JPH054100U - A device for preventing inclusion of an irradiation target in an electron beam irradiation device - Google Patents

Abstract

(57) [Abstract] [Purpose] To prevent the irradiation target from being caught in the slit of the shield. [Structure] The flow of air accompanying ozone exhaust in the irradiation chamber passes through a slit 7 provided in the shield 3. A plurality of rollers 11 are provided on the exhaust outlet side of the slit and the inlet side of the irradiation object 5.
Place ₁ to 11 ₃ in parallel. The irradiation target 5 is introduced into the slit through the roller juxtaposed region by the transfer device 6. The flow of air through the slit is the slit and the roller,
It flows out from the gap between the rollers, and the flow amount is smaller in the gap farther from the slit. The tip of the irradiated object does not blister due to the exhaust flow, and even if it floats up due to the flow of air, it is guided by the roller, so the irradiated object is smoothly introduced into the slit and the entrained state does not occur. ..

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a device for preventing entrainment of an irradiation target in a slit portion of a shield of an electron beam irradiation device.

[0002]

[Prior Art]

The electron beam irradiation system is constructed so that the radiation generated inside is shielded by a shield so that it does not leak outside, and the irradiation target is carried in and out through a slit provided on the shield. Has been done. Figure 4 shows a schematic cross-sectional view of a electron beam irradiation device, irradiation chamber 1, the inlet-side preliminary chamber 2 _1, the outlet-side preliminary chamber 2 ₂ lead or concrete - are covered by the shield 3 by preparative. An electron beam from an electron beam generation source above the irradiation chamber 1 (not shown) passes through the scanning tube 4 and is irradiated onto the irradiation target 5. A transfer device 6 is provided to transfer the irradiation target 5 into the electron beam irradiation device in the direction of the arrow, and the irradiation target 5 is placed on the transfer device 6 and passes through the slit 7 provided in the shield 3. To do. The slit 7 is constructed so that the opening (width) of the slit 7 is as narrow as possible within a range that does not interfere with the loading and unloading of the irradiation target 5 so as to reduce the leakage of radiation.

[0003]

[Problems to be solved by the device]

 When electron beam irradiation is performed in an air atmosphere, ozone is generated. In the case of such irradiation, it is necessary to provide an exhaust port 8 in the irradiation chamber 1 and forcibly exhaust the atmosphere in the irradiation chamber. This causes a flow of air from the outside of the electron beam irradiation device into the irradiation chamber 1 through the slit 7 of the shield 3, and especially at the slit portion where the flow velocity is high, the tip of the irradiation target object 5 to be conveyed is generated. The phenomenon of curling up and rolling up occurs. The irradiation target 5 is transferred by the transfer device 6, and since this transfer is generally high-speed, when the burr phenomenon occurs, the rolled-up state a of the irradiation target 5 occurs instantly and the slit 7 is clogged. It will be in a state where it will stop. As a result, the object to be irradiated 5 cannot be transported, and the transport device 6 is overloaded, and in the worst case, the transport device 6 is disconnected, resulting in damage or failure of the device. In this respect, there is a slit 7 provided with a guide plate 9, which has the effect of preventing the irradiated object 5 from hitting the corners and corners of the slit 7, but the air flow, Since the speed of the exhaust flow rather increases, it is not possible to prevent the phenomenon that the irradiated object 5 blisters, and if a means for detecting the entrainment state is provided and the output of the carrying device 6 is responded to, the device can be prevented from malfunctioning. Even if it is possible, the trapped state itself cannot be eliminated, and the occurrence of the trapped state due to the blistering phenomenon causes a situation in which the production work by the electron beam irradiation device is stopped.

It is an object of the present invention to provide an apparatus capable of preventing the occurrence of a wound state of an irradiation target object in the slit portion of the shield 3.

[0005]

[Means for Solving the Problems]

 The present invention is characterized in that, in the electron beam irradiation apparatus, a plurality of rollers are juxtaposed adjacent to the slit portion of the shield.

[0006]

[Action]

 Air flow and exhaust flow through the slit are weakened and flow out from the gap between the slit and the roller, and between the roller and the roller, so that the irradiated object is hardly affected by the air flow. While being transferred from the roller placement position to the roller side-by-side installation part, even if the tip of the irradiated object floats up, it is guided by the circumferential part of the roller and enters the slit into the smooth, The burr phenomenon and the occurrence of the entrained state are prevented.

[0007]

【Example】

 An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a perspective view of a slit portion, FIG. 2 is a schematic sectional view of an electron beam irradiation device, and FIG. 3 is an explanatory diagram of an exhaust flow. The same reference numerals indicate the same parts including FIG. A plurality of rollers 11 are provided on the exhaust outlet side of the slit 7 provided on the shield 3 and on the upper part of the conveyance path of the irradiation target 5. ₁ Through 11₃Are installed in parallel. The exhaust gas flow passing through the slit 7 is directed to the slit 7 and the roller 11 as shown by the arrow in FIG.₁, Roller 11₁And roller 11₂, Roller 11₂And Rolla 11₃The amount of outflow is larger in the gap closer to the slit 7, and the amount of outflow is smaller as the distance from the slit increases. Therefore, the irradiation object 5 is conveyed by the conveying device 6 in the direction of the arrow in FIGS. It will enter 7. Then, even if the tip of the irradiation object 5 floats up under the influence of the exhaust gas flow in the process of passing through the roller installation area, each roller 11₁Through 11₃The tip of the irradiation object 5 is smoothly introduced into the slit 7 while being guided by the circumferential surface of the roller, which is rotated by contact with the irradiation object.

In the above-mentioned embodiment, the one in which the ozone in the irradiation chamber 1 is exhausted is shown. However, the present invention also supplies the inert gas to the irradiation chamber and performs the electron beam irradiation in the atmosphere of the inert gas. can be implemented, even in this case, the b - La 11 ₁ to 1 1 ₃ is provided to be irradiated inlet side exhaust flow outlet side in the slit. Each of the rollers 11 ₁ to 11 ₃ can be formed of a hollow body using a solid body or a pipe, and may be a non-rotating body. If it is made of lead or the like, it has a radiation shielding effect. Can be made. Then, the number of rollers provided in each slit portion may be appropriately determined according to the conveyance speed of the irradiation object, the exhaust flow rate, the size of the slit opening, and the like.

[0009]

[Effect of the device]

 Since the present invention is configured as described above, it is possible to reduce the influence of the exhaust gas flow from the slit on the irradiation target by the plurality of rollers arranged side by side, and it is possible to reduce the influence of the shield that is a problem in radiation shielding. The slit opening can be made narrower than the conventional one, and the roller itself can be provided with a shielding function, so that the radiation protection function can be improved. In addition, since a plurality of rollers are installed in parallel in the slit part, it is easy to implement in an electron beam irradiation device, and even in the electron beam irradiation device currently used, the internal structure is particularly It can be implemented without modification.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of the present invention.

FIG. 2 is a schematic sectional view of the entire electron beam irradiation apparatus of the embodiment.

FIG. 3 is an explanatory diagram of an exhaust flow.

FIG. 4 is a schematic sectional view of an entire conventional electron beam irradiation apparatus.

[Explanation of symbols]

3 Shield 5 Object to be irradiated 6 Transfer device 7 Slit 11 _{1 to} 11 ₃ Roller

Claims (1)

Claims for utility model registration: 1. A device for preventing entrainment of an object to be irradiated in an electron beam irradiation device, wherein a plurality of rollers are arranged in parallel adjacent to a slit portion of a shield.