JP3590963B2 - Electron beam irradiation device - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to an electron beam irradiation apparatus in which a capstan for conveying an object to be irradiated and a driving device for the capstan are mounted on a shielding door of an irradiation room to improve maintainability and work efficiency.
[0002]
[Prior art]
FIG. 3 and FIG. 4 are configuration diagrams of an irradiation chamber portion in a cross section orthogonal to each other in an example of an electron beam irradiation apparatus in which an object to be irradiated is an electric wire or a cable covered with, for example, an insulating layer. The electron beam irradiator has a self-shielding structure. The irradiation chamber 1 is formed by a fixed shielding chamber 2 and a shielding door 3 that covers an opening thereof, and the electron beam generator 4 is located at the back of the fixed shielding chamber. , And is installed at a position facing the shielding door. The fixed shielding room 2 is fixedly mounted on a frame 5, and the shielding door 3 is configured to be movable on a guide rail by wheels 7 attached to the door and a support member 6.
[0003]
An electron beam from the electron source and the accelerating tube in the electron beam generating unit 4 is irradiated from a scanning tube 8 of the generating unit onto an object 9 such as an electric wire or a cable conveyed into the irradiation chamber 1. A capstan or a roller (hereinafter, referred to as a capstan) 10 that conveys an irradiation target is attached to the fixed shielding chamber 2 by a bearing 11, a bearing cover member 12, and a support member 13. The irradiation object 9 such as an electric wire or a cable is wound between the two capstans 10 from the irradiation object entrance 14 of the fixed shielding chamber 2 through the rolling rollers 15 a plurality of times, and is conveyed into the irradiation area. Through the rolling rollers at different positions on the same axis as the moving roller 16 and the rolling roller 15, the irradiation object exits to the fixed shielding chamber. The electron beam that has passed through the irradiation area on the irradiation target 9 is captured by a beam catcher 17 attached to the shielding door 3.
[0004]
[Problems to be solved by the invention]
During maintenance, the irradiation door 1 is opened by moving the shielding door 3 in the direction of the arrow as shown in FIG. On the fixed shielding room 2 side, there are a ventilation mechanism for ozone generated in the irradiation room due to electron beam irradiation, a nozzle for cooling air blown to a window foil of an irradiation window at an end of the scanning tube 8, and irradiation with the maintenance. The window foil of the window deteriorates due to the transmission of the electron beam and must be replaced periodically. In this regard, if the capstan 10 is located in the narrow fixed shielded room 2 side, the maintenance work of the components in the fixed shielded room including the maintenance of the capstan is extremely troublesome.
[0005]
Further, the irradiation object 9 stretched over the capstan 10 is driven by being pulled from the outside. However, when the irradiation object such as an electric wire or a cable is pulled from the outside, elongation occurs, and the irradiation object 9 is heated by the irradiation of the electron beam. If it is, it will further promote elongation. Therefore, since the wire cannot be strongly pulled in consideration of the occurrence of elongation, the speed at which the wires and cables are conveyed is limited, and an object to be irradiated such as a thin wire cannot be pulled from the outside.
[0006]
An object of the present invention is to provide an electron beam irradiation apparatus capable of facilitating maintenance work of an electron beam irradiation apparatus and capable of transporting an irradiation target into an irradiation area without pulling from outside. is there.
[0007]
[Means for Solving the Problems]
An electron beam irradiation apparatus according to the present invention includes an irradiation chamber formed of a shielded door that opens and closes movably on a guide rail, and covers an opening of the fixed shielded chamber and the shielded chamber; And a capstan for transporting an object to be illuminated, and a driving device for the capstan, which is attached to the shielding door outside the irradiation chamber.
[0008]
[Action]
Since the capstan that conveys the irradiation object is not on the fixed shielding room side but on the shielding door, maintenance of the fixed shielding room and the capstan portion can be easily performed by opening the shielding door. In addition, since the capstan is driven by a driving device provided on the shielding door, the object to be irradiated can be transported into the irradiation area without being pulled from the outside, and the driving device is provided outside the irradiation chamber of the shielding door. Accordingly, the shielding and protection against X-rays and ozone generated in the irradiation chamber can be simplified since it is sufficient to consider a part leaking from a hole passing through a connecting shaft from the driving device to the capstan.
[0009]
【Example】
An embodiment of the present invention will be described with reference to the drawings. FIGS. 1 and 2 show configuration diagrams of the embodiment in cross sections orthogonal to each other. FIG. 2 is a cross-sectional configuration diagram along line AA in FIG. 1, and the same reference numerals as those in FIGS. Is shown. The electron beam irradiator has a self-shielding structure. The irradiation chamber 1 is formed by a fixed shielding chamber 2 and a shielding door 3 that covers an opening thereof. It is installed at a position facing the shielding door.
[0010]
The capstan 10 for transporting the irradiation object 9 is attached to the inside of the irradiation chamber of the shielding door 3 by the support member 13, and the capstan is driven by a driving device 18 attached to the shielding door 3 outside the irradiation chamber.
[0011]
The rotation of the connecting shaft 20 of the motor 19 in the driving device 18 is transmitted to the branch connecting shaft 22 in the direction of the two capstans 10 by the gear box 21 and further penetrates the hole 24 of the shielding door 3 by the gear box 23. Is transmitted to the capstan shaft through the connecting shaft 25 and the gear box 26. The gear box 26 located in the irradiation chamber 1 is casing with a gear cover 27 made of a stainless steel plate to protect the gear from ozone, and the inside of the cover is opened by air purging to prevent intrusion of ozone into the gear box from a gap between the covers. Pressure.
[0012]
Since the X-rays generated in the irradiation chamber leak from the holes 24 of the shielding door 3 through which the connecting shaft 25 penetrates, around the gear boxes 21 and 23 outside the shielding door, the X-ray shielding and the rotation from the rotating connecting shaft. For example, it is covered with a shielding box 28 lined with, for example, lead and also serves as a protective cover for safety. This shielding box provided closing portion 28 ₁ for maintenance, but for X-ray safety measures, a limit switch provided in the switching unit, and the like attaching the key, during operation of the electron beam irradiation device opened If the driver forgets to close it, it will be detected by the limit switch so that the driver cannot operate.
[0013]
【The invention's effect】
Since the present invention is configured as described above, the capstan for transporting the object to be irradiated is provided on the shielding door of the irradiation chamber. By opening the shielding door, under a large maintenance space, the fixed shielding chamber is opened. The maintenance of the capstan unit and its driving mechanism can be easily performed. Further, since the capstan is driven by the driving device provided on the shielding door, the irradiation target can be transported into the irradiation area without being pulled from the outside.
[0014]
It is conceivable that the capstan driving device is provided inside the irradiation room of the shielding door, but X-rays and ozone are generated in the irradiation room, and the driving device including the motor is electrically and mechanically used in the X-ray field. Since it causes troubles and rust is generated by the ozone generated by the electron beam, it is necessary to put the whole drive unit in a lead box covered with stainless steel, and to purge the inside of the box with air to prevent intrusion of ozone. . However, in order to protect from X-rays, at an acceleration voltage of 800 kV, lead having a thickness of 120 to 140 mm is required, the weight is extremely increased, and the maintenance thereof is also difficult. In this regard, in the present invention, the capstan driving device is provided outside the irradiation chamber of the shielding door, and a portion related to driving the capstan located inside the irradiation chamber only needs to be a gear box (26), which is generated in the irradiation chamber. Regarding the influence of X-rays and ozone, it is only necessary to consider the part leaking out of the shielding door and the part leaking from the hole provided in the shielding door through which the connecting shaft (25) for the capstan passes. The structure can be made simple and lightweight, and since the driving device is provided outside the irradiation chamber, maintenance becomes easy and the life of the driving device can be extended.
[Brief description of the drawings]
FIG. 1 is a sectional configuration diagram of an embodiment of the present invention.
FIG. 2 is a cross-sectional configuration diagram taken along line AA in FIG.
FIG. 3 is a sectional view showing an example of a conventional electron beam irradiation apparatus.
FIG. 4 is a configuration diagram in a cross section orthogonal to FIG. 3 of the electron beam irradiation apparatus shown in FIG. 3;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Irradiation room 2 Fixed shielding room 3 Shielding door 9 Irradiation object 10 Capstan 18 which conveys an illumination object Capstan driving device 19 Motors 21, 23, 26 Gear boxes 20, 22, 25 Connecting shaft 24 holes

Claims (1)

The opening of the fixed shield chamber (2) and the shielding chamber cover, irradiation chamber formed in a shielding door movably closing on the guide rail (3) and (1), wherein the shielding door (3) irradiation chamber (1) attached to the inside, a capstan for transporting the object to be irradiated (9) (10), wherein the irradiation chamber of shielding door (3) (1) attached to the outside, the capstan ( And a drive mechanism (18) including a motor (19) for driving the cap (10). The drive mechanism (18) drives the capstan (10) to rotate the motor (19). (3) is provided outside the irradiation chamber (1) of the shielding door (3) via a connection shaft (20, 22) provided outside the irradiation chamber (1) and is surrounded by a shielding box (28). Gear box (23), and then the gear box (23) Through the connection shaft (25) provided through the hole (24) provided in the shielding door (3), it is transmitted to the gear box (26) in the irradiation chamber (1), and the capstan (10) is provided. An electron beam irradiation apparatus characterized in that the electron beam irradiation apparatus is configured to be driven .

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