the holder 1 is made larger than the outer diameter of the CCD camera 2 to be accommodated, and the CCD camera 2 is held in the axial center of the holder 1. In order to achieve this, the CCD camera 2 is fixedly supported via a rod-shaped support member 11 at the axial center position near the rear end of the holder 1, and the inner peripheral surface of the holder 1 and the outer peripheral surface of the CCD camera 2 are And the inner surface of the rear end of the holder 1 and CC A space 10 having a required size is formed between the rear end surface of the camera 2 and a gas inlet 12 communicating with the space 10 is provided at the rear end of the holder 1. A purge gas supply unit (not shown) is connected via a gas line 13, and further, a gas passage 14 that bypasses from the rear side to the front side of the optical component 3 at one position on the inner wall of the holder 1 at the mounting position of the optical component 3. In addition, a gas passage 15 that bypasses from the rear side to the front side of the optical component 4 is provided in one place on the inner wall of the holder 1 at the mounting position of the optical component 4, and is led through the gas line 13 from the purge gas supply unit. The purge gas 16 is passed through the space 10 in the holder 1 from the gas inlet 12 through the rear side of the optical component 3, between the gas passage 14, between the optical components 3 and 4, and through the gas passage 15 in order, from the front end opening of the holder 1. Release to outside It can be so.
[0015]
The gas passages 14 and 15 are provided at a position of 180 degrees.
[0016]
The cooling water passage 5 provided in the side wall portion of the holder 1 may be the same as the conventional method shown in FIG. 3, but in the case of interference with the gas passages 14 and 15, it is shorter than that in FIG. Try to do this. Further, the penetration portion of the cables 9 at the rear end portion of the holder 1 can be hermetically sealed with a packing or the like (not shown). Other components that are the same as those shown in FIG.
[0017]
When the camera unit I is cooled by the cooling device, the cooling water 6 is circulated through the cooling water passage 5 as in the prior art, the inside of the holder 1 is indirectly cooled by the circulated cooling water 6, and the purge gas is supplied. The purge gas 16 guided from the gas passage 13 through the gas line 13 is blown into the holder 1 from the gas inlet 12 to cool the CCD camera 2 and the optical components 3 and 4. In this case, the purge gas 16 blown into the holder 1 first comes into contact with the surface of the CCD camera 2 when it is circulated in the space 10, and further passes through the gas passage 14 from the rear side of the optical component 3 and optically. Since it passes between the parts 3 and 4, passes through the gas passage 15 and is guided to the front side of the optical part 4, it comes into contact with the surfaces of the optical parts 3 and 4. And the front and rear sides of 4 can be directly cooled by the purge gas 16 in contact therewith.
[0018]
As described above, since the CCD camera 2 and the optical components 3 and 4 can be directly cooled by the purge gas 16, the thermal conductivity can be greatly increased, and indirect by the cooling water 6 as in the conventional case. Combined with cooling, the cooling efficiency can be dramatically improved. As a result, it is possible to eliminate the possibility that the optical parts 3 and 4 are damaged or that the CCD camera 2 is out of the allowable operating temperature range, and the welded portion visualization device is continuously used for a long time. It becomes possible. At this time, the gas passages 14 and 15 are arranged at a position of 180 degrees in the circumferential direction, so that the front surface of the optical component 3 and the rear surface of the optical component 4 are placed against the purge gas 16 flowing between the optical components 3 and 4. It can be made to contact reliably and the cooling efficiency of the optical components 3 and 4 can be improved. In the above, since the purge gas 16 is used as the cooling gas, no problem occurs even if it is blown out from the front end opening of the holder 1 toward the welded portion.
[0019]
Next, each of FIGS. 2 (a) and 2 (b) shows another embodiment of the present invention, and for the welded portion visualization apparatus having the same configuration as that shown in FIGS. 1 (a) and (b). In the cooling device of the camera unit, instead of making the support member 11 for fixing and supporting the CCD camera 2 inside the holder 1 in a rod shape, a plurality of rectifications extending intermittently in the spiral direction in FIG. A plate-like support member 17 is used, and in FIG. 2B, a rectifying plate-like support member 18 extending in series in the spiral direction is used.
[0020]
2A and 2B, the purge gas 16 blown into the holder 1 is spirally formed along the outer periphery of the CCD camera 2 by the support members 17 and 18 in either case of FIG. Since it is possible to flow, the entire outer peripheral surface of the CCD camera 2 can be brought into contact with the purge gas 16 evenly, and the cooling effect of the CCD camera 2 can be improved.
[0021]
In addition, this invention is not limited only to the said embodiment, In FIG. 1 (A) (B) and FIG. 2 (B) (B), the cooling device of this invention is made into two optical components 3. , 4 are used in the camera unit I provided in front of the CCD camera 2, but may be used in a camera unit having one optical component, or provided with three or more optical components. In this case, it is desirable that the gas passages provided on the inner peripheral surface of the holder 1 corresponding to the adjacent optical components are alternately arranged at 180 degrees in the circumferential direction, as shown in FIG. In (b) and (b), the support members 17 and 18 for fixing and supporting the CCD camera 2 in the holder 1 are shown as spiral plates, respectively. Apart from the same support member and the support member 11, an integer of purge gas 16 It may be provided a rectifying plate for performing other, it can of course be modified in various ways without departing from the gist of the present invention.
[0022]
【The invention's effect】
As described above, according to the cooling device for a camera unit for a weld visualization device of the present invention, the CCD camera is provided at the axial center position in the holder, and the inner space of the holder is partitioned inside the front end of the holder. A plurality of optical components, the light incident on the CCD camera from the welded portion to be observed can be adjusted by the optical components, and the holder is cooled by cooling water. In a cooling device for a welding unit visualization device camera unit, a required space is formed between the outer surface of the CCD camera in the holder and the inner surface of the holder, and the CCD camera is mounted on the holder via a support member. together so as to fixedly supported, the rear end portion of the holder, a gas inlet for connecting the gas line for directing the purge gas is provided, and the front end portion a predetermined position of the holder, pieces Introducing a gas passage for communicating the interior space of the holder before and after, it includes so as to connect the inner space of the holder in series, into the holder from the gas inlet of the corresponding to the optical component optical component of The purged gas is allowed to flow through the space , the gas passage , and the inner space of the holder in order , and then discharged to the outside. In addition, the purge gas is blown from the gas inlet into the space in the holder to cool the CCD camera by contacting the CCD camera while flowing the purge gas through the space, and through the gas passage provided for each optical component. The optical components can be directly cooled by the purge gas in contact with the surface of the substrate, and the thermal conductivity can be greatly increased. The cooling efficiency can be drastically improved compared to the conventional case, and the possibility of problems such as damage to optical components and the CCD camera moving away from the allowable operating temperature range can be eliminated. It exhibits an excellent effect that it is possible to continuously use over the device prolonged, also that provided so as to correspond to the optical component adjacent to the front-rear direction to connect the inner space of the holder in series gas the passing path, with the structure arranged in the position in the circumferential direction 180 degrees, that the gas passages purge gas towards the next gas passage, can be circulated in the direction of the circumferential direction by 180 degrees between adjacent optical components from it can be contacted uniformly purge gas to the surface of the optical component, it is possible to enhance the cooling efficiency of the optical component, further, a supporting member for fixedly supporting the CCD camera to the holder, helical direction With a structure in which the intermittent or continuous extending rectifier plate countercurrent, to be able to rectify the flow direction of the purge gas flowing through the space in the outer peripheral side of the CCD camera by the rectifying plate, the entire outer peripheral surface of the CCD camera Can be uniformly contacted with the purge gas, and the cooling efficiency of the CCD camera can be enhanced.
[Brief description of the drawings]
1A and 1B show an embodiment of a cooling device for a camera unit for a weld visualization device according to the present invention, in which FIG. 1A is a schematic side view, and FIG. FIG.
FIGS. 2A and 2B show another embodiment of the present invention, in which FIG. 2A is a schematic cut side view showing a rectifying plate extending in a spiral direction and (B) is a support member. It is a general | schematic cutting side view which shows what made the shape of the baffle plate continuously extended in a spiral direction.
FIG. 3 is a schematic cut side view showing a conventional camera unit for a weld visualization device.
[Explanation of symbols]
I Camera unit 1 Holder 2 CCD camera 3 Optical component 4 Optical component
6 Cooling water 10 space
11 Support member 12 Gas inlet 13 Gas line 14 Gas passage 15 Gas passage 16 Purge gas 17 Support member (rectifying plate)
18 Support member (rectifier plate)

Claims (3)

Light that is incident on the CCD camera from the welded portion to be observed, having a CCD camera at the axial center of the holder, and a plurality of optical components inside the front end of the holder so as to partition the internal space of the holder. Can be adjusted by the optical component and the holder is cooled by cooling water in a camera unit cooling unit for a welded portion visualization device, wherein the outer surface of the CCD camera in the holder is A required space is formed between the inner surface of the holder so that the CCD camera is fixedly supported by the holder via a support member, and a gas line for introducing purge gas to the rear end of the holder a gas inlet for connecting provided to and on the front end portion a predetermined position of the holder, communicating the interior space of the holder before and after the optical component corresponding to the individual optical components The fit of the gas passage, it includes so as to connect the inner space of the holder in series, the purge gas introduced into the holder from the gas inlet through the space, the gas passage, the inner space of the holder is sequentially circulated A cooling device for a camera unit for a welded portion visualizing device, characterized in that it has a configuration that can be discharged to the outside. The gas communication path that is provided so as to correspond to the optical component connects the inner space of the holder in series adjacent to the front-rear direction, claim disposed in position in the circumferential direction 180 degrees 1 weld visualization device for camera according Unit cooling device. A support member for fixedly supporting the CCD camera to the holder, extending intermittently or continuously in a helical direction the current plate and claims 1 or 2 weld cooling system of the camera unit for visualizing device according.

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