CN212146257U

CN212146257U - Assembly adjusting tool for bolt stretcher of reactor pressure vessel

Info

Publication number: CN212146257U
Application number: CN202020311743.1U
Authority: CN
Inventors: 刘勇; 刘海庭; 易良川; 尤晓波; 曾振华; 隋震; 曹晔; 张建军; 张军超; 赵翔
Original assignee: Jiangsu Nuclear Power Corp
Current assignee: Jiangsu Nuclear Power Corp
Priority date: 2020-03-13
Filing date: 2020-03-13
Publication date: 2020-12-15
Anticipated expiration: 2030-03-13

Abstract

The utility model belongs to the technical field of nuclear power station reactor overhauls, concretely relates to reactor pressure vessel bolt stretcher equipment adjustment tool, including adjustment tool body setting on the stretcher body, the adjustment tool body includes: the adjusting tool comprises an adjusting tool positioning pin, a limiting bolt A, a limiting bolt B, a fine adjusting bolt and a coarse adjusting bolt; the one end of adjustment tool body is fixed with adjustment tool locating pin, installs spacing bolt A, spacing bolt B, fine-tuning bolt and coarse adjusting bolt from a left side to the right side in proper order on the other end of adjustment tool body, the utility model discloses can realize the accurate centering of bolt stretcher two halves ring, make fastening bolt can be fast accurate insert in the locating hole that corresponds to realize the connection and the fastening of two semi-rings.

Description

Assembly adjusting tool for bolt stretcher of reactor pressure vessel

Technical Field

The utility model belongs to the technical field of nuclear power station reactor overhauls, concretely relates to reactor pressure vessel bolt stretcher equipment adjustment tool.

Background

The first-stage project of a certain nuclear power station comprises two units, wherein the reactor is a B-428 type reactor, and the sealing of the reactor pressure vessel and the top cover of the upper component is realized by the common matching of 54 main bolts, 54 main nuts, 108 hemispherical gaskets and 2 nickel gaskets. The sealing principle is that 54 main bolts are stretched at one time by using a bolt stretcher, and the sealing of the top cover of the upper assembly is ensured under the action of the pretightening force of the bolts. The bolt stretcher mainly comprises a hydraulic unit, a working platform, a reaction nut driving motor, a support ring, a test bench, a control element, a manipulator, a stretching unit, a control console and a transformer. The maximum drawing pressure was 2055bar and the weight was 41.5 tons.

For operating a plant, the bolt stretcher is used only during the overhaul of the plant for unsealing and sealing the reactor pressure vessel. Other equipment storage facilities outside the reactor plant are stored during the daily life. The width of the equipment gate of the 1 and 2# units of a certain nuclear power station can not meet the requirement of overall transportation of the bolt stretcher, so that the bolt stretcher can not be transported integrally when being transported into or out of a reactor plant, and the bolt stretcher needs to be disassembled into two halves and transported through the transportation base respectively. The semi-rings are also stored in the storage factory respectively. After the bolt stretcher is transported into a reactor plant, the bolt stretcher needs to be assembled into a whole before being used. Therefore, in order to ensure that the working performance of the bolt stretcher is normal when the reactor is unsealed and sealed, the bolt stretcher needs to be debugged after the assembly is finished so as to ensure that hydraulic oil does not leak from joints of the stretcher and that the indication of each limit switch is normal.

Because the two semi-rings of the stretcher are mainly connected through 18 bolts when being assembled into a whole, 9 on each side are symmetrically distributed. When the bolt stretcher is assembled, the gap is small, and the bolt cannot penetrate due to slight deviation. In order to ensure the accurate centering of the two semi-rings, the position of the bolt needs to be repeatedly adjusted by using a crane so as to be conveniently and smoothly penetrated, and a large amount of manpower and time are consumed each time.

Therefore, in order to solve the problems existing in the conventional assembly mode, an assembly adjusting tool of a reactor pressure vessel bolt stretcher needs to be designed and developed, the difficulty that two halves of the stretcher cannot be accurately centered can be overcome, a crane does not need to be occupied, and manpower and time can be greatly saved.

SUMMERY OF THE UTILITY MODEL

The utility model aims at designing a reactor pressure vessel bolt stretcher equipment adjustment tool for when solving bolt stretcher equipment among the prior art, because of the clearance is less, then lead to the technical problem that the bolt can't penetrate when there is slight deviation.

The technical scheme of the utility model:

the utility model provides a reactor pressure vessel bolt stretcher equipment adjustment tool, adjustment tool body 6 sets up on stretcher body 3, stretcher body 3 includes stretcher right semi-ring 12 and stretcher left semi-ring 13, and adjustment tool body 6 includes: an adjusting tool positioning pin 5, a limiting bolt A7, a limiting bolt B8, a fine adjusting bolt 9 and a coarse adjusting bolt 10; an adjusting tool positioning pin 5 is fixed at one end of the adjusting tool body 6, and a limit bolt A7, a limit bolt B8, a fine adjusting bolt 9 and a coarse adjusting bolt 10 are sequentially installed at the other end of the adjusting tool body 6 from left to right.

The whole adjusting tool body 6 is of an L-shaped structure, the whole adjusting tool positioning pin 5 is of a T-shaped structure, and the length of the longest edge of the adjusting tool body 6 is matched with the thicknesses of the right half ring 12 and the left half ring 13 of the stretcher.

And the stretcher right semi-ring 12 and the stretcher left semi-ring 13 are symmetrically provided with connecting bolt holes 11 respectively.

The end of the adjusting tool positioning pin 5 which is not in contact with the adjusting tool body 6 is inserted into the connecting bolt hole 11 of the left half ring 13 of the stretcher.

The size of one end of the adjusting tool positioning pin 5 inserted into the left half ring 13 of the drawing machine is matched with the size of the connecting bolt hole 11 of the left half ring 13 of the drawing machine.

One end of the limiting bolt A7 and the limiting bolt B8 screwed into the adjusting tool body 6 is contacted with the bottom of the left half ring 13 of the stretcher, so as to prevent the left half ring 13 of the stretcher from shaking.

One end of the fine adjusting bolt 9 and the coarse adjusting bolt 10 screwed into the adjusting tool body 6 is in contact with the bottom of the right half ring 12 of the stretcher, and the fine adjusting bolt and the coarse adjusting bolt are used for horizontally aligning the right half ring 12 of the stretcher with the left half ring 13 of the stretcher and reducing the dislocation gap between the right half ring 12 of the stretcher and the left half ring 13 of the stretcher. The utility model has the advantages that:

1) the utility model discloses according to the field device structure, the reactor pressure vessel bolt stretcher equipment adjustment tool of design can realize the accurate centering of two semi-rings of bolt stretcher, makes fastening bolt can be fast accurate insert in the locating hole that corresponds to realize the connection and the fastening of two semi-rings.

2) During the actual operation period of overhaul of a certain

nuclear power station

1 or 2# unit, a bolt stretcher needs to be transported into a certain assembly hall in half in advance, and assembly and debugging are carried out. According to past experience, the assembly of the stretching machine requires a lot of manpower and time, and 50 man-hours are expected to be required each time, wherein 16 man-hours are required for the bolt connection and fastening of the two half rings of the stretching machine. And the reactor overhauls on the work is mostly in the key path of overhaul, personnel and time are all very valuable, adopt the utility model discloses a bolt stretcher assembles adjustment tool after, the bolted connection and the fastening of two semi-rings of bolt stretcher at every turn only need 3 people man-hour, have effectively practiced thrift work load and time.

Drawings

Fig. 1 is a schematic structural view of an assembly adjustment tool of a bolt stretcher according to the present invention;

fig. 2 is a schematic view of the bolt stretcher assembly adjusting tool and the stretcher matching according to the present invention;

FIG. 3 is a schematic view of the two half rings of the bolt stretching machine

Wherein: 1-connecting bolt, 2-gasket, 3-stretcher body, 4-stretching cylinder, 5-adjusting tool positioning pin, 6-adjusting tool body, 7-limiting bolt A, 8-limiting bolt B, 9-fine adjusting bolt 10-coarse adjusting bolt, 11-connecting bolt hole, 12-stretcher right half ring and 13-stretcher left half ring.

Detailed Description

The stretcher needs to be assembled and debugged respectively before and during overhaul of the unit so as to ensure that all functions of the stretcher are normal. The invention will be further described with reference to the accompanying drawings and examples:

One end of the fine adjusting bolt 9 and the coarse adjusting bolt 10 screwed into the adjusting tool body 6 is in contact with the bottom of the right half ring 12 of the stretcher, and the fine adjusting bolt and the coarse adjusting bolt are used for horizontally aligning the right half ring 12 of the stretcher with the left half ring 13 of the stretcher and reducing the dislocation gap between the right half ring 12 of the stretcher and the left half ring 13 of the stretcher.

Example (b):

the utility model relates to a reactor pressure vessel bolt stretcher equipment adjustment tool's concrete application method does: (1) respectively placing the half ring 12 and the half ring 13 on a test bench by using a crane, and checking the relative positions of the two half rings when the other half of the half ring of the stretcher is dropped on the test bench to align the two half rings as much as possible; (2) inserting the bolt stretcher assembly adjusting tool positioning pin 5 into the positioning blind hole of the sunken stretcher half ring, wherein the sunken stretcher half ring is a stretcher left half ring 13 in the embodiment as shown in fig. 2; (3) checking the dislocation gap between the two half rings, as shown in fig. 2, screwing a limit bolt A7 and a limit bolt B8 into the half rings until the head of the bolt is contacted with the bottom of the invaginated half ring of the stretcher, so as to prevent shaking; (4) firstly, screwing the rough adjusting bolt 10, adjusting the staggered half ring of the stretcher to be basically flush with the other half ring, and then screwing the fine adjusting bolt 9, and completely adjusting the two half rings of the stretcher to be consistent; (5) taking out the adjusting tool and penetrating the connecting bolt; (6) the same method is adopted to perfectly adjust other dislocation positions.

The utility model discloses a reactor pressure vessel bolt stretcher equipment adjustment tool has successfully been used during a certain nuclear power station overhaul many times, has realized stretcher fast assembly, has practiced thrift work load, has guaranteed going on smoothly of follow-up reactor pressure vessel unseal and seal work. The tool can be popularized and applied in the related work of the same type of units, and has good reference significance for the assembly of other similar equipment in the same industry.

The present invention has been described in detail with reference to the accompanying drawings and examples, but the present invention is not limited to the above examples, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art. The present invention can adopt the prior art for the content which is not described in detail in the present invention.

Claims

1. The utility model provides a reactor pressure vessel bolt stretcher equipment adjustment tool, its characterized in that adjustment tool body (6) set up on stretcher body (3), stretcher body (3) include stretcher right half ring (12) and stretcher left half ring (13), and adjustment tool body (6) include: an adjusting tool positioning pin (5), a limiting bolt A (7), a limiting bolt B (8), a fine adjusting bolt (9) and a coarse adjusting bolt (10); an adjusting tool positioning pin (5) is fixed at one end of the adjusting tool body (6), and a limiting bolt A (7), a limiting bolt B (8), a fine adjusting bolt (9) and a coarse adjusting bolt (10) are sequentially installed at the other end of the adjusting tool body (6) from left to right.

2. The tool of claim 1 for adjusting the assembly of a bolt stretcher for a reactor pressure vessel, wherein: the whole adjusting tool body (6) is of an L-shaped structure, the whole adjusting tool positioning pin (5) is of a T-shaped structure, and the length of the longest side of the adjusting tool body (6) is matched with the thicknesses of the right half ring (12) and the left half ring (13) of the drawing machine.

3. The tool of claim 2, wherein the tool comprises: and the drawing machine right half ring (12) and the drawing machine left half ring (13) are symmetrically provided with connecting bolt holes (11) respectively.

4. The tool of claim 1 for adjusting the assembly of a bolt stretcher for a reactor pressure vessel, wherein: one end of the adjusting tool positioning pin (5) which is not in contact with the adjusting tool body (6) is inserted into a connecting bolt hole (11) of a left half ring (13) of the stretcher.

5. The tool of claim 4 for adjusting the assembly of a bolt stretcher for a reactor pressure vessel, wherein: the size of one end of the adjusting tool positioning pin (5) inserted into the left half ring (13) of the stretcher is matched with the size of the connecting bolt hole (11) of the left half ring (13) of the stretcher.

6. The tool of claim 5 for adjusting the assembly of a bolt stretcher for a reactor pressure vessel, wherein: one end of the limiting bolt A (7) and one end of the limiting bolt B (8) screwed into the adjusting tool body (6) are in contact with the bottom of the left half ring (13) of the stretcher, and the limiting bolt A and the limiting bolt B are used for preventing the left half ring (13) of the stretcher from shaking.

7. The tool of claim 6, wherein the tool comprises: one end of the fine adjustment bolt (9) and one end of the coarse adjustment bolt (10) which are screwed into the adjustment tool body (6) are in contact with the bottom of the right half ring (12) of the stretcher, and the fine adjustment bolt and the coarse adjustment bolt are used for horizontally aligning the right half ring (12) of the stretcher with the left half ring (13) of the stretcher and reducing the dislocation gap between the right half ring (12) of the stretcher and the left half ring (13) of the stretcher.