CN111524621A

CN111524621A - Fuel assembly disassembly and assembly equipment

Info

Publication number: CN111524621A
Application number: CN202010186011.9A
Authority: CN
Inventors: 翟华东; 邢军; 卢冬华; 童刚; 彭帆
Original assignee: Longgang Branch Of China General Nuclear Power Research Institute Co ltd; China General Nuclear Power Corp; China Nuclear Power Technology Research Institute Co Ltd; CGN Power Co Ltd
Current assignee: Longgang Branch Of China General Nuclear Power Research Institute Co ltd; China General Nuclear Power Corp; China Nuclear Power Technology Research Institute Co Ltd; CGN Power Co Ltd
Priority date: 2020-03-16
Filing date: 2020-03-16
Publication date: 2020-08-11
Anticipated expiration: 2040-03-16
Also published as: CN111524621B

Abstract

The invention discloses fuel assembly and disassembly equipment which comprises a left workbench, a middle workbench, a right workbench, a supporting seat, a left traction mechanism, a right traction mechanism, a clamping mechanism, a rotating bracket and a supporting assembly. One of the left workbench and the right workbench and the middle workbench are respectively provided with a clamping mechanism, the clamping mechanism comprises a positioning mechanism with adjustable position and a fixing mechanism arranged on the positioning mechanism, the fixing mechanism on the middle workbench is used for clamping the fuel assembly, the fixing mechanism on the left workbench or the right workbench is used for clamping the support assembly, the supporting seat is detachably arranged on the middle workbench and is also positioned beside the clamping mechanism on the middle workbench, and the left traction mechanism and the right traction mechanism are matched with each other to realize the disassembly and assembly of the fuel rod between the grillwork and the support assembly of the fuel assembly; the requirement of hanging in or out of the high-precision fuel assembly is met, and the high-precision requirement of disassembling and assembling the fuel assembly is met.

Description

Fuel assembly disassembly and assembly equipment

Technical Field

The invention relates to the field of nuclear reactor test research, in particular to fuel assembly dismounting equipment which can meet the requirements of hanging in or out a fuel assembly with high precision, dismounting a fuel rod from the fuel assembly and assembling the fuel rod to the fuel assembly.

Background

Critical heat flux density tests, thermal diffusion coefficient measurement tests, flow heat transfer tests, pressure drop measurement tests and the like of fuel bundles of the fuel assembly are important bases for designing the fuel assembly of the nuclear power station, and the assembling and disassembling effects of the fuel bundles for experiments can directly influence the experiment results. Therefore, it is necessary to design a device for disassembling or assembling the fuel rod in the fuel assembly.

For example, the electric puller apparatus disclosed in chinese patent application No. 201611102276 includes a supporting mechanism, a guiding mechanism, a plurality of positioning mechanisms, a hanger plate assembly and a first electric actuator. The supporting mechanism comprises a first support which is horizontally arranged, the guiding mechanism comprises two guide rails which are parallel to each other and are arranged on the first support at intervals, a plurality of positioning mechanisms are respectively detachably connected to the two guide rails and are used for fixing the grid frame for fixing the fuel assembly on the two guide rails, the hanging plate assembly is arranged at one end of each guide rail and is provided with a guide hole corresponding to the rod penetrating hole in the grid frame, the heating rod of the fuel assembly is filled in or dismantled through the guide hole, and the first electric actuating mechanism is fixed at one end of the hanging plate assembly and is used for drawing the heating rod into the rod penetrating hole in the grid frame. Although the electric puller device can be used for assembling and disassembling the experimental heating rod bundle, the fuel assembly is a high-precision component, the requirement on the lifting technology is high, only a method for vertically lifting the upper tube seat of the fuel assembly can be adopted, and the electric puller device is not provided with a mechanism for lifting the fuel assembly in or out, so that the electric puller cannot meet the requirement for vertically lifting the high-precision fuel assembly in or out. Meanwhile, the positioning mechanism of the electric puller is connected to the guide rail in a sliding manner through the sliding block assembly, and the coaxiality of the positioning mechanism is ensured only by the connection of the sliding block assembly and the guide rail, so that the requirements on the disassembly and assembly of the fuel assembly with high disassembly and assembly precision are difficult to meet. Moreover, the first electric actuator of the electric puller device has no position adjusting function, so that the traction force of the first electric actuator deviates from the movement direction of the heating rod in the process of disassembling or assembling the fuel rod, and the risk of grid damage or surface scratch of the heating rod is increased.

Accordingly, a need exists for a fuel assembly disassembly apparatus that overcomes the above-mentioned deficiencies.

Disclosure of Invention

The invention aims to provide fuel assembly dismounting equipment which meets the requirements of hanging in or hanging out a high-precision fuel assembly and also meets the high-precision requirements of dismounting and assembling the fuel assembly.

In order to achieve the purpose, the fuel assembly disassembling and assembling device comprises a left workbench, a middle workbench, a right workbench, a supporting seat, a left traction mechanism, a right traction mechanism, a clamping mechanism, a rotating bracket for bearing the middle workbench and a supporting assembly for inserting and fixing fuel rods. The left workbench, the middle workbench and the right workbench are sequentially arranged in a linear manner at intervals along the left-right direction of the fuel assembly dismounting device, the middle workbench is pivoted with the rotating bracket around a horizontal pivot line, and the middle workbench has a lying position and a standing position relative to the rotating bracket in the process of turning up and down around the horizontal pivot line; the left traction mechanism is arranged on the left workbench, and the right traction mechanism is arranged on the right workbench; the clamping mechanism is respectively arranged on one of the left workbench and the right workbench and the middle workbench, the clamping mechanism comprises a positioning mechanism with an adjustable position and a fixing mechanism arranged on the positioning mechanism, the fixing mechanism on the middle workbench is used for clamping a fuel assembly, and the fixing mechanism on the left workbench or the right workbench is used for clamping the support assembly; the supporting seat is detachably mounted on the middle workbench, the supporting seat is further located beside a clamping mechanism on the middle workbench, the supporting seat is located right below the clamping mechanism on the middle workbench when the middle workbench is turned to the vertical position, and the left traction mechanism and the right traction mechanism are matched with each other to achieve dismounting of the fuel rods between the grillwork and the supporting assembly of the fuel assembly.

Preferably, the right traction mechanism pulls out and inserts the fuel rods in the grids of the fuel assemblies at the middle working platform into the support assemblies at the right working platform, and the left traction mechanism pulls out and inserts the fuel rods in the support assemblies at the right working platform into the grids of the fuel assemblies at the middle working platform; or the left traction mechanism pulls out and inserts the fuel rods in the grids of the fuel assemblies at the middle working table into the support assemblies at the left working table, and the right traction mechanism pulls out and inserts the fuel rods in the support assemblies at the left working table into the grids of the fuel assemblies at the middle working table.

Preferably, the supporting seat is selectively installed at the left end or the right end of the intermediate working table.

Preferably, when the intermediate workbench is turned from the lying position to the upright position counterclockwise and upwards, the supporting seat mounted at the left end of the intermediate workbench is located right below the clamping mechanism at the intermediate workbench, and when the intermediate workbench is turned from the lying position to the upright position clockwise and downwards, the supporting seat mounted at the right end of the intermediate workbench is located right below the clamping mechanism at the intermediate workbench.

Preferably, the supporting seat comprises a folded plate and reinforcing rib plates distributed on the front side and the rear side of the folded plate, the reinforcing rib plates are provided with lateral mounting holes which are penetrated through from front to back, and the folded plate is provided with bottom mounting holes which are penetrated through from top to bottom.

Preferably, the folded plate is in an L shape in projection in the front-back direction of the fuel assembly dismounting device.

Preferably, the fuel assembly disassembly and assembly device further comprises a traction wire and a clamp for clamping the fuel rod, wherein a first end of the traction wire is in assembly connection with the clamp, and a second end of the traction wire is selectively in detachable assembly connection with the left traction mechanism or the right traction mechanism.

Preferably, the head end of the clamp is provided with a diameter-changing structure which is arranged in an increasing manner from the head end to the tail end of the clamp, the tail end of the clamp is provided with a plurality of embracing arms which are spaced from each other and are circumferentially arranged into a circle, all the embracing arms jointly enclose a embracing cavity, and the first end of the pull wire is assembled and connected with the diameter-changing structure.

Preferably, the outer contour of the cross section of the clamp is circular, regular polygon or oval.

Preferably, the tail end of the clamp is divided equally in the circumferential direction to form the embracing arm.

Preferably, the diameter-variable structure is provided with a through hole penetrating through a side wall of the diameter-variable structure, and the first end of the pull wire penetrates through the through hole and is fixed with the corresponding part of the pull wire.

Preferably, the left traction mechanism and the right traction mechanism are respectively arranged in a position-adjustable manner, the left traction mechanism and the right traction mechanism respectively comprise a winding motor, a winder installed on an output end of the winding motor, and a position adjusting assembly for adjusting the position of the winding motor, the winding motor is installed on the position adjusting assembly, the output end of the winding motor is arranged along the front-back direction of the fuel assembly dismounting device, and the second end of the traction wire is wound on the winder.

Preferably, the left and right traction mechanisms further each comprise a stopper, the stopper being directly or indirectly mounted on the winding motor, the stopper having a guide channel aligned with the winder, the traction wire passing through the guide channel.

Preferably, the guide channel is a through hole, and the head end and/or the tail end of the through hole are/is provided with a chamfer structure.

Preferably, the position adjusting assembly comprises an upper support, a lower support, a horizontal support, a support plate, a horizontal stud, an upper stud, a lower stud, a horizontal guide rail, an upper guide rail and a lower guide rail, wherein the upper guide rail and the lower guide rail are mounted on the upper support and the lower support, the horizontal support is slidably mounted on the upper guide rail and the lower guide rail, the upper stud and the lower stud are rotatably mounted on the upper support and the lower support and are positioned beside the upper guide rail and the lower guide rail, the upper stud and the lower stud are further arranged in the horizontal support in a threaded transmission manner, the horizontal guide rail is arranged along the front-back direction of the fuel assembly disassembly and assembly equipment and is mounted on the horizontal support, the support plate is slidably mounted on the horizontal guide rail, the horizontal stud is arranged along the front-back direction of the fuel assembly disassembly and assembly equipment and is rotatably mounted on, the winding motor is mounted on the support plate.

Preferably, the rotating bracket includes a rotating shaft, a front support, a rear support, a first limiting baffle plate and a second limiting baffle plate, the front support and the rear support are aligned in tandem along the front-rear direction of the fuel assembly dismounting device, the front end of the rotating shaft is assembled at the front support, the rear end of the rotating shaft is assembled at the rear support, the first limiting baffle plate and the second limiting baffle plate are detachably mounted on the front support and/or the rear support, the middle workbench is fixedly connected to the rotating shaft, the middle workbench abuts against the first limiting baffle plate when being turned to the upright position in the counterclockwise direction from the lying position, and the middle workbench abuts against the second limiting baffle plate when being turned to the upright position in the clockwise direction from the lying position.

Preferably, the intermediate table spans above the rotary shaft in a left-right direction of the fuel assembly detaching device.

Preferably, the section of the middle section of the rotating shaft is square, the sections of the front end and the rear end of the rotating shaft are circular, and the middle workbench is fixedly connected with the middle section of the rotating shaft.

Preferably, the middle section of the rotating shaft is provided with a first positioning hole and a second positioning hole, the front support and/or the rear support is provided with a mating hole, the first positioning hole is aligned with the mating hole when the middle workbench is turned from the lying position to the upright position in an anticlockwise direction, and the second positioning hole is aligned with the mating hole when the middle workbench is turned from the lying position to the upright position in a clockwise direction.

Preferably, the left workbench comprises a supporting framework, an adjusting screw and a locking nut, the adjusting screw penetrates through the bottom of the supporting framework along the vertical direction of the fuel assembly dismounting device and is in threaded connection with the bottom, the locking nut is located above the bottom of the supporting framework, and the locking nut is further sleeved on the adjusting screw and is in threaded connection with the adjusting screw.

Preferably, the positioning mechanism comprises a portal bracket, a front trapezoidal block, a rear trapezoidal block, a front connecting block, a rear connecting block, a first front screw, a second front screw, a first rear screw and a second rear screw, the portal bracket is arranged along the front-rear direction of the fuel assembly disassembling and assembling device, the front connecting block is assembled and connected with the bottom of the front side of the portal bracket through the first front screw, the rear connecting block is assembled and connected with the bottom of the rear side of the portal bracket through the first rear screw, the front trapezoidal block is positioned behind the front side of the portal bracket, the front trapezoidal block is also assembled and connected with the front connecting block through the second front screw, the rear trapezoidal block is positioned in front of the rear side of the portal bracket, the rear trapezoidal block is also assembled and connected with the rear connecting block through the second rear screw, and the inclined planes of the front trapezoidal block and the rear trapezoidal block face each other, the fixing mechanism is installed at the top of the door-shaped support.

Preferably, the middle worktable comprises a support plate, a support frame, a base plate, an adjusting screw and a locking nut, the support plate has an inverted trapezoidal structure clamped between the front trapezoidal block and the rear trapezoidal block, the upper end of the support frame is assembled and connected with the support plate, the lower end of the support frame is assembled and connected with the base plate, the adjusting screw penetrates through the base plate along the vertical direction of the fuel assembly disassembling and assembling device and is in threaded connection with the base plate, the locking nut is located above the base plate, and the locking nut is further sleeved on the adjusting screw and is in threaded connection with the adjusting screw.

Preferably, the support plate comprises an upper support plate and a lower support plate stacked on each other, the upper support plate and the lower support plate are assembled and connected through a fastener, and the inverted trapezoid structure is formed on the upper support plate.

Preferably, the cross section of the upper supporting plate is a special-shaped section with an inverted trapezoid upper part and a rectangular lower part.

Preferably, the right workbench comprises a support plate, a support frame, a base plate, an adjusting screw and a locking nut, the support plate has an inverted trapezoidal structure clamped between the front trapezoidal block and the rear trapezoidal block, the upper end of the support frame is in assembly connection with the support plate, the lower end of the support frame is in assembly connection with the base plate, the adjusting screw penetrates through the base plate along the vertical direction of the fuel assembly dismounting device and is in threaded connection with the base plate, the locking nut is located above the base plate, and the locking nut is further sleeved on the adjusting screw and is in threaded connection with the adjusting screw.

Preferably, the support plate comprises an upper support plate and a lower support plate stacked on each other, the upper support plate and the lower support plate are assembled and connected through a fastener, the inverted trapezoidal structure is formed on the upper support plate, and the cross section of the upper support plate is a specially-shaped cross section with an inverted trapezoid shape at the upper part and a rectangular shape at the lower part.

Preferably, the fixing mechanism comprises a fixed clamping support and a movable clamping support which are in open-close fit with each other, the fixed clamping support and the movable clamping support are respectively arranged along the front-back direction of the fuel assembly dismounting device, the fuel assembly is clamped between the fixed clamping support and the movable clamping support of the middle workbench, and the supporting assembly is clamped between the fixed clamping support and the movable clamping support of the left workbench or the right workbench.

Preferably, the fixing mechanism further comprises a cushion block, a pressing block and a compression screw, the cushion block is mounted on the inner side of the fixed clamp support, the pressing block is located on the inner side of the movable clamp support and is in loose-clamp fit with the cushion block, the compression screw is rotatably arranged on the movable clamp support in a penetrating mode, the compression screw is further connected with the pressing block in an assembling mode, and the distance between the pressing block and the cushion block is adjusted through rotation of the compression screw.

Preferably, the movable clamping support comprises a cross beam and a vertical beam, a first end of the cross beam is hinged to a first end of the fixed clamping support, a first end of the vertical beam is hinged to a second end of the fixed clamping support, second ends of the cross beam and the vertical beam are detachably assembled and connected, the compression screws respectively and rotatably penetrate the cross beam and the vertical beam, and the compression screws of the cross beam and the vertical beam are respectively provided with the compression block.

Compared with the prior art, the supporting seat is positioned right below the clamping mechanism on the middle working table when the middle working table is overturned to the vertical position by means of the matching of the middle working table, the rotating bracket and the supporting seat, the supporting seat supports a tube seat in the fuel assembly which is vertically hoisted, and meanwhile, the fuel assembly is clamped and fixed by the fixing mechanism on the middle working table so as to meet the requirement of hoisting the high-precision fuel assembly in or out; meanwhile, the fixing mechanism of the clamping mechanism on the middle workbench is used for clamping the fuel assembly, the positioning mechanisms of the clamping mechanism on the middle workbench are arranged in a position-adjustable manner, the fixing mechanism of the clamping mechanism on the left workbench or the right workbench is used for clamping the supporting assembly, and the positioning mechanisms of the clamping mechanism on the left workbench or the right workbench are also arranged in a position-adjustable manner, so that the fuel assembly and the supporting assembly are accurately aligned with each other when the middle workbench is in a lying position, and then the left traction mechanism on the left workbench and the right traction mechanism on the right workbench are matched with each other, so that the high-precision disassembly and assembly of the fuel rods between the grillage and the supporting assembly of the fuel assembly are realized, and the high-precision requirements of the disassembly and assembly of the fuel assembly are met. In addition, the fuel assembly dismounting device can be used for maintaining the fuel assembly, replacing a pipe seat in the fuel assembly and meeting the requirement of directional requirements on the pulling out or the loading of a fuel rod.

Drawings

Fig. 1 is a schematic plan view of the fuel assembly attaching and detaching device of the present invention projected from front to back and having a support base mounted on the left end of an intermediate table.

Fig. 2 is a schematic plan view of the fuel assembly and disassembly apparatus shown in fig. 1, in which both the left traction mechanism and the left table are assembled together.

Fig. 3 is a schematic perspective view of a left traction mechanism in the fuel assembly detachment apparatus of the present invention.

Fig. 4 is a schematic plan view of the support base in the fuel assembly detachment apparatus of the present invention projected from right to left.

Fig. 5 is a schematic view of the internal structure of fig. 4 taken along line E-E.

Fig. 6 is a schematic structural plan view of the clamping mechanism in the fuel assembly dismounting device of the present invention, which is projected from left to right.

Figure 7 is a schematic plan view of the fixture of figure 6 after deformation.

Figure 8 is a schematic plan view of the chuck mechanism shown in figure 6 with the holding mechanism in an open position.

Fig. 9 is a schematic plan view of the fuel assembly dismounting device of the present invention, in which the middle table, the clamping mechanism and the rotating bracket are assembled together and projected from left to right.

Fig. 10 is a schematic plan view of a rotary holder projected from the front to the rear in the fuel assembly detachment apparatus of the present invention.

Fig. 11 is a schematic view of the rotary bracket shown in fig. 10 in a state where the second limit fence is removed and the rotary shaft is rotated 90 degrees counterclockwise upward.

Fig. 12 is a schematic view of the rotary bracket shown in fig. 10 in a state where the first limit stopper is removed and the rotary shaft is rotated clockwise and downward by 90 degrees.

Fig. 13 is a schematic plan view of the fuel assembly dismounting device of the present invention after the right workbench and the clamping mechanism are assembled together and projected from left to right.

Fig. 14 is a schematic plan view of the fixture in the fuel assembly disassembly and assembly apparatus of the present invention, projected from left to right.

Fig. 15 is a schematic view of the internal structure of fig. 14 taken along the line F-F.

Detailed Description

Embodiments of the present invention will now be described with reference to the drawings, wherein like element numerals represent like elements.

Referring to fig. 1, the fuel assembly detachment apparatus 100 of the present invention can vertically suspend an external fuel assembly 200 therein, or vertically suspend the fuel assembly 200 on the fuel assembly detachment apparatus 100 of the present invention outward, or detach the fuel rods 210 of the fuel assembly 200 suspended in the fuel assembly detachment apparatus 100 of the present invention, or assemble the fuel rods 210 in the grids 220 (see fig. 7) of the fuel assembly 200; the fuel assembly 200 includes fuel rods 210, a lattice 220, an upper tube seat and a lower tube seat, wherein the fuel rods 210 are inserted into rod through holes of the lattice 220; the lower nozzle is mounted to the lower end of the lattice 220 for covering the lower end of the rod penetration hole in the lattice 220 to prevent the fuel rod 210 from sliding down out of the lattice 220; and the upper nozzle is mounted to the upper end of the lattice 220 for covering the upper ends of the rod penetration holes in the lattice 220 to prevent the fuel rods 210 from sliding up out of the lattice 220; that is, the fuel rods 210 inserted into the rod through holes of the lattice 220 are securely fixed to the lattice 220 under the common stopper of the upper and lower nozzle. Since the structure of fuel assembly 200 is well known in the art, it will not be described in detail herein.

Referring to fig. 13, the fuel assembly dismounting device 100 of the present invention includes a left table 10, a middle table 20, a right table 30, a supporting seat 40, a left traction mechanism 50a, a right traction mechanism 50b, a clamping mechanism 60, a rotating bracket 70 for supporting the middle table 20, and a supporting assembly 80a for inserting and fixing a fuel rod 210. The left table 10, the middle table 20 and the right table 30 are sequentially arranged in a linearly spaced manner in the left-right direction of the fuel assembly disassembly and assembly apparatus 100 of the present invention, so that the left table 10, the middle table 20 and the right table 30 are aligned and spaced apart from each other, creating conditions for the turning of the middle table 20; the intermediate working platform 20 is pivotally connected to the rotary bracket 70 about a horizontal pivot line C, so that the intermediate working platform 20 has a lying position shown in fig. 1 and an upright position shown in fig. 11 or 12 with respect to the rotary bracket 70 during the process of being turned up and down about the horizontal pivot line C; the left traction mechanism 50a is arranged on the left workbench 10, and the left workbench 10 provides a supporting function for the left traction mechanism 50 a; the right traction mechanism 50b is arranged on the right workbench 30, and the right workbench 30 provides a supporting function for the right traction mechanism 50 b; the right workbench 30 and the middle workbench 20 are respectively provided with a clamping mechanism 60, and the clamping mechanisms 60 are respectively arranged on the left workbench 10 and the middle workbench 20 according to actual needs, so the invention is not limited thereto; the clamping mechanism 60 comprises a positioning mechanism 60a with an adjustable position and a fixing mechanism 60b arranged on the positioning mechanism 60a, preferably, the positioning mechanism 60a is arranged in a way that the position can be adjusted along the front-back direction of the fuel assembly dismounting device 100 of the invention, so that the fixing mechanism 60b can be adjusted adaptively through the position adjustment of the positioning mechanism 60a, and therefore, the coaxiality consistency of all the fixing mechanisms 60b is good; the fixing mechanism 60b on the middle workbench 20 is used for clamping the fuel assembly 200, so that the middle workbench 20 can better meet the high-precision requirement of vertical hanging-in or vertical hanging-out of the fuel assembly 200 when being turned to the vertical position around the horizontal pivot line C; the fixing mechanism 60b on the right workbench 30 is used for clamping the support assembly 80a so as to meet the dismounting and mounting of the fuel rod 210 between the fuel assembly 200 on the middle workbench 20 and the support assembly 80a on the right workbench 30; the supporting seat 40 is detachably mounted on the intermediate table 20, so that the supporting seat 40 is mounted on the intermediate table 20 or dismounted from the intermediate table 20 according to actual requirements; the supporting seat 40 is also located beside the clamping mechanism 60 on the middle worktable 20, and the supporting seat 40 is located right below the clamping mechanism 60 on the middle worktable 20 when the middle worktable 20 is turned to the upright position, so that the supporting surface 41a of the supporting seat 40 supports the tube seat below the fuel assembly 200 when the fuel assembly 200 is vertically hung, thereby ensuring the reliability of the vertical hanging of the fuel assembly 200. The left traction mechanism 50a and the right traction mechanism 50b cooperate with each other to achieve the attachment and detachment of the fuel rods 210 between the grids 220 of the fuel assembly 200 and the support assembly 80 a. Specifically, the right traction mechanism 50b pulls out and inserts the fuel rods 210 in the lattice 220 of the fuel assembly 200 at the middle working platform 20 into the support assembly 80a at the right working platform 30, so as to achieve the purpose of disassembling the fuel rods 210 in the fuel assembly 200; the left traction mechanism 50a pulls out and inserts the fuel rods 210 in the support assembly 80a at the right workbench 30 into the grids 220 of the fuel assembly 200 at the middle workbench 20, so as to achieve the purpose of assembling the fuel rods 210 in the fuel assembly 200. It can be understood that when the clamping mechanism 60 is installed on the left workbench 10 and the clamping mechanism 60 is not installed on the right workbench 30, correspondingly, the left traction mechanism 50a pulls out the fuel rods 210 in the grids 220 of the fuel assembly 200 at the middle workbench 20 and inserts the fuel rods 210 in the support assembly 80a at the left workbench 10, so as to achieve the purpose of disassembling the fuel rods 210 in the fuel assembly 200; meanwhile, the right traction mechanism 50b pulls out and inserts the fuel rods 210 in the support assembly 80a at the left workbench 10 into the grids 220 of the fuel assembly 200 at the middle workbench 20, so as to achieve the purpose of assembling the fuel rods 210 in the fuel assembly 200. More specifically, the following:

as shown in fig. 1, the backup pad 40 is selectively installed at the left or right end of the middle table 20, that is, the backup pad 40 is installed at the left or right end of the middle table 20 by disassembling and assembling the backup pad 40, so that the lower socket supporting the fuel assembly 200 when the fuel assembly 200 is loaded or unloaded is arranged, and the fuel rod 210 is disassembled when the fuel rod 210 is disassembled from the fuel assembly 200 or the fuel rod 210 is loaded into the fuel assembly 200, thereby better satisfying the requirement of the direction for drawing or loading the fuel rod 210. Specifically, when the intermediate table 20 is tilted counterclockwise and upward from the lying position to the standing position, the support seat 40 attached to the left end of the intermediate table 20 is positioned directly below the clamping mechanism 60 of the intermediate table 20, and when the intermediate table 20 is tilted clockwise and downward from the lying position to the standing position, the support seat 40 attached to the right end of the intermediate table 20 is positioned directly below the clamping mechanism 60 of the intermediate table 20, thereby satisfying the requirement of the direction of pulling out or loading the fuel rod 210 to the utmost. More specifically, in fig. 4 and 5, the supporting seat 40 includes a folded plate 41 and reinforcing ribs 42 distributed on the front side and the rear side of the folded plate 41, the reinforcing ribs 42 are formed with lateral mounting holes 421 penetrating forward and backward, preferably, the lateral mounting holes 421 are screw counter bores, the folded plate 41 is formed with bottom mounting holes 411 penetrating up and down, so that the supporting seat 40 is more reliably mounted on the intermediate table 20 through the lateral mounting holes 421 and the bottom mounting holes 411. For example, the flap 41 is projected in an "L" shape in the front-back direction of the fuel assembly detachment apparatus 100 of the present invention, so that the supporting base 40 is more reliably engaged with the stem of the fuel assembly 200, but not limited thereto. Notably, the support base 40 is used for supporting the fuel assembly 200, and the installation position thereof is determined by the hoisting requirement of the fuel assembly 200; if the middle worktable 20 is required to rotate 90 degrees counterclockwise for loading or unloading the fuel assembly 200, the supporting base 40 is installed at the left end of the middle worktable 20; if it is necessary to rotate the intermediate table 20 clockwise by 90 degrees to load or unload the fuel assembly 200, the support base 40 is installed at the right end of the intermediate table 20.

As shown in fig. 1, 14 and 15, the fuel assembly dismounting device 100 of the present invention further includes a pull wire 80b and a clamp 90 for clamping the fuel rod 210, wherein a first end of the pull wire 80b is connected to the clamp 90 in an assembling manner, and a second end of the pull wire 80b is selectively connected to the left traction mechanism 50a or the right traction mechanism 50b in a detachable assembling manner, that is, when the left traction mechanism 50a is required, the second end of the pull wire 80b is connected to the left traction mechanism 50a, and when the right traction mechanism 50b is required, the second end of the pull wire 80b is connected to the right traction mechanism 50b, so that the number of the pull wire 80b and the clamp 90 can be reduced. Specifically, the head end 90a of the clamp 90 is provided with a reducing structure 91 which is arranged in an increasing manner from the head end 90a to the tail end 90b of the clamp 90, the tail end 90b of the clamp 90 is provided with a plurality of encircling arms 92 which are spaced from each other and are arranged in a circle in the circumferential direction, preferably, the tail end 90b of the clamp 90 is divided into the encircling arms 92 in the circumferential direction in an equal division manner, all the encircling arms 92 jointly enclose an encircling cavity 93, and the first end of the traction wire 80b is assembled and connected with the reducing structure 91; the reducing structure 91 can guide the clamp 90 to pass through the grids 220 of the support assembly 80a and the fuel assembly 200, so as to prevent the clamp 90 from colliding and interfering with the grids 220 of the support assembly 80a and the fuel assembly 200, and meanwhile, the holding arm 92 can prevent the fuel rod 210 from sliding out of the clamp 90, thereby ensuring the reliability of the clamp 90 for the fuel rod 210. More specifically, the outer contour of the cross section of the clamp 90 is circular, so that the clamp 90 has a tubular structure, thereby simplifying the manufacturing process of the clamp 90, and of course, the outer contour of the cross section of the clamp 90 may also be a regular polygon or an ellipse according to actual needs, so that the invention is not limited thereto. In addition, the reducing structure 91 is provided with a through hole 94 penetrating through the side wall of the reducing structure 91, the first end of the pull wire 80b penetrates through the through hole 94 and then is fixed with the corresponding part of the pull wire 80b, preferably, the first end of the pull wire 80b penetrates through the through hole 94 and then is fixed with the corresponding part of the pull wire 80b through the pressing sleeve 95, so that the pull wire 80b is aligned with the center of the clamp 90, and the traction direction of the pull wire 80b to the clamp 90 is effectively ensured to be consistent with the sliding direction of the clamp 90. It should be noted that the cross section of the fixture 90 refers to a cross section of the fixture 90 cut by a plane perpendicular to the center line of the fixture 90; since the traction wire 80b is used to pull the movement of the clamp 90 and the fuel rod 210, the traction wire 80b has superior strength and toughness.

As shown in fig. 1 to 3, the left traction mechanism 50a and the right traction mechanism 50b are respectively arranged in a position adjustable manner, so that the positions of the left traction mechanism 50a and the right traction mechanism 50b have an adjustable function; since the left traction mechanism 50a and the right traction mechanism 50b have the same structure, only the structure of the left traction mechanism 50a will be described in detail, and the structure of the right traction mechanism 50b will be referred to the left traction mechanism 50a directly. Specifically, the left pulling mechanism 50a includes a winding motor 51, a reel 52 mounted on an output end 511 of the winding motor 51, and a position adjusting assembly 53 for adjusting the position of the winding motor 51; the winding motor 51 is mounted on the position adjusting assembly 53 to adjust the positions of the winding motor 51 and the reel 52 through the position adjusting assembly 53, preferably the width position and the up-down position of the winding motor 51 and the reel 52 on the left workbench 10, so as to satisfy the position requirement of each fuel rod 210 in the fuel assembly 200 for the left traction mechanism 50 a; the output end 511 of the winding motor 51 is disposed along the front-rear direction of the fuel assembly detaching device 100 of the present invention, and the second end of the traction wire 80b is wound on the reel 52, so that the space occupied by the left and

right traction mechanisms

50a and 50b is greatly reduced by means of the reel 52. Specifically, the left traction mechanism 50a further includes a stopper 54, the stopper 54 is indirectly mounted on the winding motor 51, specifically, mounted on the winding motor 51 through a support plate 533 described below, and of course, may also be directly mounted on the winding motor 51, so the invention is not limited thereto; the stopper 54 has a guide channel 54a aligned with the winder 52, and the pull wire 80b is inserted into the guide channel 54a to eliminate the influence of the deviation of the pull wire 80b wound on the winder 52 on the direction of the pulling force, thereby effectively ensuring that the direction of the pulling force is always consistent with the moving direction of the fuel rod 210. For example, the guiding channel 54a is a through hole, and the head end and/or the tail end of the through hole are/is provided with a chamfer structure to reduce the friction resistance of the pulling wire 80b, but not limited thereto. It should be noted that the position adjusting assembly 53 of the left pulling mechanism 50a is specifically mounted on the top of the left workbench 10, and the position adjusting assembly of the right pulling mechanism 50b is specifically mounted on the top of the right workbench. More specifically, the following:

as shown in fig. 2 and 3, the position adjustment assembly 53 includes an upper support 531, a lower support 532, a support plate 533, a horizontal stud 534, an upper stud 535, a lower stud 536, and an upper guide 537; the upper and lower guide rails 537 are mounted on the upper and lower support brackets 531, and the upper and lower support brackets 531 support the upper and lower guide rails 537, preferably, the upper and lower guide rails 537 are a guide pillar or guide rod structure, but not limited thereto; the upper and lower supports 531 are mounted on the left table 10; the horizontal support 532 is slidably arranged on the upper and lower guide rails 537, so that the horizontal support 532 can slide up and down along the upper and lower guide rails 537; the upper and lower studs 535 are rotatably mounted on the upper and lower supports 531 and located beside the upper and lower guide rails 537, and the upper and lower studs 535 are further threaded into the horizontal support 532, so that when the upper and lower studs 535 are rotated, the horizontal support 532 is driven by the rotated upper and lower studs 535 to slide up and down for adjustment; the horizontal rail 536 is disposed along the front-rear direction of the fuel assembly dismounting device 100 of the present invention and is mounted on the horizontal support 532, and the horizontal support 532 provides support for fixing the horizontal rail 536, preferably, the horizontal rail 536 is a guide pillar or guide rod structure, but is not limited thereto; the support plate 533 is slidably disposed on the horizontal rail 536, so that the support plate 533 can slide back and forth along the horizontal rail 536; the horizontal stud 534 is arranged along the front-back direction of the fuel assembly dismounting device 100, the horizontal stud 534 is rotatably arranged on the horizontal support 532 and is positioned at the side of the horizontal guide rail 536, the horizontal stud 534 is also penetrated in the support plate 533 in a threaded transmission manner, so that when the horizontal stud 534 is rotated, the support plate 533 is driven by the rotating horizontal stud 534 to slide back and forth; the winding motor 51 is mounted on the support plate 533 such that the winding motor 51 follows the support plate 533 to slide back and forth. Therefore, by the cooperation of the upper and lower studs 535 and the horizontal studs 534, the adjustment of the front and rear positions and the up and down positions of the winding motor 51 and the winder 52 along the fuel assembly disassembling and assembling apparatus 100 of the present invention can be adjusted, and the levelness of the middle table 20 and the right table 30 can be adjusted, thereby greatly improving the coaxiality of the fuel rods 210 and the grids 220 in the fuel assembly 200, and reducing damage to the grids 220 or scratching of the surfaces of the fuel rods 210. To ensure the adjustment effect and prevent the accidental loosening, the position adjustment assembly 53 further comprises a locking screw 538, the locking screw 538 is rotatably mounted on the upper and lower supports 531 and the horizontal support 532, the locking screw 538 at the upper and lower supports 531 is used for locking or unlocking the upper and lower studs 535, and the locking screw 538 at the horizontal support 532 is used for locking or unlocking the horizontal stud 534, but not limited thereto.

As shown in fig. 1 and 9 to 12, the rotating bracket 70 includes a rotating shaft 71, a front holder 72, a rear holder 72, a first limit baffle 73, and a second limit baffle 74. Front mount 72 and rear mount 73 are aligned in tandem along the fore-aft direction of fuel assembly detachment apparatus 100 of the present invention; the front end 71b of the rotating shaft 71 is assembled at the front support 72, the rear end 71c of the rotating shaft 71 is assembled at the rear support 73, and the front support 72 and the rear support 73 jointly provide a supporting function for the rotating shaft 71; the first limit baffle 73 and the second limit baffle 74 are respectively and detachably mounted on the front support 72 and the rear support 73, and of course, the first limit baffle 73 and the second limit baffle 74 are respectively and detachably mounted on the front support 72 or the rear support 73 according to actual needs, so as to facilitate the assembly and disassembly operations of the first limit baffle 73 and the second limit baffle 74; the intermediate table 20 is fixedly connected with the rotating shaft 71, preferably, the intermediate table 20 is fixedly connected with the rotating shaft 71 in the welding direction, and of course, the intermediate table can also be fixedly connected with the rotating shaft 71 in a fastening manner, so the invention is not limited thereto; the intermediate table 20 abuts against the first limit baffle 73 when being turned from the lying position to the standing position in the counterclockwise direction, as shown in fig. 11, and the intermediate table 20 abuts against the second limit baffle 74 when being turned from the lying position to the standing position in the clockwise direction, as shown in fig. 12; this ensures that the intermediate table 20 in the upright position remains stable. Specifically, the intermediate table 20 extends above the rotary shaft 71 in the left-right direction of the fuel assembly attaching and detaching device 100 of the present invention (see fig. 1), the section of the intermediate section 71a of the rotary shaft 71 is square, the sections of both the front end 71b and the rear end 71c of the rotary shaft 71 are circular, and the intermediate table 20 is fixedly connected to the intermediate section 71a of the rotary shaft 71, which increases the reliability of the assembly of the intermediate table 20 with the rotary shaft 71. More specifically, the middle section 71a of the rotary shaft 71 is provided with a first positioning hole 711 and a second positioning hole 712, the front support 72 and the rear support 73 are provided with a fitting hole 76, the first positioning hole 711 is aligned with the fitting hole 76 when the intermediate table 20 is turned counterclockwise from the lying position to the standing position, and as shown in fig. 11, the second positioning hole 712 is aligned with the fitting hole 76 when the intermediate table 20 is turned clockwise from the lying position to the standing position, so as to fix the intermediate table 20 in the standing position with the front support 72 and the rear support 73 by means of fixing pins, respectively, and improve the stability of the intermediate table 20 in the standing position. It is understood that the mating holes 76 can be formed by the front support 72 or the rear support 73 according to the actual requirement, and therefore, the above examples are not intended to be limiting. It should be noted that before the middle working platform 20 is turned from the lying position to the upright position counterclockwise and upward, the second limiting baffle 75 needs to be detached, and the first limiting baffle 74 limits the limit angle of the middle working platform 20 to be 90 degrees in the counterclockwise and upward direction; meanwhile, before the middle worktable 20 is turned clockwise and downwards from the lying position to the upright position, the first limit baffle 74 also needs to be detached, and the second limit baffle 75 limits the clockwise and downwards turning limit angle of the middle worktable 20 to 90 degrees.

As shown in fig. 1 and 2, the left table 10 includes a support frame 11, an adjustment screw 12, and a lock nut 13. The adjusting screw 12 penetrates through the bottom 111 of the supporting framework 11 along the up-down direction of the fuel assembly dismounting device 100 and is in threaded connection with the bottom 111, the locking nut 13 is positioned above the bottom 111 of the supporting framework 11, and the locking nut 13 is also sleeved on the adjusting screw 12 and is in threaded connection with the adjusting screw 12; therefore, the adjusting screw 12 and the locking nut 13 are matched for adjusting the height and the levelness of the left workbench 10, and the locking nut 13 locks the adjusted position to prevent accidental loosening.

As shown in fig. 6, 8, 9 and 13, the positioning mechanism 60a includes a gantry 61a, a front trapezoidal block 62a, a rear trapezoidal block 63a, a front connection block 64a, a rear connection block 65a, a first front screw 66a, a second front screw 67a, a first rear screw 68a and a second rear screw 69 a. The door-shaped bracket 61a is arranged along the front-back direction of the fuel assembly dismounting device 100 of the invention, the front connecting block 64a is assembled and connected with the front side bottom of the door-shaped bracket 61a through a first front screw 66a, and the rear connecting block 65a is assembled and connected with the rear side bottom of the door-shaped bracket 61a through a first rear screw 68 a; the front trapezoidal block 62a is positioned at the rear of the front side of the portal frame 61a, the front trapezoidal block 62a is also assembled and connected with the front connecting block 64a through a second front screw 67a, the rear trapezoidal block 63a is positioned at the front of the rear side of the portal frame 61a, the rear trapezoidal block 63a is also assembled and connected with the rear connecting block 65a through a second rear screw 69a, and the inclined surfaces 621(631) of the front trapezoidal block 62a and the rear trapezoidal block 63a face each other, the fixing mechanism 60b is installed at the top of the portal frame 61a, and preferably, the fixing mechanism 60b is installed at the top of the portal frame 61a in the direction of the fastener; therefore, the front trapezoidal block 62a, the rear trapezoidal block 63a, the first front screw 66a, the second front screw 67a, the first rear screw 68a and the second rear screw 69a are used for fixing and adjusting the position of the positioning mechanism 60a in the front-rear direction, and the specific steps are as follows: the first front screw 66a and the first rear screw 68a are simultaneously screwed, so that the positioning mechanism 60a on the middle workbench 20 can be locked on the middle workbench 20, and the positioning mechanism 60a on the right workbench 30 can be locked on the right workbench 30; the first front screw 66a is loosened, then the first rear screw 68a is tightened, and the position of the positioning mechanism 60a moves towards the first front screw 66 a; similarly, the first rear screw 68a is loosened and then the first front screw 66a is tightened, and the positioning mechanism 60a is moved in the direction of the first rear screw 68 a.

As shown in fig. 6, 8, 9 and 13, the fixing mechanism 60b includes a fixed clamp bracket 61b and a movable clamp bracket 62b which are in open-close fit with each other, and the fixed clamp bracket 61b and the movable clamp bracket 62b are respectively arranged along the front-rear direction of the fuel assembly disassembly and assembly apparatus 100 of the present invention; the fuel assembly 200 is clamped between the fixed clamp bracket 61b and the movable clamp bracket 62b of the middle workbench 20, and the support assembly 80a is clamped between the fixed clamp bracket 61b and the movable clamp bracket 62b of the right workbench 30; so as to facilitate clamping of the fuel assembly 200 and the support assembly 80a by the fixing mechanism 60b, respectively. Specifically, the fixing mechanism 60b further includes a cushion block 63b, a pressing block 64b and a pressing screw 65b, the cushion block 63b is mounted inside the fixed clamp bracket 61b, the pressing block 64b is located inside the movable clamp bracket 62b and loosely clamped with the cushion block 63b, the pressing screw 65b is rotatably inserted into the movable clamp bracket 62b, the pressing screw 65b is further assembled and connected with the pressing block 64b, and the distance between the pressing block 64b and the cushion block 63b is adjusted through rotation of the pressing screw 65b, so that clamping reliability of the fixing mechanism 60b on the fuel assembly 200 or the support assembly 80a is ensured. More specifically, the movable clamp bracket 62b includes a cross beam 62b1 and a vertical beam 62b2, a first end of the cross beam 62b1 is hinged to a first end of the fixed clamp bracket 61b, a first end of the vertical beam 62b2 is hinged to a second end of the fixed clamp bracket 61b, second ends of the cross beam 62b1 and the vertical beam 62b2 are detachably assembled, compression screws 65b are rotatably inserted on the cross beam 62b1 and the vertical beam 62b2 respectively, and the compression screws 65b of the cross beam 62b1 and the vertical beam 62b2 are respectively provided with a pressing block 64b so as to facilitate the opening or closing operation of the positioning mechanism 60 b. In order to improve the convenience of detachably assembling and connecting the second ends of the cross beam 62b1 and the vertical beam 62b2, the second ends of the cross beam 62b1 and the vertical beam 62b2 are assembled and connected through the disassembling and assembling screw 62b3, but not limited thereto. It should be noted that the fixing mechanism 60b shown in fig. 6 and 9 is suitable for 17 × 17 fuel assembly 200 clamping, while in fig. 7, the pressing screw 65b in the fixing mechanism 60b is replaced by a long screw to be suitable for 5 × 5 fuel assembly 200 clamping.

As shown in fig. 9, the intermediate table 20 includes a support plate 21, a support frame 22, a backing plate 23, an adjusting screw 24, and a lock nut 25. The support plate 21 is provided with an inverted trapezoidal structure 211 clamped between the front trapezoidal block 62a and the rear trapezoidal block 63a, the upper end of the support frame 22 is assembled and connected with the support plate 21, the lower end of the support frame 22 is assembled and connected with the backing plate 23, and preferably, the lower end of the support frame 22 is assembled and connected with the backing plate 23 in a welding mode; the adjusting screw 24 penetrates through the backing plate 23 along the up-down direction of the fuel assembly dismounting device 100 and is in threaded connection with the backing plate 23, the locking nut 25 is positioned above the backing plate 23, the locking nut 25 is also sleeved on the adjusting screw 24 and is in threaded connection with the adjusting screw 24 so as to adjust the levelness of the middle worktable 20, and the locking nut 25 locks the adjusted position to prevent loosening. Specifically, the support plate 21 includes an upper support plate 21a and a lower support plate 21b stacked on each other, the upper support plate 21a and the lower support plate 21b are assembled and connected by a fastener 21c, and the inverted trapezoid 211 is formed on the upper support plate 21a, and preferably, the cross section of the upper support plate 21a is a profiled section having an upper inverted trapezoid shape and a lower rectangular shape so as to be engaged with the front trapezoid block 62a and the rear trapezoid block 63a by the inverted trapezoid 211, respectively, thereby reliably adjusting the position of the positioning mechanism 60a in the front-rear direction, but is not limited thereto.

As shown in fig. 13, the right table 30 includes a support plate 31, a support frame 32, a backing plate 33, an adjusting screw 34, and a lock nut 35. The support plate 31 is provided with an inverted trapezoidal structure 311 clamped between the front trapezoidal block 62a and the rear trapezoidal block 63a, the upper end of the support frame 32 is assembled and connected with the support plate 31, the lower end of the support frame 32 is assembled and connected with the backing plate 33, and preferably, the lower end of the support frame 32 is assembled and connected with the backing plate 23 in a welding mode; the adjusting screw 34 penetrates through the backing plate 33 along the up-down direction of the fuel assembly dismounting device 100 and is in threaded connection with the backing plate 33, the locking nut 35 is located above the backing plate 33, the locking nut 35 is further sleeved on the adjusting screw 34 and is in threaded connection with the adjusting screw 34 so as to adjust the height and the levelness of the right workbench 30, and the locking nut 35 locks the adjusted position to prevent looseness. Specifically, the support plate 31 includes an upper support plate 31a and a lower support plate 31b stacked on each other, the upper support plate 31a and the lower support plate 31b are assembled and connected by a fastener 31c, an inverted trapezoidal structure 311 is formed on the upper support plate 31a, and the cross section of the upper support plate 31a is a profiled section having an upper inverted trapezoid shape and a lower rectangular shape so as to be engaged with the front trapezoid block 62a and the rear trapezoid block 63a by the inverted trapezoidal structure 311, respectively, thereby reliably adjusting the positioning mechanism 60a in the front-rear direction position, but is not limited thereto.

It should be noted that, when the fuel assembly disassembly and assembly device 100 of the present invention is installed on site, the left workbench 10, the middle workbench 20 and the right workbench 30 are linearly arranged on a steel platform with a floor height of 5 m in a spaced manner, the left workbench 10 and the right workbench 30 are placed on a supporting steel plate of the steel platform, the rotating bracket 70 is installed on two parallel beams of the steel platform, the portion of the steel platform corresponding to the lower portion of the middle workbench 20 is hollowed out, so that no interference is generated when the middle workbench 20 is turned clockwise or counterclockwise; the intermediate table 20 is supported by channel beams crossing the two beams when being turned to a lying position (also called a horizontal position), and the channel beams are detachably assembled and connected with the beams.

The working principle of the fuel assembly dismounting device of the invention is explained with the attached drawings:

the process of loading the fuel assembly 200 is as follows:

mounting the supporting seat 40 at the left end of the middle workbench 20 through a screw, removing the second limiting baffle 75, and then removing a channel steel which is arranged at the left side of the rotating bracket 70 and used for supporting the middle workbench 20; the intermediate worktable 20 is rotated counterclockwise to the limit position of the first limit baffle 74, i.e. rotated 90 degrees counterclockwise; two fixing pins are installed between the middle worktable 20 and the front supporting seat 72 and between the middle worktable 20 and the rear supporting seat 73; the dismounting screws 62b3 of the eight fixing mechanisms 60b mounted on the intermediate table 20 are dismounted, and the cross beam 62b1 and the vertical beam 62b2 are opened to the state shown in fig. 8. Vertically hoisting the fuel assembly 200 to the position of the fixing mechanism 60b, and enabling the lower pipe seat of the fuel assembly 200 to be located on the supporting surface 41a of the supporting seat 40, wherein two sides of the lattice 220 of the fuel assembly 200 are respectively attached to the cushion block 63b of each fixing mechanism 60b on the middle workbench 20; the position of each fixing mechanism 60b in the left-right direction (also referred to as the longitudinal direction) of the intermediate table 20 is adjusted by adjusting the position of each positioning mechanism 60a on the intermediate table 20 so as to correspond to the eight frames 220 of the fuel assembly 200, respectively; closing the cross beam 62b1 and the vertical beam 62b2 of each fixing mechanism 60b on the intermediate table 20 to the state shown in fig. 6, and tightening the dismounting screw 62b 3; the fuel assembly 200 is fixed to the intermediate table 20 by the compression screws 65b of the two leftmost and rightmost fixing mechanisms 60b on the intermediate table 20. Two fixing pins between the middle worktable 20 and the front supporting seat 72 and between the middle worktable 20 and the rear supporting seat 73 are removed, the middle worktable 20 is slowly rotated clockwise to be horizontal (i.e. a lying position) by means of a hoisting tool, and a channel steel for supporting the middle worktable 20 at the left side of the upper rotating bracket 70 is reinstalled. Finally, the bearing block 40 is removed and a second limit stop 75 is installed.

(II) the procedure for removing the fuel rods 210 from the fuel assembly 200 is as follows:

first, the level of the intermediate table 20 and the coaxiality of the eight fixing mechanisms 60b on the intermediate table 20 are adjusted. The adjusting screw 24 of the intermediate table 20 is adjusted to level the intermediate table 20, and after leveling, the lock nut 25 is tightened to fix the position of the intermediate table 20. The coaxiality of the eight fixing mechanisms 60b on the intermediate workbench 20 needs to be adjusted by a centering instrument by taking the eight fixing mechanisms 60b on the intermediate workbench 20 as a reference; since the intermediate table 20 is adjusted in the horizontal degree and the support plate 21 on the intermediate table 20 is better in the flatness by default, the adjustment of the coaxiality of the remaining eight fixing mechanisms 60b on the intermediate table 20 except for the leftmost and rightmost positions in the width direction (i.e., the front-rear direction) of the intermediate table 20 is mainly performed. The tightness of the first front screw 66a between the door-shaped bracket 61a and the front connecting block 64a and the tightness of the first rear screw 68a between the door-shaped bracket 61a and the rear connecting block 65a are respectively adjusted, so that the remaining ones of the eight fixing mechanisms 60b on the intermediate table 20 except for the leftmost one and the rightmost one meet the requirements on the front-rear direction position of the intermediate table 20. After the adjustment is completed, the compression screws 65b of the remaining ones of the eight fixing mechanisms 60b on the intermediate table 20 except for the leftmost and rightmost ones are tightened, and the fixing of the grids 220 of the fuel assembly 200 by the remaining ones of the eight fixing mechanisms 60b on the intermediate table 20 except for the leftmost and rightmost ones is completed.

Next is mounting the support assembly 80a and adjusting the coaxiality of each of the (five total) fixing mechanisms 60b on the right table 30. Each fixing mechanism 60b on the right workbench 30 is uniformly distributed on the right workbench 30, five supporting components 80a are respectively arranged in each fixing mechanism 60b corresponding to the right workbench 30, and the supporting components 80a are fixed by the compression screws 65 b. Since the height and the levelness of the right table 30 are adjusted at the time of initial installation, the alignment of the coaxiality of all the fixing mechanisms 60b can be completed by adjusting the positions of the fixing mechanisms 60b on the remaining middle table 20 and each of the fixing mechanisms 60b on the right table 30 in the front-rear direction with reference to the leftmost and rightmost fixing mechanisms 60b on the middle table 20 by the centering device.

The upper stem of fuel assembly 200 is then removed, providing fuel assembly 200 with the conditions for removing fuel rods 210.

Further, the mounting jig 90 and the traction wire 80b are installed. A first end of a sufficiently long pulling wire 80b is fixed to the reel 52 of the right pulling means 50b, and a second end of the pulling wire 80b passes through the guide passage 54a of the stopper 54 and is assembled with the jig 90 through the pressing sleeve 95. The position of the disassembled fuel rod 210 and the positions of the corresponding holes on the support assemblies 80a are confirmed, and then the jig 90 is sequentially passed through each support assembly 80a (i.e., five support assemblies) on the right table 30 from right to left, and the jig 90 is stuck at the end plugs of the fuel rods 210.

Finally, the position of the wire winding motor 51 of the right traction mechanism 50b is adjusted and the fuel rod 210 is disassembled. The upper and

lower studs

535 and 534 of the right drawing mechanism 50b are rotated, respectively, to adjust the positions of the winding motor 51 and the winder 52 in the up-down and horizontal directions, so that the drawing wire 80b coincides with the center line of the corresponding hole of each support assembly 80 a. The deviation of the traction wire 80b wound on the cord reel 52 due to the restriction of the guide passage 54a of the stopper 54 has little influence on the traction direction thereof. Operating the winding motor 51 of the right traction mechanism 50b so that the traction wire 80b pulls the fuel rod 210 to move under the winding of the cord reel 52, and adjusting the rotation speed of the winding motor 51 of the right traction mechanism 50b can adjust the speed of detaching the fuel rod 210 from the fuel assembly 200; the reducing structure 91 of the clamp 90 has good guiding function for the clamp to penetrate through the supporting component 80a, and the phenomenon that the pull rod stops due to collision and interference of the clamp 90 and the supporting component 80a can be avoided. When the fuel rod 210 is separated from the fuel assembly 200 and reaches a designated position, the operation of the winding motor 51 of the right traction mechanism 50b is stopped, the clamp 90 is separated from the end plug of the fuel rod 210, that is, the disassembly of one fuel rod 210 is completed, then the positions of the traction wire 80b and the winding motor 51 of the right traction mechanism 50b are adjusted, and the disassembly work of the remaining fuel rods 210 can be repeatedly performed.

(III) assembling the fuel rod to the fuel assembly as follows:

first, the fuel rods 210 are installed. The fuel rods 210 to be assembled are respectively installed in the corresponding positions of the five support assemblies 80a on the right table 30 in such a manner that the upper end plugs are left and the lower end plugs are right.

Next is a grid 220 for mounting fuel assemblies 200. Mounting the support base 40 to the right end of the intermediate table 20 for determining the position of the fuel assembly 200 in the lengthwise direction (i.e., the left-right direction) of the intermediate table 20; then, the grids 220 of the fuel assembly 200 with the stem mounted thereon are fitted into the eight fixing mechanisms 60b of the intermediate table 20, with the fuel assembly 200 with the stem end facing left and right and the bottom end face of the stem abutting against the support surface 41a of the support base 40. The position of each of the fixing mechanisms 60b in the longitudinal direction (i.e., the left-right direction) of the intermediate table 20 is adjusted by adjusting the position of each of the positioning mechanisms 60a on the intermediate table 20 so as to correspond to the eight frames 220 of the fuel assembly 200, respectively. With the centering apparatus, the positions of the fixing mechanisms 60b of the intermediate table 20 except for the leftmost and rightmost fixing mechanisms 60b in the width direction (i.e., the front-rear direction) of the intermediate table 20 are adjusted with reference to all the fixing mechanisms 60b on the intermediate table 20. After the adjustment is completed, the compression screws 65b of each of the fixing mechanisms 60b of the intermediate work table 20 are fastened, respectively, to fix the grids 220 of the fuel assemblies 200 to the intermediate work table 20. The backup bearing 40 and, if installed, the lower and upper headers of the grid 220 of the fuel assembly 200 are then removed.

The pull wire 80b and clamp 90 are then installed. A first end of a sufficiently long pulling wire 80b is fixed to the cord reel 52 of the left pulling means 50a, and a second end of the pulling wire 80b passes through the guide passage 54a of the stopper 54 and is assembled with the jig 90 through the pressing sleeve 95. The position of the installed fuel rods 210 and the corresponding positions on the grids 220 of the fuel assembly 200 are confirmed, and then the jig 90 is sequentially passed through each grid 220 of the fuel assembly 200 from left to right, and the jig 90 is fixed to the end plugs of the fuel rods 210 on the support assembly 80 a. The winding motor 51 of the left traction mechanism 50a is operated, the traction wire 80b pulls the fuel rod 210 to move under the winding of the winder 52, and the movement speed of the fuel rod 210 can be adjusted by adjusting the rotating speed of the winding motor 51 of the left traction mechanism 50 a; the reducing structures 91 of the clamps 90 have good guiding effect on the reducing structures penetrating through the grids 220 of the fuel assemblies 200, and the phenomenon that the pull rod stops due to collision and interference of the clamps 90 and the grids 220 of the fuel assemblies 200 can be avoided. When the fuel rod 210 is mounted to reach a specified position, the operation of the winding motor 51 of the left traction mechanism 50a is stopped, the clamp 90 is separated from the end plug of the fuel rod 210, that is, the mounting of one fuel rod 210 is completed, and then the positions of the traction wire 80b and the winding motor 51 of the left traction mechanism 50a are adjusted to repeatedly perform the mounting work of the rest fuel rods 210.

And (IV) hoisting the fuel assembly as follows:

after all the fuel rods 210 are installed in the fuel assembly 200, the upper and lower nozzle of the fuel assembly 200 are installed. Mounting the supporting seat 40 at the right end of the middle workbench 20, removing the first limit baffle 74, and then removing a channel steel which is arranged at the right side of the rotating bracket 70 and used for supporting the middle workbench 20; the middle worktable 20 is rotated clockwise to the limit position of the second limit baffle 75, namely rotated 90 degrees clockwise, and two fixing pins between the middle worktable 20 and the front support 72 and between the middle worktable 20 and the rear support 73 are installed; the fuel assembly 200 is attached to the lifting apparatus by a dedicated hanger, the dismounting screws 62b3 of each fixing mechanism 60b on the intermediate table 20 are dismounted, and the cross beam 62b1 and the vertical beam 62b2 are opened to the state shown in fig. 8. At this point, the fuel assembly 200 can be lifted vertically off the apparatus using the lifting device. Then adjusting the cross beam 62b1 and the vertical beam 62b2 of each fixing mechanism 60b on the middle workbench 20 to the state shown in fig. 6, and tightening the dismounting screw 62b 3; two fixing pins between the middle workbench 20 and the front support 72 and between the middle workbench 20 and the rear support 73 are removed, the middle workbench 20 is slowly rotated to be horizontal in the counterclockwise direction by means of the hoisting equipment, and channel steel for supporting the middle workbench 20 on the right side of the rotating support 70 is installed.

Compared with the prior art, by means of the cooperation of the middle workbench 20, the rotating bracket 70 and the supporting seat 40, and the supporting seat 40 is positioned right below the clamping mechanism 60 on the middle workbench 20 when the middle workbench 20 is turned to the vertical position, at the moment, the supporting seat 40 supports the tube seat in the fuel assembly 200 which is vertically hoisted, and meanwhile, the fixing mechanism 60b on the middle workbench 20 clamps and fixes the fuel assembly 200 so as to meet the requirement that the high-precision fuel assembly 200 is hoisted in or out; meanwhile, because the fixing mechanism 60b of the clamping mechanism 60 on the middle worktable 20 is used for clamping the fuel assembly 200, the positioning mechanism 60a of the clamping mechanism 60 on the middle worktable 20 is arranged in a position-adjustable manner, the fixing mechanism 60b of the clamping mechanism 60 on the left worktable 10 or the right worktable 30 is used for clamping the support assembly 80a, and the positioning mechanism 60a of the clamping mechanism 60 on the left worktable 10 or the right worktable 30 is also arranged in a position-adjustable manner, the fuel assembly 200 and the support assembly 80a are accurately aligned with each other when the middle worktable 20 is in a flat lying position, and then the fuel rods 210 are assembled and disassembled with high precision between the grid 220 of the fuel assembly 200 and the support assembly 80a under the matching of the left traction mechanism 50a on the left worktable 10 and the right traction mechanism 50b on the right worktable 30, so as to meet the high precision requirement of the disassembly and assembly of the fuel assembly 200. In addition, the fuel assembly disassembly and assembly device 100 of the present invention can also be used for maintenance of the fuel assembly 200, for replacement of a stem in the fuel assembly 200, and to meet the directional requirements for the extraction or insertion of the fuel rod 210.

It should be noted that, in the drawings, the direction indicated by the arrow a is the direction from left to right of the fuel assembly disassembly and assembly apparatus 100 of the present invention, the direction indicated by the arrow B is the direction from front to back of the fuel assembly disassembly and assembly apparatus 100 of the present invention, and the direction indicated by the arrow C is the direction from top to bottom of the fuel assembly disassembly and assembly apparatus 100 of the present invention; in addition, the left table 10, the middle table 20 and the right table 30 are each a platform; in addition, the support assembly 80a is structurally identical to the lattice 220.

The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, therefore, the present invention is not limited by the appended claims.

Claims

1. A fuel assembly dismounting device comprises a left workbench, a middle workbench, a right workbench, a supporting seat, a left traction mechanism, a right traction mechanism, a clamping mechanism, a rotary support for bearing the middle workbench and a support assembly for inserting and fixing fuel rods, wherein the left workbench, the middle workbench and the right workbench are arranged in a straight line in sequence at intervals along the left and right directions of the fuel assembly dismounting device, the middle workbench is pivoted with the rotary support around a horizontal pivoting line, the middle workbench has a lying position and a vertical position relative to the rotary support in the process of vertically overturning around the horizontal pivoting line, the left traction mechanism is installed on the left workbench, the right traction mechanism is installed on the right workbench, one of the left workbench and the right workbench and the middle workbench are respectively provided with the clamping mechanism, the clamping mechanism comprises a position-adjustable positioning mechanism and a fixing mechanism arranged on the positioning mechanism, the fixing mechanism on the middle workbench is used for clamping a fuel assembly, the fixing mechanism on the left workbench or the right workbench is used for clamping the supporting assembly, the supporting seat is detachably arranged on the middle workbench, the supporting seat is also arranged beside the clamping mechanism on the middle workbench, the supporting seat is arranged under the clamping mechanism on the middle workbench when the middle workbench is overturned to the vertical position, and the left traction mechanism and the right traction mechanism are matched with each other to realize the disassembly and assembly of fuel rods between a grid of the fuel assembly and the supporting assembly.

2. The fuel assembly disassembly and assembly apparatus of claim 1, wherein the right traction mechanism pulls out and inserts the fuel rods in the lattice of fuel assemblies at the middle table into the support assemblies at the right table, and the left traction mechanism pulls out and inserts the fuel rods in the support assemblies at the right table into the lattice of fuel assemblies at the middle table; or the left traction mechanism pulls out and inserts the fuel rods in the grids of the fuel assemblies at the middle working table into the support assemblies at the left working table, and the right traction mechanism pulls out and inserts the fuel rods in the support assemblies at the left working table into the grids of the fuel assemblies at the middle working table.

3. The fuel assembly de-installation apparatus according to claim 1, wherein the support base is selectively installed at a left end or a right end of the intermediate table.

4. The fuel assembly and disassembly apparatus of claim 3, wherein the intermediate table, when flipped counterclockwise up from the flat position to the upright position, positions the bearing mount mounted to the left end of the intermediate table directly below the fixture at the intermediate table, and the intermediate table, when flipped clockwise down from the flat position to the upright position, positions the bearing mount mounted to the right end of the intermediate table directly below the fixture at the intermediate table.

5. The fuel assembly disassembly and assembly device of claim 1, wherein the supporting seat comprises a folded plate and reinforcing rib plates distributed on the front side and the rear side of the folded plate, the reinforcing rib plates are provided with lateral mounting holes which are penetrated in the front and the rear direction, and the folded plate is provided with bottom mounting holes which are penetrated in the up and down direction.

6. The fuel assembly disassembly and assembly apparatus of claim 5, wherein the flap projects in an "L" shape in a front-to-back direction of the fuel assembly disassembly and assembly apparatus.

7. The fuel assembly disassembling and assembling device according to claim 1, further comprising a pull wire and a clamp for clamping the fuel rod, wherein a first end of the pull wire is in assembly connection with the clamp, and a second end of the pull wire is selectively in detachable assembly connection with the left traction mechanism or the right traction mechanism.

8. The fuel assembly disassembly and assembly device of claim 7, wherein the head end of the clamp has a diameter-changing structure which is arranged to increase from the head end to the tail end of the clamp, the tail end of the clamp has a plurality of encircling arms which are spaced from each other and arranged in a circle in the circumferential direction, all the encircling arms together enclose an encircling cavity, and the first end of the pull wire is connected with the diameter-changing structure in an assembly manner.

9. The fuel assembly de-assembly apparatus of claim 8, wherein the clamp has a cross-sectional outer profile that is circular, regular polygonal, or elliptical.

10. The fuel assembly de-assembly apparatus of claim 8, wherein the tail end of the clamp is divided equally in a circumferential direction to form the clasping arms.

11. The fuel assembly disassembly and assembly device of claim 8, wherein the diameter-variable structure is provided with a through hole penetrating through a side wall of the diameter-variable structure, and the first end of the pull wire penetrates through the through hole and is fixed with a part corresponding to the pull wire.

12. The fuel assembly and disassembly apparatus of claim 7, wherein the left and right drawing mechanisms are each disposed in a position adjustable manner, and each of the left and right drawing mechanisms comprises a winding motor, a reel installed on an output end of the winding motor, and a position adjusting assembly for adjusting a position of the winding motor, the winding motor is installed on the position adjusting assembly, the output end of the winding motor is disposed along a front-rear direction of the fuel assembly and disassembly apparatus, and a second end of the drawing wire is wound on the reel.

13. The fuel assembly de-assembly apparatus of claim 12, wherein the left and right traction mechanisms each further comprise a stopper mounted directly or indirectly to the winding motor, the stopper having a guide channel aligned with the winder, the pull wire passing through the guide channel.

14. The fuel assembly and disassembly apparatus of claim 13, wherein the guide channel is a through hole, and the head end and/or the tail end of the through hole are/is provided with a chamfer structure.

15. The fuel assembly and disassembly apparatus of claim 12, wherein the position adjustment assembly comprises an upper support, a lower support, a horizontal support, a support plate, a horizontal stud, an upper stud, a lower stud, a horizontal guide rail, and an upper guide rail and a lower guide rail, wherein the upper guide rail and the lower guide rail are mounted on the upper support and the lower support, the horizontal support is slidably mounted on the upper guide rail and the lower guide rail, the upper stud and the lower stud are rotatably mounted on the upper support and the lower support and located beside the upper guide rail, the upper stud and the lower stud are further threaded into the horizontal support, the horizontal guide rail is arranged along the front-rear direction of the fuel assembly and disassembly apparatus and mounted on the horizontal support, the support plate is slidably mounted on the horizontal guide rail, the horizontal stud is arranged along the front-rear direction of the fuel assembly and disassembly apparatus, the horizontal stud is rotatably mounted, the horizontal stud is further arranged in the supporting plate in a threaded transmission mode, and the winding motor is installed on the supporting plate.

16. The fuel assembly de-assembly apparatus of claim 1, wherein the rotating bracket comprises a rotating shaft, a front support, a rear support, a first limit baffle, and a second limit baffle, the front support and the rear support are arranged in alignment in tandem along the front-rear direction of the fuel assembly disassembly and assembly equipment, the front end of the rotating shaft is assembled at the front support, the rear end of the rotating shaft is assembled at the rear support, the first limit baffle and the second limit baffle are respectively detachably arranged on the front support and/or the rear support, the middle working table is fixedly connected with the rotating shaft, the middle working table is abutted against the first limiting baffle plate when being overturned from the lying position to the upright position in the anticlockwise direction, the middle working table is abutted against the second limiting baffle plate when being overturned from the lying position to the standing position in the clockwise direction.

17. The fuel assembly detachment apparatus according to claim 16, wherein the intermediate table spans above the rotation shaft in a left-right direction of the fuel assembly detachment apparatus.

18. The fuel assembly and disassembly apparatus of claim 16, wherein the rotation shaft has a square cross-section at a middle section thereof, and has a circular cross-section at both front and rear ends thereof, and the intermediate table is fixedly coupled to the middle section of the rotation shaft.

19. The fuel assembly and disassembly apparatus of claim 18, wherein the middle section of the rotating shaft defines a first positioning hole and a second positioning hole, the front support and/or the rear support defines a mating hole, the first positioning hole is aligned with the mating hole when the intermediate table is flipped counterclockwise from the flat position to the upright position, and the second positioning hole is aligned with the mating hole when the intermediate table is flipped clockwise from the flat position to the upright position.

20. The fuel assembly disassembly and assembly device of claim 1, wherein the left workbench comprises a supporting framework, an adjusting screw and a locking nut, the adjusting screw penetrates through the bottom of the supporting framework along the vertical direction of the fuel assembly disassembly and assembly device and is in threaded connection with the bottom, the locking nut is positioned above the bottom of the supporting framework, and the locking nut is further sleeved on the adjusting screw and is in threaded connection with the adjusting screw.

21. The fuel assembly disassembly and assembly device of claim 1, wherein the positioning mechanism comprises a gantry, a front trapezoid, a rear trapezoid, a front connection block, a rear connection block, a first front screw, a second front screw, a first rear screw, and a second rear screw, the gantry is arranged along the front-rear direction of the fuel assembly disassembly and assembly device, the front connection block is assembled and connected with the front bottom of the gantry through the first front screw, the rear connection block is assembled and connected with the rear bottom of the gantry through the first rear screw, the front trapezoid is positioned behind the front side of the gantry, the front trapezoid is also assembled and connected with the front connection block through the second front screw, the rear trapezoid is positioned in front of the rear side of the gantry, the rear trapezoid is also assembled and connected with the rear connection block through the second rear screw, and the inclined surfaces of both the front and rear trapezoidal blocks face each other, and the fixing mechanism is installed at the top of the portal bracket.

22. The fuel assembly disassembly and assembly device of claim 21, wherein the intermediate working table comprises a support plate, a support frame, a base plate, an adjusting screw and a locking nut, the support plate has an inverted trapezoidal structure clamped between the front trapezoidal block and the rear trapezoidal block, the upper end of the support frame is assembled and connected with the support plate, the lower end of the support frame is assembled and connected with the base plate, the adjusting screw penetrates through the base plate along the vertical direction of the fuel assembly disassembly and assembly device and is in threaded connection with the base plate, the locking nut is located above the base plate, and the locking nut is further sleeved on the adjusting screw and is in threaded connection with the adjusting screw.

23. The fuel assembly de-assembly apparatus of claim 22 wherein the support plate comprises an upper support plate and a lower support plate stacked on top of each other, the upper support plate and the lower support plate being assembled and connected by fasteners, the inverted trapezoidal configuration being formed on the upper support plate.

24. The fuel assembly and disassembly apparatus of claim 23, wherein the cross-section of the upper support plate is a profiled section having an inverted upper trapezoidal shape and a rectangular lower rectangular shape.

25. The fuel assembly disassembly and assembly device of claim 21, wherein the right workbench comprises a support plate, a support frame, a base plate, an adjusting screw and a locking nut, the support plate has an inverted trapezoidal structure clamped between the front trapezoidal block and the rear trapezoidal block, the upper end of the support frame is in assembly connection with the support plate, the lower end of the support frame is in assembly connection with the base plate, the adjusting screw penetrates through the base plate along the vertical direction of the fuel assembly disassembly and assembly device and is in threaded connection with the base plate, the locking nut is located above the base plate, and the locking nut is further sleeved on the adjusting screw and is in threaded connection with the adjusting screw.

26. The fuel assembly and disassembly apparatus of claim 25, wherein the support plate comprises an upper support plate and a lower support plate stacked on each other, the upper support plate and the lower support plate are assembled and connected by a fastener, the inverted trapezoidal structure is formed on the upper support plate, and the cross section of the upper support plate is a profiled cross section with an upper inverted trapezoid shape and a lower rectangular shape.

27. The fuel assembly disassembly and assembly device of claim 1, wherein the fixing mechanism comprises a fixed clamp support and a movable clamp support which are in open-close fit with each other, the fixed clamp support and the movable clamp support are respectively arranged along the front-back direction of the fuel assembly disassembly and assembly device, the fuel assembly is clamped between the fixed clamp support and the movable clamp support of the middle workbench, and the supporting assembly is clamped between the fixed clamp support and the movable clamp support of the left workbench or the right workbench.

28. The fuel assembly disassembly and assembly device of claim 27, wherein the fixing mechanism further comprises a cushion block, a pressing block and a pressing screw, the cushion block is installed inside the fixed clamp bracket, the pressing block is located inside the movable clamp bracket and loosely clamped with the cushion block, the pressing screw is rotatably inserted into the movable clamp bracket, the pressing screw is further assembled with the pressing block, and the distance between the pressing block and the cushion block is adjusted by the rotation of the pressing screw.

29. The fuel assembly disassembly and assembly device of claim 28, wherein the movable clamp support comprises a cross beam and a vertical beam, a first end of the cross beam is hinged to a first end of the fixed clamp support, a first end of the vertical beam is hinged to a second end of the fixed clamp support, second ends of the cross beam and the vertical beam are detachably assembled and connected, the compression screws respectively penetrate through the cross beam and the vertical beam in a rotatable manner, and the compression screws of the cross beam and the vertical beam are respectively provided with the pressing block.