JPH0638628Y2 - Electron beam welding equipment for harmful materials - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an electron beam welding apparatus for harmful materials, which enables easy maintenance and inspection of an electron gun.

[Prior Art] As is well known, an electron beam has been conventionally utilized for welding various materials, and its general structure is shown in a perspective view of FIG.

The structure of the electron beam welding apparatus will be described below. Reference numeral (1) shown in the drawing is a vacuum chamber, and a material to be welded placed on the bottom of the vacuum chamber (1) for welding. A rotary table (1a) is provided for rotating the shaft around a vertical axis. An electron gun (2) having an evacuation device (3) is externally attached to one outer side surface of the vacuum chamber (1), and a duct is attached to the other outer side surface of the vacuum chamber (1). An evacuation device (4) for a vacuum chamber is provided therethrough. further,
The electron gun (2) is connected to a high voltage generator (5) for applying a high voltage for generating an electron beam to the electron gun (2) via a high voltage cable (6). Has become.

Therefore, there is no particular problem when welding ordinary metal materials and the like with the electron beam welding apparatus having the above-mentioned configuration, but for example, the material to be welded seals harmful substances such as radioactive substances. In this case, the entire electron beam welding apparatus is housed and welded inside a cell having a radiation shielding function.

Further, as shown in FIG. 5 of the configuration diagram, a vacuum chamber (1) that is evacuated by a vacuum exhaust device (3) is provided inside a cell (C) having a radiation shielding function,
There is also known an electron beam welding apparatus having a configuration in which a through hole through which an electron beam passes is provided in a radiation shielding wall of a cell (C), and an electron gun (2) is attached to a position corresponding to the through hole outside the radiation shielding wall. Has been.

[Problems to be solved by the device]

Each of the above-mentioned electron beam welding devices is useful as such, but from the viewpoint of the ease of maintenance and inspection of the welding device itself, it still has the problems described below.

That is, as is well known, the filament of an electron gun is consumed so much that it must be replaced frequently.

However, in the first conventional example, since a worker or the like cannot enter the inside of the cell, it is necessary to perform the filament replacement work by a manipulator or an automatic replacement device, which requires a large amount of capital investment. The electron gun may be damaged due to the interference of the work site, or the irradiation direction of the electron beam may be displaced due to the difficulty in positioning during attachment, and it is important to ensure the reliability of the electron gun after maintenance. Welding equipment maintenance and
The inspection required a great deal of labor.

Furthermore, when part of the electron gun needs to be taken out of the cell for maintenance and inspection, decontamination work such as water cleaning and chemical cleaning is indispensable.・ Many liquid wastes will be generated for management.

Further, even in the second conventional example, there is leakage of the radiation from the through hole provided in the radiation shielding wall of the cell, and the radiation flies near the electron gun, so that the danger is avoided as in the first conventional example. Therefore, the work must be done by using a manipulator or the like, and although it is said to be improved as compared with the first embodiment, it is not preferable for the efficiency and economical efficiency of the maintenance / inspection work.

Therefore, an object of the present invention is to provide an electron beam welding apparatus for harmful materials, which allows an operator or the like to easily replace an apparatus such as an electron gun.

[Means for Solving the Problems]

The present invention has been made in view of the above problems,
Therefore, in the construction of the electron beam welding apparatus for harmful materials according to the present invention, a vacuum chamber for accommodating the object to be welded is provided in the inside of the cell having the opening for sealing the harmful material in the harmful material isolation wall. An isolation chamber is formed by a hazardous substance isolation wall including an opening and an isolation wall having a hazardous substance sealing function provided inside the cell, and an electron gun is provided on the isolation chamber side of the isolation wall and an electron of the electron gun. The beam outlet side and the vacuum chamber are communicated with each other via a shutter device.

[Action]

According to the electron beam welding apparatus for harmful materials of the present invention,
Hazardous substance isolation wall including the opening is provided in the cell having the opening for sealing the harmful substance in the cell, and the harmful substance is provided inside the cell. An isolation chamber is formed by the isolation wall having a sealing function, an electron gun is provided on the isolation chamber side of the isolation wall, and the electron beam outlet side of the electron gun and the vacuum chamber are communicated via a shutter device. Since it is configured as follows, harmful substances inside the cell are sealed by the main body of the shutter device,
Hazardous substances inside the vacuum chamber are sealed by closing the shutter device.

On the other hand, since the electron beam can be passed by opening the shutter device, there is no problem in welding the harmful material, and the harmful material is isolated by the isolation wall of the cell during the welding.

〔Example〕

An embodiment according to the present invention will be described below with reference to FIG. 1 which is a schematic sectional view, FIG. 2 which is an explanatory sectional view of a shutter device, and FIG. 3 which is a sectional view taken along line III-III of FIG. The same parts as in the prior art will be described below with the same reference numerals and radioactive substances will be taken as an example of harmful substances.

That is, reference numeral (C) shown in FIG. 1 is a cell formed by a radiation shielding wall, and inside the cell (C),
The inside is degassed by an exhaust device (4) for a vacuum chamber, which is connected to one end on the outside of a duct that penetrates the side wall, and the inside contains a container for sealing a radioactive material or a radioactive material as a material to be welded. A vacuum chamber (1) is provided.

On the other hand, an isolation chamber (r) surrounded by an isolation wall (w) having a radioactive substance sealing function is provided at one corner inside the cell (C), and an isolation chamber (r) located inside the cell (c) is provided. An electron gun (2) equipped with a vacuum exhaust device (3) is fixed to the isolation wall (w) of FIG. The electron gun (2) penetrates the isolation wall (w), and the vacuum chamber (1) is provided by an electron beam irradiation tube (7) in which a shutter device (10) having a structure described later is interposed. Is in communication with.

The electron gun (2) is connected to a high voltage generator (5) provided outside the cell (c) by a high voltage cable (6).

In addition, in the isolation wall (Wc) of the cell (c), the isolation chamber (r)
The opening, which is opened to the side and into which a door (d) having a radioactive substance sealing function that can be opened and closed is fitted, is a manikin (8) for taking out the electron gun (2) as necessary.

By the way, the details of the shutter device (10) described above are substantially the same as those of a normal on-off valve, as shown in FIG. 2 and FIG. A through hole (12a), which is rotated around an axis perpendicular to the axis, inside the shutter body (11) having entrances and exits opening in opposite directions, and which coincides with the entrance and exit by rotation.
A rotating body (12) as a shutter including the above is internally provided via a seal (s), and the rotating body (12) is fitted to a protruding end of the rotating shaft (13) from the shutter body (11). The cylinder is rotated by the expansion and contraction of the rod of the cylinder (15) through the combined opening and closing lever (14). That is,
Radiation is shielded by the rotating body (12), and the outflow of fine radioactive substances that may be suspended in the atmosphere is prevented by the seal.

Further, although the expansion and contraction operation of the rod of the cylinder (15) is omitted in the drawing, it goes without saying that the operation is performed by remote control.

Hereinafter, the use mode of the electron beam welding apparatus having the above-described configuration will be described. First, when welding a radioactive material,
The rod of the cylinder (15) is contracted by remote control, and the rotating body (12) through the opening / closing lever (14) has both openings of its through hole (12a) as shown in FIG. The shutter device (10) is opened by rotating the shutter device (10) to a position corresponding to the entrance / exit of (11).

Then, when a high voltage is applied to the electron gun (2) through the high voltage cable (6) by the high voltage generator (5),
An electron beam is generated from the electron gun (2), the beam reaches the vacuum chamber (1) through the electron beam irradiation tube (7), and the welding target material contained in the vacuum chamber (1) Irradiated to the welding site. During the irradiation with the electron beam, the radioactive substance in the cell (c) is shielded by the isolation wall (Wc) of the cell (c).

On the other hand, when the electron gun (2) is taken out of the cell (c) for maintenance and inspection, for example, to replace the filament, the shutter device (10) is closed.

Then, the radioactive substance that leaks into the isolation chamber (r) through the electron beam irradiation tube (7) is sealed by the rotating body (12), and the inside of the isolation chamber (r) is kept in a safe state. Be done.

Then, the door (d) of the manifold (8) is opened, and the operator or the like can directly remove the electron gun (2) and take it out of the cell (c) through the manifold (8). Not only the inspection work of the electron gun (2) but also the filament can be easily replaced.

In this way, the electron gun (2) can be reliably maintained and inspected, and maintenance and management can be performed reliably because the operator can directly perform the manual work without using a manipulator as in the conventional welding device. In addition, the electron gun (2) is less contaminated by radioactive materials, and the liquid waste such as cleaning water and cleaning chemicals required for decontamination work is reduced, which is economically advantageous.

In addition, in a work using a manipulator or the like as in a conventional welding device, even if the operation is performed with caution, the working portion often hits the electron gun (2), which may damage the electron gun (2) or cause the electron gun (2) to be damaged. Although there was a case that the irradiation direction of the beam was distorted, such a problem could be completely eliminated, and the operating rate of this welding device could be greatly improved.

Further, the inside of the cell (c) is maintained at a negative pressure by the cell ventilation system, and the inside of the vacuum chamber (1) is maintained at a negative pressure by using the exhaust device (4) for the vacuum chamber, so that the radioactive substance can be more reliably discharged. Can be prevented from leaking out of the cell (c).

The above-described embodiments are merely specific examples of the present invention. Therefore, the scope of the technical idea of the present invention is not limited by the above-described embodiments, and within the scope of the technical idea of the present invention. You can freely change the design.

[Effect of device]

As described above in detail, according to the electron beam welding apparatus for harmful materials of the present invention, the harmful substances inside the cell are sealed by the body of the shutter device, and the harmful substances inside the vacuum chamber close the shutter device. While the cells are hermetically sealed, harmful substances are isolated by the isolation wall of the cell during welding.Therefore, workers do not have to enter the inside of the cell when replacing the filament as in the conventional welding equipment, and the manipulator is used. Needless to say, due to the fact that the electron gun can be directly taken out and replaced by a worker manually, a large amount of equipment investment is not required, and the reliability of the electron beam welding equipment after maintenance is improved. Secured now.

Furthermore, when a part of the electron gun was taken out of the cell for maintenance and inspection, a large amount of liquid waste such as cleaning water and cleaning chemicals was generated for decontamination work. Therefore, the efficiency of the maintenance and inspection work of the electron beam welding apparatus is improved and the economy is greatly improved.

[Brief description of drawings]

1 to 3 relate to an electron beam welding apparatus for harmful substances according to an embodiment of the present invention, FIG. 1 is a schematic sectional view of the structure, FIG. 2 is an explanatory sectional view of a shutter, and FIG. Is a sectional view taken along line III-III in FIG. 2, FIGS. 4 and 5 are related to an electron beam welding apparatus of a conventional example, FIG. 4 is a perspective view of a first conventional example, and FIG. 5 is a second conventional example. FIG. (C) ... cell, (d) ... door, (r) ... isolation room, (s) ...
Seal, (w) ... Isolation wall, (Wc) ... Cell isolation wall,
(1) ... vacuum chamber, (2) ... electron gun, (7) ... electron beam irradiation tube, (8) ... manifold, (10) ... shutter device, (11) ... shutter body, (12) ... rotating body, (1
3)… Rotary shaft, (14)… Open / close lever, (15)… Cylinder.

Claims (1)

[Scope of utility model registration request] 1. A vacuum chamber for accommodating an object to be welded is provided inside a cell having an opening capable of sealing a harmful substance in the harmful substance isolation wall, and the harmful substance isolation wall including the opening and the inside of the cell. An isolation chamber is formed by the isolation wall having a function of sealing harmful substances, and an electron gun is provided on the isolation chamber side of the isolation wall, and an electron beam exit side of the electron gun and the vacuum chamber are provided as a shutter device. An electron beam welding device for harmful materials, characterized in that they are communicated with each other.