A method for cutting the C-ring at the lower part of a large shielded main pump
A cutting method and large-scale technology, applied in the details of milling machine equipment, metal processing equipment, milling machine equipment, etc., can solve the problems of difficult maintenance of the shielded main pump, small on-site chamber space, affecting the radiation safety and maintenance efficiency of maintenance personnel, etc. The effect of shortening critical path time, reducing total radiation dose, and simple structure
Active Publication Date: 2020-12-04
SANMEN NUCLEAR POWER CO LTD
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Problems solved by technology
[0005] 3. Due to the narrow space of the on-site chamber, and the distance between the bottom of the shielded main pump and the ground is about 1.3 meters, it seriously affects the radiation safety and maintenance efficiency of maintenance personnel in a radioactive environment
The above factors have brought great difficulties to the online maintenance of the shielded main pump
Method used
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[0033] The following are specific embodiments of the present invention and in conjunction with the accompanying drawings, the technical solutions of the present invention are further described, but the present invention is not limited to these embodiments.
[0034] Such as figure 1 , a method for cutting the lower C-ring of a large shielded main pump according to the present invention comprises:
[0035] Step S01, installing the cutting device under the lower stator end cover of the shielded main pump;
[0036] Step S02, placing a jack under the stator end cover for supporting the stator end cover;
[0037] Step S03, removing the main bolts of the stator end cover, and cutting the lower C ring of the shielded main pump with a cutting device;
[0038] Step S04, removing the cutting device and the jack;
[0039] Such as figure 2 , the cutting device includes a base 4 , a moving ring 7 , a motor 10 , and a knife holder 5 . The base 4 is used to fix the bottom of the stator ...
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The invention discloses a large shielding main pump lower C ring cutting method, and belongs to the technical field of nuclear power station large shielding main pump maintenance. The method comprisesthe steps that firstly, a cutting device is arranged below a stator end cover at the lower portion of a shielding main pump; secondly, a jack is arranged below the stator end cover and used for jacking and supporting the stator end cover; thirdly, a stator end cover main bolt is dismounted, and the cutting device is utilized for cutting a shielding main pump lower C ring; and fourthly, the cutting device and the jack are dismounted. The cutting device comprises a base, a movable ring, a motor and a tool rest. The base is used for being fixed at the stator end cover position below the shielding main pump, and the movable ring is installed on the base through a roller bearing so that the movable ring can rotate relative to the base. The side face of the movable ring is provided with a toolarm, and the tool rest is arranged on the tool arm. The motor is arranged on the movable ring, the motor is in transmission connection with the movable ring, the tool rest rotates along with the movable ring, and accordingly the lower C ring can be cut in the radial direction. According to the large shielding main pump lower C ring cutting method, operation is simple, the radiation protection riskof maintenance personnel is reduced, and the overhauling precision and quality are improved.
Description
technical field [0001] The invention belongs to the technical field of maintenance of large-scale shielded main pumps of nuclear power plants, and in particular relates to an online maintenance process of large-scale shielded main pumps. Background technique [0002] After the nuclear power plant has been in operation for a long time, the possibility of problems in the lower important parts such as the lock cup of the shielded reactor coolant pump (hereinafter referred to as the shielded main pump) gradually increases. Plan ahead and develop a large shielded main pump in a radioactive environment. Overhaul process is necessary. The pump casing of the shielded main pump is welded to the bottom head of the steam generator. The shielded main pump is installed on the pump casing upside down through 24 main bolts, and the lower locking cup and lower thrust bearing of the shielded main pump are located under the shielded main pump. The lower stator end cover is arranged below the...
Claims
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IPC IPC(8): B23C3/00
CPCB23C3/00
Inventor 董宝泽李涛李松王斌元廖长城郦元辉王信东耿加森曹阳王扬王超林鑫辉
Owner SANMEN NUCLEAR POWER CO LTD