CN211207984U

CN211207984U - Quick centering device for reactor top cover lifting appliance

Info

Publication number: CN211207984U
Application number: CN201921795959.3U
Authority: CN
Inventors: 孟海军; 闫永巍; 程鹏; 吴怡轩
Original assignee: China General Nuclear Power Corp; CGN Power Co Ltd; China Nuclear Power Operation Co Ltd
Current assignee: China General Nuclear Power Corp; CGN Power Co Ltd; China Nuclear Power Operation Co Ltd
Priority date: 2019-10-22
Filing date: 2019-10-22
Publication date: 2020-08-07
Anticipated expiration: 2029-10-22

Abstract

The utility model discloses a quick centering device for a reactor head cover lifting appliance, which comprises a positioning block arranged between two ear plates of a lifting lug on a pressure vessel head cover, two limiting plates arranged on the two opposite sides of the positioning block and abutted with the end faces of the ear plates, and a distance adjusting component connected with the positioning block and the limiting plates and used for adjusting the distance between the positioning block and the limiting plates; the positioning block comprises a first surface and a second surface opposite to the first surface; the second surface is provided with an inwards concave arc-shaped surface matched with the end face of the lifting lug of the top cover lifting appliance. The utility model discloses a quick centering device is installed on the top cap of pressure vessel, is used for the centering of reactor top cap hoist and pressure vessel top cap, can guarantee the quick centering of top cap hoist and fall and be connected with the pressure vessel top cap, can practice thrift 0.3H key path time, fundamentally has avoided the route delay because of centering difficulty leads to; the operation is simple, the labor input is reduced, and the labor intensity is reduced, so that the irradiated dose of personnel can be effectively reduced.

Description

Quick centering device for reactor top cover lifting appliance

Technical Field

The utility model relates to a nuclear power technical field especially relates to a quick centering device for reactor head cover hoist.

Background

The nuclear power plant reactor roof structure mainly comprises the following components: top cap hoist, draft hood subassembly, antidetonation supporting device, cable tray and cable bridge subassembly. The main function of the head spreader is to hoist the pressure vessel head during refueling. The top of the top cover lifting appliance is a lifting hook, three upper suspension rods are hung downwards, the lower parts of the upper suspension rods are hinged on a star-shaped support, three lower suspension rods are hung at the lower part of the star-shaped support, the lower suspension rods are respectively hinged on three lifting lugs of the top cover of the pressure vessel, and a bolt stretcher guide rail is respectively fixed on the two lower suspension rods. The upper space of the star-shaped support is provided with a workbench for the work of maintainers. And the star-shaped support is also provided with an annular guide rail which provides a guide rail for the movement of the split bolt stretching machine.

The installation of the top cover lifting appliance is divided into three steps: connecting a top cover lifting appliance; the top cover lifting appliance is connected with the top cover lifting appliance pin and used for centering the U-shaped lifting lug on the top cover of the pressure vessel.

In the top cap hoist installation, the centering process very easy goes wrong. Wherein, three U type lug is connected on the lug of top cap hoist and the top cap, wherein two have been linked to each other, two wrong holes in U type lug on top cap hoist another lug and the top cap, U type lug exists to the outside and leans on to the inboard two kinds of circumstances partially, at this moment, then must use 1 long little crowbar, 1.6 long big crowbar and chain block of meter to finely tune, accomplish finally that three holes can both cooperate with the hoist, just can carry out being connected of hoist pin. The above centering operation has the following problems:

1. the lifting of the top cover belongs to formal switch cover work, the work is an absolute main path work of nuclear power plant maintenance, the planning time is 1H, the whole process of top cover lifting appliance installation is included, due to the existence of the centering problem, the path is delayed by 1.5H hours, the whole construction period is delayed, and the grid connection time of a unit is delayed;

2. in the process of centering the lifting appliance, workers need to turn over the small bridge fence, put the small bridge fence on the top cover of the reactor, and perform close-range observation and manual centering, wherein at least 3 persons are required to be fed each time, so that the labor is consumed, and the falling risk exists;

3. when the centering is in a problem, workers need to use crowbars and chain blocks for fine adjustment, wherein the weight of a large crowbar is about 15KG, the weight of the chain block is about 25KG, and all the workers are transferred onto the top cover from the small bridge, so that the risk of falling of a tool exists, and the bottom of a reactor pool is easily injured by smashing;

4. the fine adjustment process requires that personnel continuously use a crowbar and a chain block to be matched, and because the crowbar and the chain block are too heavy, the personnel are weak in the later adjustment period, the hands are easy to shake, the adjustment is not easy, and the labor intensity is high;

5. the reactor top cover is arranged in a water tank, the dosage rate at the position is large, the working time of personnel is long, and the total irradiation measurement is large.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model lies in providing a quick centering device for reactor head cover hoist of realizing the quick centering of head cover hoist and pressure vessel top cap.

The utility model provides a technical scheme that its technical problem adopted is: the quick centering device for the reactor head cover lifting tool comprises a positioning block, two limiting plates and a distance adjusting assembly, wherein the positioning block is placed between two opposite lug plates of a lifting lug on a pressure vessel head cover, the two limiting plates are arranged on two opposite sides of the positioning block and abut against the end faces of the lug plates, and the distance adjusting assembly is connected with the positioning block and the limiting plates and is used for adjusting the distance between the positioning block and the limiting plates;

the positioning block comprises a first surface facing a bottom plate of a lifting lug on a top cover of the pressure vessel and a second surface opposite to the first surface; and the second surface is provided with an inwards concave arc-shaped surface matched with the end surface of the lifting lug of the top cover lifting appliance.

Preferably, the quick centering device further comprises several sets of height adjusting components arranged on the first surface of the positioning block and used for adjusting the height of the positioning block on the bottom plate.

Preferably, the height adjusting assembly comprises a screw hole arranged on the first surface and a bolt matched with the screw hole.

Preferably, the quick centering device comprises four groups of the height adjusting assemblies which are distributed at intervals.

Preferably, the distance adjustment assembly comprises a cooperating screw and nut; the screw rod is connected on the side of positioning block, the limiting plate cover is established on the screw rod and can follow the axial round trip movement of screw rod, the nut cooperation is in on the screw rod and be located the limiting plate is kept away from one side of positioning block.

Preferably, the limiting plate is provided with a through hole for the screw rod to penetrate through.

Preferably, the screw is provided with a key groove extending along the axial direction of the screw; the inner wall of the through hole is provided with a bulge matched in the key groove.

Preferably, the limiting plate is parallel to the side face corresponding to the positioning block.

Preferably, the limiting plate is a rectangular plate.

Preferably, the positioning block is a rectangular block.

The utility model discloses a quick centering device is installed on the top cap of pressure vessel, is used for the centering of reactor top cap hoist and pressure vessel top cap, can guarantee the quick centering of top cap hoist and fall and be connected with the pressure vessel top cap, can practice thrift 0.3H key path time, fundamentally has avoided the route delay because of centering difficulty leads to; the operation is simple, the labor input is reduced, and the labor intensity is reduced, so that the irradiated dose of personnel can be effectively reduced.

The utility model discloses a but quick centering device wide application in the centering and the installation of nuclear power plant's top cap hoist.

Drawings

The invention will be further explained with reference to the drawings and examples, wherein:

fig. 1 is a top view of a rapid centering device according to an embodiment of the present invention installed in a lifting lug of a pressure vessel head;

fig. 2 is a front view of a quick centering device according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a limiting plate in a fast centering device according to an embodiment of the present invention;

fig. 4 is a schematic side view of an adjusting block in a quick centering device according to an embodiment of the present invention.

Detailed Description

In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in fig. 1 and 2, the utility model discloses a quick centering device for reactor head hoist of an embodiment, including the piece of adjusting a position 10, set up at two limiting plates 20 of the relative both sides of piece of adjusting a position 10, connect piece of adjusting a position 10 and limiting plate 20 and be used for adjusting the distance adjusting part 30 of distance between piece of adjusting a position 10 and the limiting plate 20.

The utility model discloses install on pressure vessel's top cap during the use. The pressure vessel's top cap is equipped with the lug that the several is used for the top cap hoist to hang and connects, and each lug is including relative two otic placodes 1 that set up and be equipped with the lewis hole respectively, connect between two otic placodes 1 and fix the bottom plate on the top cap surface.

On the top cover of the pressure vessel, the positioning block 10 is placed between two opposite ear plates of the lifting lug, two limiting plates 20 are respectively located on two opposite sides of the lifting lug and abut against the end surfaces of the ear plates 1, the distance between each limiting plate 20 and the positioning block 10 is adjusted through a distance adjusting assembly 30, and the horizontal position of the positioning block 10 in the lifting lug is adjusted (as shown in fig. 1, the left-right moving position of the positioning block 10 is adjusted).

The positioning block 10 may be a block structure with various shapes, such as a rectangular block shown in fig. 1; the positioning block 10 can be made of high-strength steel. The positioning block 10 comprises a first surface 11 and a second surface 12 opposite to each other. The first surface 11 faces to a bottom plate of a lifting lug on the top cover of the pressure vessel and can be attached to the bottom plate; the second surface 12 faces the roof sling. When the pressure vessel top cover is hung and connected, the top cover lifting appliance is matched with the lifting lugs on the top cover by the lifting lugs at the end part of the lower lifting rod of the top cover lifting appliance, the end face of the lifting lugs of the top cover lifting appliance is usually an arc face, so that the lifting lugs of the top cover lifting appliance correspond to the lifting lugs of the top cover lifting appliance, and the second surface 12 is provided with an inwards concave arc face 13 matched with the end face of the lifting lugs of. In the present embodiment, the arc-shaped face 13 is provided on the entire second surface 12.

The two limit plates 20 are disposed on two opposite sides of the positioning block 10, and are parallel to the corresponding side surfaces of the positioning block 10. The two limit plates 20 can respectively move back and forth relative to the positioning block 10 through the distance adjusting assemblies 30. The position limiting plate 10 may have various shapes, for example, a rectangular plate as shown in fig. 3, and may be made of a high-strength steel plate.

In this embodiment, the distance adjustment assembly 30 includes a cooperating threaded rod 31 and nut 32. The screw 31 is connected to the side surface of the positioning block 10, the limiting plate 20 is sleeved on the screw 31 and can move back and forth along the axial direction of the screw 31, and the nut 32 is matched on the screw 31 and is located on one side, away from the positioning block 10, of the limiting plate 20. Specifically, the screw 31 is perpendicular to the side surface of the positioning block 10, and is fixed at one end to the side surface of the positioning block 10 by welding or the like. It will be appreciated that the threaded rod 31 may also be a bolt.

As shown in fig. 2 and 3, the stopper plate 20 is provided with a through hole 21 through which the screw 31 passes, the stopper plate 20 is sleeved on the screw 31 through the through hole 21 and can move back and forth axially on the screw 31, the nut 32 is screwed on the screw 31 to limit the stopper plate 20 on the screw 31, and the nut 32 rotates on the screw 31 to drive the stopper plate 20 to move axially on the screw 31.

Further, in order to limit the rotation of the limit plate 20 on the screw 31, the screw 31 is provided with a key groove 33 extending along the axial direction thereof, and the inner wall of the through hole 21 of the limit plate 20 is provided with a protrusion 22; the shape of the projection 22 conforms to the shape of the keyway 33. On the screw 31, the protrusion 22 of the limit plate 20 is fitted in the keyway 33, so that the limit plate 20 can move back and forth along the axial direction of the screw 31, but cannot rotate along the periphery of the screw 31, thereby limiting the rotation of the limit plate 20 and ensuring the stability of the limit plate 20 at the side of the positioning block 10.

Further, the utility model discloses a quick centering device still includes and is used for adjusting the array height-adjusting subassembly 40 of positioning block 10 height on the bottom plate of the lug of pressure vessel top cap. The plurality of sets of height adjustment assemblies 40 are disposed on the first surface 11 of the positioning block 10.

The height adjustment assembly 40 may include a screw hole 41 formed on the first surface 11 of the positioning block 10, and a bolt (not shown) engaged with the screw hole 41. A screw hole 41 extends from the first surface 11 to the inside of the positioning block 10, a bolt is screwed into the screw hole 41, and the height of the positioning block 10 on the bottom plate is adjusted by rotating the bolt to adjust the length of the bolt protruding out of the screw hole 41 (i.e. protruding out of the first surface 11).

With reference to fig. 2 and 4, the quick centering device of the present embodiment includes four sets of height adjusting assemblies 40 distributed at intervals. Two groups of the positioning blocks are distributed on two sides of one end of the positioning block 10, and the other two groups of the positioning blocks are distributed on two sides of the other end of the positioning block 10. Alternatively, the bolt of the height adjustment assembly 40 may be an M10 bolt.

The utility model discloses a quick centering device is applicable to in the nuclear power plant's of labour reactor quick centering between top cap hoist and the pressure vessel top cap and hangs and connect. When carrying out the quick centering, correspond three lug on the pressure vessel top cap, adopt three sets the utility model discloses a quick centering device, one set of quick centering device of each lug installation.

During installation, a plurality of bolts are screwed into the screw holes 41 of the positioning block 10 in advance, and the positioning block 10 is placed between the two lug plates 1 of the lifting lug on the top cover of the pressure vessel. The two limit plates 20 are respectively sleeved into the screw 31 by aligning the protrusions 22 with the key grooves 33, and the two limit plates 20 are clamped at two opposite ends of the ear plate 1. Finally, the nut 32 is screwed into the screw 31 to complete the installation of the quick centering device.

During adjustment, a worker can adjust the bolt below the positioning block 10 by using a wrench, and the height of the positioning block 10 is adjusted by using thread transmission, so that the lowest point of the arc-shaped surface 13 on the positioning block 10 is flush with the lowest point of the arc-shaped end surface on the lifting lug of the top cover lifting appliance. The worker can manually rotate the nuts 32 of the two groups of distance adjusting assemblies 30, and the positioning block 10 is moved left and right by utilizing thread transmission until the arc-shaped surface 13 on the positioning block 10 is completely overlapped with the arc-shaped end surface of the lifting lug of the top cover lifting appliance. And (5) finishing the adjustment.

When the top cover lifting appliance is connected with the top cover of the pressure vessel, the lifting lugs of the top cover lifting appliance can be quickly aligned with the quick centering device on the top cover of the pressure vessel and fall, the lifting lugs of the top cover lifting appliance can be supported on the arc-shaped surface 10 of the positioning block 10, meanwhile, the lifting holes in the lifting lugs of the top cover lifting appliance are aligned with the lifting holes of the lifting appliance on the top cover of the pressure vessel, the top cover lifting appliance can be connected with the top cover of the pressure vessel by inserting pins into the aligned lifting holes, and the top cover of the pressure vessel can be lifted away through the top cover lifting. And when the cover is closed, the pressure container top cover is hoisted back to remove the top cover lifting appliance, and then the quick centering device is removed.

After the top cover lifting appliance rapidly falls down, if the position of the positioning block 10 changes, the nuts 32 of the two groups of distance adjusting assemblies 30 can be adjusted by using a 28# open wrench, so that the lifting lugs of the top cover lifting appliance are completely attached to the positioning block 10.

In the adjustment, the adjustment can be completed by only two persons at most, and compared with the prior art that the adjustment is performed by using crowbars and the like, the adjustment needs 3 persons at least, so that the investment of personnel is reduced. Meanwhile, the adjustment operation is simple, the time consumption is short, the labor intensity of personnel is reduced compared with the adjustment in the prior art, the irradiated dose of the personnel is effectively reduced, and the safety is higher.

The above only is the embodiment of the present invention, not limiting the patent scope of the present invention, all the equivalent structures or equivalent processes that are used in the specification and the attached drawings or directly or indirectly applied to other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A quick centering device for a reactor head cover lifting tool is characterized by comprising a positioning block, two limiting plates and a distance adjusting assembly, wherein the positioning block is placed between two opposite lug plates of a lifting lug on a pressure vessel head cover;

2. The quick centering device according to claim 1, further comprising sets of height adjusting components disposed on the first surface of the positioning block for adjusting the height of the positioning block on the base plate.

3. The quick centering device of claim 2, wherein said height adjustment assembly comprises a threaded hole disposed on said first surface, a bolt mating with said threaded hole.

4. The quick centering device of claim 2, wherein said quick centering device comprises four sets of said height adjustment assemblies spaced apart.

5. The quick centering device of any one of claims 1 to 4, wherein said distance adjustment assembly comprises a cooperating threaded rod and nut; the screw rod is connected on the side of positioning block, the limiting plate cover is established on the screw rod and can follow the axial round trip movement of screw rod, the nut cooperation is in on the screw rod and be located the limiting plate is kept away from one side of positioning block.

6. The quick centering device according to claim 5, wherein the limiting plate is provided with a through hole for the screw to pass through.

7. The quick centering device of claim 6, wherein said threaded rod is provided with a keyway extending axially therealong; the inner wall of the through hole is provided with a bulge matched in the key groove.

8. The quick centering device of any one of claims 1 to 4, wherein the limiting plate is parallel to the corresponding side of the positioning block.

9. The quick centering device of any one of claims 1 to 4, wherein the limiting plate is a rectangular plate.

10. The quick centering device of any one of claims 1 to 4, wherein said positioning block is a rectangular block.