Patent Number: 
Section: claims

1. A device for removing foreign objects from nuclear reactor vessel, comprising:a suction pipe capable of extending into the nuclear reactor vessel;a suction opening structure disposed at a lower end of the suction pipe, wherein the suction opening structure has a suction opening thereon and an upper end of the suction opening structure is connected to the suction pipe;an electric valve disposed at a connection of the suction pipe and the suction opening structure;a filter mesh located in the suction pipe and above the electric valve;a suction pump located in the suction pipe and above the filter mesh; anda drainage pipe; wherein a water inlet of the suction pump is communicated with the suction opening of the suction opening structure, a water outlet of the suction pump is communicated with an outside space of the suction pipe though the drainage pipe, and the device further comprises a touch switch disposed on the filter mesh, wherein the touch switch is in operative connection with the electric valve, and wherein a foreign object impact force to the filter mesh triggers the touch switch to close which causes the electric valve to close which prevents escape of the foreign object from the device. 2. The device for removing foreign objects from nuclear reactor vessel according to claim 1, the electric valve comprising a spool with mesh structure. 3. The device for removing foreign objects from nuclear reactor vessel according to claim 1, further comprising a controlling switch disposed on a top portion of the suction pipe. 4. The device for removing foreign objects from nuclear reactor vessel according to claim 1, further comprising an operating handle disposed on the top portion of the suction pipe. 5. The device for removing foreign objects from nuclear reactor vessel according to claim 1, wherein the drainage pipe comprises an upward outlet, preventing the foreign objects flowing with water. 6. The device for removing foreign objects from nuclear reactor vessel according to claim 1, further comprising an alarm disposed on the top portion of the suction pipe, wherein the alarm is connected to and controlled by the touch switch, when the touch switch is triggered and closed, the alarm will inform the operator to check whether there are foreign objects sucked. 7. The device for removing foreign objects from nuclear reactor vessel according to claim 2, further comprising an alarm disposed on the top portion of the suction pipe, wherein the alarm is connected to and controlled by the touch switch, when the touch switch is triggered and closed, the alarm will inform the operator to check whether there are foreign objects sucked. 8. The device for removing foreign objects from nuclear reactor vessel according to claim 3, further comprising an alarm disposed on the top portion of the suction pipe, wherein the alarm is connected to and controlled by the touch switch, when the touch switch is triggered and closed, the alarm will inform the operator to check whether there are foreign objects sucked. 9. The device for removing foreign objects from nuclear reactor vessel according to claim 4, further comprising an alarm disposed on the top portion of the suction pipe, wherein the alarm is connected to and controlled by the touch switch, when the touch switch is triggered and closed, the alarm will inform the operator to check whether there are foreign objects sucked. 10. The device for removing foreign objects from nuclear reactor vessel according to claim 5, further comprising an alarm disposed on the top portion of the suction pipe, wherein the alarm is connected to and controlled by the touch switch, when the touch switch is triggered and closed, the alarm will inform the operator to check whether there are foreign objects sucked.