CN112071458A - Fuel rod extraction device - Google Patents
Fuel rod extraction device Download PDFInfo
- Publication number
- CN112071458A CN112071458A CN202010827026.9A CN202010827026A CN112071458A CN 112071458 A CN112071458 A CN 112071458A CN 202010827026 A CN202010827026 A CN 202010827026A CN 112071458 A CN112071458 A CN 112071458A
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- rod
- positioning
- core rod
- outer sleeve
- fuel
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C19/00—Arrangements for treating, for handling, or for facilitating the handling of, fuel or other materials which are used within the reactor, e.g. within its pressure vessel
- G21C19/02—Details of handling arrangements
- G21C19/10—Lifting devices or pulling devices adapted for co-operation with fuel elements or with control elements
- G21C19/105—Lifting devices or pulling devices adapted for co-operation with fuel elements or with control elements with grasping or spreading coupling elements
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C19/00—Arrangements for treating, for handling, or for facilitating the handling of, fuel or other materials which are used within the reactor, e.g. within its pressure vessel
- G21C19/20—Arrangements for introducing objects into the pressure vessel; Arrangements for handling objects within the pressure vessel; Arrangements for removing objects from the pressure vessel
- G21C19/207—Assembling, maintenance or repair of reactor components
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Monitoring And Testing Of Nuclear Reactors (AREA)
Abstract
The invention relates to a fuel rod extraction device, which comprises a hoisting piece connected with hoisting equipment and an extraction execution mechanism connected with the hoisting piece; the extraction executing mechanism comprises a core rod, an outer sleeve and a gripper assembly, wherein one end of the core rod is connected with the hoisting piece, the outer sleeve is sleeved on the periphery of the core rod and can axially move back and forth along the core rod, and the gripper assembly is connected to one end, far away from the hoisting piece, of the core rod and can be opened and closed along with the movement of the outer sleeve. The fuel rod extracting device can rapidly, efficiently and safely extract the fuel rods (or stainless steel rods) from the fuel assembly (or simulation assembly) grillwork, so that the operation time of field personnel is shortened, the working efficiency is improved, and the equipment damage risk and the personnel injury risk are reduced. The rod pulling operation is carried out, so that the equipment safety can be increased, and the risk of field operation and the risk of foreign body introduction are reduced. Meanwhile, the fuel rod extracting device is simple in mechanical structure, stable in mechanical performance and convenient to transport.
Description
Technical Field
The invention relates to the technical field of assembly of reactor components, in particular to a fuel rod extraction device.
Background
In the nuclear power field, the fuel rod among the fuel assembly need be taken out the change under the maintenance condition of examining and repairing, and the single stick repair equipment that present nuclear power station used can carry out the single stick of spentnuclear subassembly and pull out excellent work more complicated, but equipment operation is complicated, has higher requirement to operating personnel skill: the equipment is numerous and complicated, and the transportation and installation time of the equipment is long; after the rod is pulled out, the fuel rod can be released only in the temporary storage container, and the single-rod pulling operation time is long.
In addition, relevant simulation experiments need to be carried out for pulling out simulation fuel rods (stainless steel rods and the like) in the simulation fuel assembly, and at present, no mature feasible scheme exists on the site.
Disclosure of Invention
The invention aims to provide a fuel rod extraction device.
The technical scheme adopted by the invention for solving the technical problems is as follows: constructing a fuel rod extraction device, which comprises a hoisting piece connected with hoisting equipment and an extraction executing mechanism connected with the hoisting piece;
the extraction executing mechanism comprises a core rod, an outer sleeve and a gripper assembly, wherein one end of the core rod is connected with the hoisting piece, the outer sleeve is sleeved on the periphery of the core rod and can axially move back and forth along the core rod, and the gripper assembly is connected to one end, far away from the hoisting piece, of the core rod and can be opened and closed along with the movement of the outer sleeve.
Preferably, the hoisting member comprises a positioning member, a hoisting ring rotatably connected to the circumferential side surface of the positioning member, and a first positioning rod vertically arranged on the bottom surface of the positioning member, extending downwards and connected with the core rod.
Preferably, the core rod comprises a core rod main body, a first positioning cylinder is arranged at the first end of the core rod main body, and an internal thread is arranged on the first positioning cylinder;
the periphery of first locating lever is equipped with the external screw thread, and two threaded connection.
Preferably, the gripper assembly comprises a connecting rod and a gripper arranged at the end of the connecting rod;
a second positioning rod is arranged at the second end of the core rod main body, the diameter of the positioning rod is smaller than that of the core rod main body, and external threads are arranged on the periphery of the second positioning rod;
a second positioning cylinder is arranged at one end, far away from the gripper, of the connecting rod, and an internal thread is arranged in the second positioning cylinder;
the second positioning rod is in threaded connection with the second positioning cylinder, and after connection, the peripheral side face of the core rod main body is flush with the peripheral side face of the connecting rod, so that the outer sleeve can axially move back and forth on the peripheries of the core rod main body and the connecting rod.
Preferably, the gripper comprises a plurality of movable arms connected with the connecting rod, and movable gaps are reserved between adjacent movable arms;
one end of the movable arm, which is far away from the connecting rod, is provided with a clamping part, and the clamping part is of an inwards bent finger-shaped structure;
the clamping part comprises a first clamping unit, a second clamping unit and a third clamping unit, wherein the first clamping unit is connected with the movable arm and extends downwards outwards and downwards, the second clamping unit is connected with the first clamping unit and extends downwards, the third clamping unit is connected with the second clamping unit and extends downwards and inwards, and barbs are arranged on the inner side of the third clamping unit.
Preferably, the connecting rod is provided with a plurality of notches for operating the wrench.
Preferably, the outer sleeve is a hollow pipe body structure;
the radial side surface of the outer sleeve is provided with a limiting hole which penetrates through the outer surface and the inner surface of the outer sleeve and extends along the axial direction;
and the core bar main body is also provided with a locking assembly which is positioned in the limiting hole and used for assisting in fixing the outer sleeve.
Preferably, the limiting hole comprises a first limiting hole unit extending to one side of the hoisting piece and a second limiting hole unit extending to one side of the gripper assembly;
the locking assembly comprises a lock sleeve and a fastener, wherein the fastener penetrates through the lock sleeve to limit the lock sleeve on the core rod main body, and the lock sleeve can axially move back and forth along the fastener to assist in fixing the outer sleeve;
when the gripper assembly clamps an upper end plug of a fuel rod, the outer sleeve moves, the locking assembly is located in the first limiting hole unit, and the outer sleeve presses against the clamping part to enable the gripper assembly to be in a clamping state;
when the gripper assembly releases the fuel rod, the outer sleeve moves and the locking assembly is located in the second limiting hole unit, so that the gripper assembly is in an active state.
Preferably, the lock sleeve comprises a positioning plate and a positioning column connected with the positioning plate, the positioning plate and the positioning column are coaxial, and a bolt-on through hole penetrating through the surfaces of the positioning plate and the positioning column along the axis of the positioning plate and the positioning column;
the fastener comprises a pin, a bolt and a cylindrical pin, and the pin penetrates through the bolt through hole and is installed in a positioning hole in the core rod main body so as to install the locking assembly on the core rod;
the surface of the positioning plate covers the limiting hole.
Preferably, the radial side surface of the outer sleeve is also provided with a guide groove which penetrates through the outer surface and the inner surface of the outer sleeve, is communicated with the limiting hole and extends to a position close to the primary opening of the hanging and connecting piece;
when the outer sleeve is withdrawn from the core rod, the guide groove forms a channel for avoiding the locking component.
The implementation of the invention has the following beneficial effects: the fuel rod extracting device can rapidly, efficiently and safely extract the fuel rods (or stainless steel rods) from the fuel assembly (or simulation assembly) grillwork, so that the operation time of field personnel is shortened, the working efficiency is improved, and the equipment damage risk and the personnel injury risk are reduced. The rod pulling operation is carried out, so that the equipment safety can be increased, and the risk of field operation and the risk of foreign body introduction are reduced.
Meanwhile, the fuel rod extracting device is simple in mechanical structure, stable in mechanical performance and convenient to transport.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic structural view of a fuel rod 100;
fig. 2 is a schematic structural view of the upper end plug 102 of fig. 1;
FIG. 3 is a schematic view of a fuel rod grabbed by the fuel rod extraction device of the present invention;
FIG. 4 is a schematic structural view of a fuel rod extraction device of the present invention;
FIG. 5 is a schematic view of the construction of the suspension element 1 according to the invention;
FIG. 6 is a schematic structural view of a core rod 2 according to the present invention;
FIG. 7 is a schematic structural view of the outer tube 3 of the present invention;
fig. 8 is a schematic view of the construction of the gripper assembly 4 of the present invention;
FIG. 9 is a schematic view of the construction of the gripper 42 of the present invention;
FIG. 10 is a schematic view of the assembled crane attachment 1, core rod 2 and gripper assembly 4 of the present invention;
FIG. 11 is a schematic structural view of the locking assembly 5 of the present invention;
fig. 12 is a schematic structural view of the lock case 51 of the present invention;
fig. 13 is a schematic view of the construction of the fastener 52 of the present invention.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings. In the following description, it is to be understood that the orientations and positional relationships indicated by "front", "rear", "upper", "lower", "left", "right", "longitudinal", "lateral", "vertical", "horizontal", "top", "bottom", "inner", "outer", "leading", "trailing", and the like are configured and operated in specific orientations based on the orientations and positional relationships shown in the drawings, and are only for convenience of describing the present invention, and do not indicate that the device or element referred to must have a specific orientation, and thus, are not to be construed as limiting the present invention.
It is also noted that, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," "disposed," and the like are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. When an element is referred to as being "on" or "under" another element, it can be "directly" or "indirectly" on the other element or intervening elements may also be present. The terms "first", "second", "third", etc. are only for convenience in describing the present technical solution, and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated, whereby the features defined as "first", "second", "third", etc. may explicitly or implicitly include one or more of such features. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
As shown in fig. 1-2, it is a schematic structural diagram of a fuel rod 100 or a simulation rod (stainless steel rod), which is a fuel assembly unit, and includes a fuel cladding 101 in a rod-like structure, in which fuel pellets are provided in the fuel cladding 101, an upper end plug 102 is provided at the upper end, and a lower end plug 103 is provided at the lower end.
As shown in fig. 3 to 4, the fuel rod extraction device of the present embodiment includes a hanger 1 for connecting to a lifting apparatus, and an extraction actuator connected to the hanger 1.
The extraction executing mechanism comprises a core bar 2, an outer sleeve 3 and a gripper assembly 4, wherein one end of the core bar 2 is connected with the hoisting piece 1, the outer sleeve 3 is sleeved on the periphery of the core bar 2 and can axially move back and forth along the core bar 2, and the gripper assembly 4 is connected to one end, far away from the hoisting piece 1, of the core bar 2 and can be opened and closed along with the movement of the outer sleeve 3.
As shown in fig. 5, the hanging member 1 includes a positioning member 11, a hanging ring 12 rotatably connected to a circumferential side surface of the positioning member 11, and a first positioning rod 13 vertically disposed on a bottom surface of the positioning member 11 and extending downward and connected to the core rod 2. The positioning member 11 is substantially a flat cylinder structure, the first positioning rod 13 is a cylindrical rod structure, the two are coaxial, and the diameter of the first positioning rod 13 is slightly smaller than that of the positioning member 11. The hanging ring 12 is connected with a steel wire rope and then hung on an auxiliary crane hook, and is a hanging point of the device.
Referring to fig. 6, the core rod 2 includes a core rod main body 21, the core rod main body 21 is substantially a cylindrical structure, a first end of the core rod main body 21 is provided with a first positioning cylinder 211, the first positioning cylinder 211 is provided with an internal thread, and correspondingly, the periphery of the first positioning rod 13 is provided with an external thread, and the two are connected by the thread. The outer surface of the connected core rod main body 21 is approximately flush with the positioning member 11.
Of course, a sleeve may be provided at the lower portion of the positioning member 11, the first end of the core rod main body 21 is provided with a positioning column, the diameter of the positioning column is slightly smaller than the diameter of the core rod main body 21, the sleeve is sleeved on the positioning column to mount the suspension connection member 1 on the core rod 2, and the outer surface of the connected core rod main body 21 is substantially flush with the positioning member 11. Furthermore, the inner wall of the sleeve is provided with threads, the periphery of the positioning column is also correspondingly provided with threads, and the positioning column are in threaded connection.
With reference to fig. 6 and 8, the aforementioned gripper assembly 4 includes a connecting rod 41 and a gripper 42 disposed at an end of the connecting rod 41, a second positioning rod 212 is disposed at a second end of the core rod body 21, a diameter of the positioning rod is smaller than a diameter of the core rod body 21, an external thread is disposed on an outer periphery of the second positioning rod 212, a second positioning cylinder 411 is disposed at an end of the connecting rod 41 away from the gripper 42, an internal thread is disposed in the second positioning cylinder 411, the second positioning rod 212 is in threaded connection with the second positioning cylinder 411, and after connection, an outer peripheral side surface of the core rod body 21 is flush with an outer peripheral side surface of the connecting rod 41, so that the outer sleeve 3 axially moves back and forth around the outer periphery.
Correspondingly, the second end of the core rod main body 21 may be provided with a positioning cylinder, and the first end of the connecting rod 41 may be provided with a positioning rod, which may be in threaded connection.
Further, the connecting rod 41 is provided with a plurality of notches 412 for operating a wrench. There may be two symmetrically disposed opposite sides of the connecting rod 41, which form the wrench tightening and loosening force points.
With reference to fig. 8 and 9, the gripper 42 includes a plurality of movable arms 421 connected to the connecting rod 41, a movable gap is left between adjacent movable arms 421, a clamping portion 422 is disposed at one end of the movable arm 421 away from the connecting rod 41, and the clamping portion 422 is a finger-shaped structure bending inward.
The clamping portion 422 comprises a first clamping unit 4221 connected with the movable arm 421 and extending outwards and downwards in a downward inclined mode, a second clamping unit 4222 connected with the first clamping unit 4221 and extending downwards, a third clamping unit 4223 connected with the second clamping unit 4222 and extending downwards and inwards, and barbs 4224 are arranged on the inner side of the third clamping unit 4223. It will be appreciated that the configuration of the clamping portion 422 is adapted to the configuration of the upper end plug 102 of the fuel rod 100 to clamp the upper end plug 102 and thereby capture and move the fuel rod 100.
As shown in fig. 10, after the suspension joint 1, the core rod 2 and the gripper assembly 4 are connected, the surfaces are relatively flush, so that the outer sleeve 3 can be sleeved and can slide along the outer surface.
As shown in fig. 7, the outer sleeve 3 is a hollow tube, the radial side of the outer sleeve 3 is provided with a limiting hole 31 penetrating through the outer surface and the inner surface and extending along the axial direction, and correspondingly, the core rod main body 21 is further provided with a locking assembly 5 located in the limiting hole 31 for assisting in fixing the outer sleeve 3.
Further, the limiting hole 31 includes a first limiting hole unit 311 extending to one side of the hanging member 1 and a second limiting hole unit 312 extending to one side of the gripper assembly 4, and it can be understood that the limiting hole 31 is substantially in a dumbbell shape and extends along the height direction of the outer sleeve 3.
Furthermore, the radial side surface of the outer sleeve 3 is also provided with a guide groove 32 which penetrates through the outer surface and the inner surface of the outer sleeve, is communicated with the limiting hole 31 and extends to the opening close to one side of the hanging and connecting piece 1, the guide groove 32 is approximately in an L-shaped structure, and when the outer sleeve 3 is withdrawn from the core rod 2, the guide groove 32 forms a channel for avoiding the locking component 5. Therefore, the locking component is used for rotatably sliding out of the outer sleeve 3 during installation and removal, so that part disassembly and assembly (without disassembling and assembling the locking component 5) are reduced, and foreign matter introduction risks are reduced.
As shown in fig. 11-13, the locking assembly 5 includes a locking sleeve 51 and a fastener 52 passing through the locking sleeve 51 to be fixed on the core rod main body 21, and the locking sleeve 51 can move back and forth along the fastener 52 to assist in fixing the outer sleeve 3.
In this embodiment, after the gripper assembly 4 clamps the upper end plug 101 of the fuel rod, the outer sleeve 3 moves and the locking assembly 5 is located in the first limiting hole unit 311, and the outer sleeve 3 presses the clamping portion 422, so that the gripper assembly 4 is in a clamping state.
When the gripper assembly 4 releases the fuel rod, the outer sleeve 3 moves and the locking assembly 5 is located in the second limiting hole unit 312, so that the gripper assembly 4 is in an active state.
In some embodiments, the limiting hole 31 may also be substantially in a "Z" shape, and includes a first transverse hole and a second transverse hole parallel to each other, the first transverse hole is disposed near one side of the hanging member 1, the second transverse hole is disposed far from one side of the hanging member 1, the first transverse hole and the second transverse hole extend in opposite directions, and a vertical hole perpendicularly connected to the first transverse hole and the second transverse hole. It will be appreciated that the cross bore may cooperate with the locking assembly 5 to limit displacement of the outer sleeve 3 in the locked condition. Of course, the limiting hole 31 may also be an I-shaped structure, and the structure may have various forms. And is not particularly limited herein.
After the gripper assembly 4 clamps the upper end plug 101 of the fuel rod, the outer sleeve 3 moves and the locking assembly 5 is located in the first transverse hole, and the outer sleeve 3 presses against the clamping portion 422, so that the gripper assembly 4 is in a clamping state.
When the gripper assembly 4 releases the fuel rod, the outer sleeve 3 moves and the locking assembly 5 is located in the second cross-hole, so that the gripper assembly 4 is in an active state.
Further, the lock sleeve 51 includes a positioning plate 511 and a positioning post 512 connected to the positioning plate 511, the positioning plate 511 is substantially a flat cylinder structure, the positioning post 512 is substantially a cylinder structure, the positioning plate 511 and the positioning post 512 are coaxial, the positioning plate 511 and the positioning post 512 are provided with a bolt through hole penetrating through opposite surfaces of the positioning plate and the positioning post along an axis thereof, the fastener 52 includes a pin, a bolt and a cylindrical pin, the pin is inserted into the bolt through hole and is fitted into the positioning hole 213 (which may be a pin hole) of the core rod main body 21 to mount the locking assembly 5 on the core rod 2, and it can be understood that the lock sleeve 51 moves back and forth along an axial direction of the fastener 52 to.
Further, the positioning plate 511 covers the limiting hole 31.
In this embodiment, taking the simulation assembly as an example, the fuel rod extraction device is used as follows:
the preconditions are as follows: the simulation assembly is hoisted into the fuel basket of the new fuel elevator, and the upper pipe seat is removed.
1. The devices are connected in the following order: the auxiliary crane hook head, the LOAD CELL torque limiter and the fuel rod extraction device are arranged on the crane hook head;
2. the auxiliary crane is positioned above the rod to be pulled;
3. confirming that the fuel rod extraction device gripper 42 is in a released state;
4. the hook head of the auxiliary crane is lowered to enable the gripper 42 and the rod to be gripped to be in a grippable position;
5. operating the lock sleeve 51 to make the fuel rod extraction device in a locked state;
6. the auxiliary hoisting crane is inching to enable the gripper to slightly bring a little force, the auxiliary hoisting crane trolley is finely adjusted, and the fuel rod gripping device is in a vertical state;
7. slowly descending the new fuel elevator, observing the tension change of the LOAD CELL, and stopping operation in time when abnormal fluctuation exists until the rod to be grabbed is completely pulled out of the simulation assembly;
8. one operator grasps the pulled rod and the other operator operates the fuel rod extraction device to release the rod;
9. the operator transfers the pulled-out rod to a storage position;
10. and carrying out the next rod pulling operation of the rod to be pulled.
The application of fuel rod extraction device has following beneficial effect:
1) the mechanical structure is simple, and the mechanical performance is stable.
2) The instrument is small and exquisite, convenient transportation.
3) The operation is intuitive, simple and efficient, and the learning and the hands are easy.
4) The quick-wear part fuel rod gripper can be used repeatedly, and can be replaced quickly, so that the equipment cost is reduced.
5) The special tool is used for pulling the rod, so that the equipment safety can be increased, and the risk of field operation and foreign body introduction can be reduced.
6) The construction period is shortened, and the enterprise benefit is increased. Compared with single-rod repairing equipment, the device does not need to insert the pulled rod back into the temporary storage container, and the operation time is reduced by more than half.
It is to be understood that the foregoing examples, while indicating the preferred embodiments of the invention, are given by way of illustration and description, and are not to be construed as limiting the scope of the invention; it should be noted that, for those skilled in the art, the above technical features can be freely combined, and several changes and modifications can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention; therefore, all equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.
Claims (10)
1. A fuel rod extraction device is characterized by comprising a lifting connector (1) connected with lifting equipment and an extraction executing mechanism connected with the lifting connector (1);
the extraction executing mechanism comprises a core rod (2) with one end connected with the hoisting piece (1), an outer sleeve (3) sleeved on the periphery of the core rod (2) and capable of moving back and forth along the axial direction of the core rod (2), and a gripper assembly (4) connected to one end, far away from the hoisting piece (1), of the core rod (2) and capable of opening and closing along with the movement of the outer sleeve (3).
2. The fuel rod extraction device as recited in claim 1, characterized in that the suspension element (1) comprises a positioning element (11), a suspension ring (12) rotatably connected to a circumferential side surface of the positioning element (11), and a first positioning rod (13) vertically disposed on a bottom surface of the positioning element (11) and extending downward and connected to the core rod (2).
3. The fuel rod extraction device as recited in claim 2, characterized in that the core rod (2) comprises a core rod body (21), a first end of the core rod body (21) is provided with a first positioning cylinder (211), and the first positioning cylinder (211) is provided with an internal thread;
the periphery of the first positioning rod (13) is provided with external threads which are connected with each other through threads.
4. The fuel rod extraction device according to claim 3, characterized in that the gripper assembly (4) comprises a connecting rod (41) and a gripper (42) provided at the end of the connecting rod (41);
a second positioning rod (212) is arranged at the second end of the core rod main body (21), the diameter of the positioning rod is smaller than that of the core rod main body (21), and external threads are arranged on the periphery of the second positioning rod (212);
a second positioning cylinder (411) is arranged at one end, far away from the gripper (42), of the connecting rod (41), and internal threads are arranged in the second positioning cylinder (411);
the second positioning rod (212) is in threaded connection with the second positioning cylinder (411), and after connection, the peripheral side surface of the core rod main body (21) is flush with the peripheral side surface of the connecting rod (41), so that the outer sleeve (3) can move back and forth along the axial direction on the peripheries of the core rod main body (21) and the connecting rod (41).
5. The fuel rod extraction device according to claim 4, characterized in that the gripper (42) comprises several movable arms (421) connected to the connecting rod (41), with a movable gap remaining between adjacent movable arms (421);
one end of the movable arm (421), which is far away from the connecting rod (41), is provided with a clamping part (422), and the clamping part (422) is of an inwards bent finger-shaped structure;
the clamping portion (422) comprises a first clamping unit (4221) which is connected with the movable arm (421) and extends outwards and downwards in a downward inclined mode, a second clamping unit (4222) which is connected with the first clamping unit (4221) and extends downwards, a third clamping unit (4223) which is connected with the second clamping unit (4222) and extends downwards and inwards, and barbs (4224) are arranged on the inner side of the third clamping unit (4223).
6. The fuel rod extraction device according to claim 4, characterized in that the connecting rod (41) is provided with a plurality of notches (412) for wrench operation.
7. The fuel rod extraction device according to claim 5, characterized in that the outer jacket tube (3) is a hollow tube structure;
the radial side surface of the outer sleeve (3) is provided with a limiting hole (31) which penetrates through the outer surface and the inner surface of the outer sleeve and extends along the axial direction;
the core bar main body (21) is also provided with a locking component (5) which is positioned in the limiting hole (31) and is used for assisting in fixing the outer sleeve (3).
8. The fuel rod extraction device as recited in claim 7, wherein the limiting hole (31) includes a first limiting hole unit (311) extending toward the hanger (1) side and a second limiting hole unit (312) extending toward the gripper assembly (4) side;
the locking assembly (5) comprises a lock sleeve (51) and a fastener (52) which is arranged on the lock sleeve (51) in a penetrating way to limit the lock sleeve on the core rod main body (21), and the lock sleeve (51) can axially move back and forth along the fastener (52) to assist in fixing the outer sleeve (3);
when the gripper assembly (4) clamps the upper end plug (101) of the fuel rod, the outer sleeve (3) moves, the locking assembly (5) is located in the first limiting hole unit (311), and the outer sleeve (3) presses the clamping part (422) so that the gripper assembly (4) is in a clamping state;
when the gripper assembly (4) releases the fuel rod, the outer sleeve (3) moves and the locking assembly (5) is positioned in the second limiting hole unit (312), so that the gripper assembly (4) is in an active state.
9. The fuel rod extraction device according to claim 8, characterized in that the lock sleeve (51) comprises a positioning plate (511) and a positioning column (512) connected to the positioning plate (511), the positioning plate (511) and the positioning column (512) being coaxial and being provided with a threaded through hole along their axes through their opposite surfaces;
the fastener (52) comprises a pin, a bolt and a cylindrical pin, penetrates through the threaded through hole and is installed in a positioning hole (213) in the core rod main body (21) to install the locking assembly (5) on the core rod (2);
the surface of the positioning plate (511) covers the limiting hole (31).
10. The fuel rod extraction device according to claim 8, characterized in that the radial side of the outer sleeve (3) is further provided with a guide groove (32) penetrating through the outer surface and the inner surface thereof, communicating with the limiting hole (31), and extending to a position close to the primary opening of the hanger (1);
when the outer sleeve (3) is withdrawn from the core rod (2), the guide groove (32) forms a channel for avoiding the locking component (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010827026.9A CN112071458B (en) | 2020-08-17 | 2020-08-17 | Fuel rod extraction device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010827026.9A CN112071458B (en) | 2020-08-17 | 2020-08-17 | Fuel rod extraction device |
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| Publication Number | Publication Date |
|---|---|
| CN112071458A true CN112071458A (en) | 2020-12-11 |
| CN112071458B CN112071458B (en) | 2023-04-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010827026.9A Active CN112071458B (en) | 2020-08-17 | 2020-08-17 | Fuel rod extraction device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114407058A (en) * | 2022-01-24 | 2022-04-29 | 上海第二工业大学 | Multipurpose reducing grabbing device |
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| US6320922B1 (en) * | 1999-05-07 | 2001-11-20 | General Electric Company | Tool for retracting fuel rods from and inserting fuel rods into a nuclear fuel assembly and methods therefor |
| CN103971768A (en) * | 2014-05-05 | 2014-08-06 | 华中科技大学 | Manipulator for replacing fuel rod based on distortion energy density theory |
| CN105225711A (en) * | 2015-10-14 | 2016-01-06 | 中科华核电技术研究院有限公司 | Fuel rod gripper test unit |
| CN111354491A (en) * | 2018-12-21 | 2020-06-30 | 核动力运行研究所 | Linkage type resistance plug assembly gripping apparatus |
-
2020
- 2020-08-17 CN CN202010827026.9A patent/CN112071458B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6320922B1 (en) * | 1999-05-07 | 2001-11-20 | General Electric Company | Tool for retracting fuel rods from and inserting fuel rods into a nuclear fuel assembly and methods therefor |
| CN103971768A (en) * | 2014-05-05 | 2014-08-06 | 华中科技大学 | Manipulator for replacing fuel rod based on distortion energy density theory |
| CN105225711A (en) * | 2015-10-14 | 2016-01-06 | 中科华核电技术研究院有限公司 | Fuel rod gripper test unit |
| CN111354491A (en) * | 2018-12-21 | 2020-06-30 | 核动力运行研究所 | Linkage type resistance plug assembly gripping apparatus |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114407058A (en) * | 2022-01-24 | 2022-04-29 | 上海第二工业大学 | Multipurpose reducing grabbing device |
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| CN112071458B (en) | 2023-04-07 |
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