Patent Number: 
Section: claims

1. A system with function of bending and elongation for discharging foreign matters from nuclear reactor vessel, comprising an operating rod capable of extending into the nuclear reactor vessel, wherein the operating rod comprises:a suction pipe;a bendable rod section connected to an upper end of the suction pipe;an expandable rod section connected to an upper end of the bendable rod section;a suction opening disposed at a lower end of the suction pipe;an electric valve disposed at a connection of an upper end of the suction opening and the suction pipe;a filter mesh disposed in the suction pipe and above the electric valve;a suction pump disposed in the suction pipe and above the filter mesh;a touch switch disposed on the filter mesh, wherein the touch switch is in operative connection with the electric valve and wherein a foreign matter impact force to the filter mesh triggers the touch switch to close which causes the electric valve to close which prevents escape of foreign matter from the system; anda drainage pipe; wherein a water inlet of the suction pump is connected to the suction opening, a water outlet of the suction pump is connected to an outside space of the suction pipe though the drainage pipe, and the electric valve is controlled by the touch switch. 2. The system with function of bending and elongation for discharging foreign matters from nuclear reactor vessel according to claim 1, wherein the electric valve comprises a valve with mesh structure. 3. The system with function of bending and elongation for discharging foreign matters from nuclear reactor vessel according to claim 1, further comprising a control switch disposed on an upper end of the expandable rod section. 4. The system with function of bending and elongation for discharging foreign matters from nuclear reactor vessel according to claim 1, further comprising an operating handle disposed on the upper end of the expandable rod section. 5. The system with function of bending and elongation for discharging foreign matters from nuclear reactor vessel according to claim 1, wherein the drainage pipe comprises an outlet disposed upward, preventing the foreign matters flowing with water. 6. The system with function of bending and elongation for discharging foreign matters from nuclear reactor vessel according to claim 1, further comprising an alarm disposed on the upper end of the suction pipe, wherein the alarm is connected to and controlled by the touch switch, when the touch switch is triggered and then closed, the alarm will inform the operator to check whether there are foreign matters sucked. 7. The system with function of bending and elongation for discharging foreign matters from nuclear reactor vessel according to claim 2, further comprising an alarm disposed on the upper end of the suction pipe, wherein the alarm is connected to and controlled by the touch switch, when the touch switch is triggered and then closed, the alarm will inform the operator to check whether there are foreign matters sucked. 8. The system with function of bending and elongation for discharging foreign matters from nuclear reactor vessel according to claim 3, further comprising an alarm disposed on the upper end of the suction pipe, wherein the alarm is connected to and controlled by the touch switch, when the touch switch is triggered and then closed, the alarm will inform the operator to check whether there are foreign matters sucked. 9. The system with function of bending and elongation for discharging foreign matters from nuclear reactor vessel according to claim 4, further comprising an alarm disposed on the upper end of the suction pipe, wherein the alarm is connected to and controlled by the touch switch, when the touch switch is triggered and then closed, the alarm will inform the operator to check whether there are foreign matters sucked. 10. The system with function of bending and elongation for discharging foreign matters from nuclear reactor vessel according to claim 5, further comprising an alarm disposed on the upper end of the suction pipe, wherein the alarm is connected to and controlled by the touch switch, when the touch switch is triggered and then closed, the alarm will inform the operator to check whether there are foreign matters sucked. 11. The system with function of bending and elongation for discharging foreign matters from nuclear reactor vessel according to claim 6, wherein the expandable rod section is telescopic sleeve structure. 12. The system with function of bending and elongation for discharging foreign matters from nuclear reactor vessel according to claim 7, wherein the bendable rod section is coiled tube structure.