A correction device for nuclear power new fuel assembly

Abstract

The present application relates to nuclear power assembly technical field, specifically to a kind of correction device for nuclear power new fuel assembly, including side base, for being inserted from fuel assembly at any time to correct cross grid, the centering correction mechanism for correcting centricity and perpendicularity, the centering drive mechanism for realizing centricity correction by clamping, passive lifting column is lifted to increase correction range while correcting, lifting switch piece controls lifting direction so that lifting direction is irrelevant with correction direction, and the device of the present application can flexibly correct at any position of fuel assembly by the cooperation of cross grid and centering correction mechanism, without waiting for specific opportunity or complex preliminary preparation, improve the flexibility of correction operation, correction range can be flexibly expanded, cover every part of fuel assembly needing correction, without frequent disassembly and reinstallation correction device, improve correction efficiency and comprehensiveness.

Description

A calibration device for a new nuclear power fuel assembly Technical Field

[0001] This invention relates to the field of nuclear power assembly technology, specifically to a calibration device for a new nuclear power fuel assembly. Background Technology

[0002] Nuclear power assembly technology is a core research and development direction in the field of nuclear power generation, covering key components such as fuel assemblies, control rod assemblies, support structure assemblies, and instrumentation assemblies. The design of high-efficiency fuel assemblies is constantly being optimized to improve the utilization rate of uranium resources; the development of accident-resistant fuels enhances safety under extreme operating conditions; and the manufacturing process integrates precision welding and special material forming technologies to ensure the reliability and long life of the assemblies. With the rise of intelligent assembly technology, remote monitoring and fault diagnosis systems further improve the stability and economy of nuclear power plant operation.

[0003] During installation and use, fuel rods need to be neutralized to ensure their accurate alignment. Due to the dense arrangement of fuel rods and the need for underwater operation, positioning the fuel rods is difficult.

[0004] Existing nuclear power plant fuel assemblies are arranged in an array. To ensure alignment and position accuracy, the correction device needs to be fitted onto the fuel rod and positioned. This correction method usually requires the correction operation to be carried out before the fuel assembly stage. It is necessary to ensure that there is an uncovered section of the fuel rod and to fit the correction device from that end. After the correction is completed, the correction device needs to be removed from it along the same path. Thus, during use, there are requirements for the timing of correction, making it difficult to perform correction in real time.

[0005] In view of this, we propose a correction device for new nuclear power fuel assemblies. Summary of the Invention

[0006] The purpose of this invention is to provide a calibration device for new nuclear power fuel assemblies, thereby solving the problems existing in the current fuel assembly calibration devices described in the background section. To achieve the above objective, this invention provides the following technical solution: A calibration device for new nuclear power fuel assemblies, comprising a side base, a lifting platform slidably connected to the outer surface of the side base, side housings fixedly connected to both sides of the lifting platform, a cross grid provided on the inner surface of the side housings, a centering correction mechanism provided on the outer surface of the cross grids, a centering drive mechanism provided on the inner surface of the lifting platform, a passive lifting column provided on the inner surface of the lifting platform, and a lifting switching component provided on the outer surface of the passive lifting column.

[0007] Preferably, a movable outer shell is slidably connected to the inner surface of the side outer shell, and a fuel pack model is slidably connected to the inner surface of the cross grid.

[0008] Preferably, the cross grid includes a grid base, which is slidably connected to the outer surface of the movable housing. The outer surface of the grid base is provided with a driven actuation groove. The inner surface of the grid base is slidably connected with a displacement limiting post. The outer surface of the displacement limiting post is fixedly connected with a return spring. The outer surface of the grid base is fixedly connected with equidistantly distributed grid inserts. The inner surface of the side housing is fixedly connected with a drive cylinder.

[0009] Preferably, there are two grid bases in each movable housing, and the grid bases on both sides are stacked on top of each other and perpendicularly intersecting. The driven actuation slots are evenly distributed. There are four return springs, which are symmetrically distributed on both sides of the displacement limiting post. The two ends of the return springs are fixedly connected to the inner surface of the displacement limiting post and the inner surface of the grid base, respectively. The output end of the drive cylinder is fixedly connected to the outer surface of the movable housing.

[0010] Preferably, the centering and correction mechanism includes a fixed bracket, which is fixedly connected to the inner surface of the movable housing. A rotating crank is rotatably connected to the outer surface of the fixed bracket. Symmetrically distributed misaligned connecting columns are fixedly connected to the outer surface of the rotating crank. A linkage push rod is rotatably connected to the outer surface of the rotating crank. A height matching groove is formed on the outer surface of the linkage push rod. An active push block is slidably connected to the outer surface of the linkage push rod. A height matching block is fixedly connected to the outer surface of the active push block.

[0011] Preferably, the fixed bracket is fixedly connected to the displacement limiting column, the rotating cranks are evenly distributed, the misaligned connecting column is slidably connected to the inner surface of the driven actuating groove, the active push block is slidably connected to the inner surface of the side shell, and the height matching block is slidably connected to the inner surface of the height matching groove.

[0012] Preferably, the centering drive mechanism includes a servo motor, which is fixedly connected to the inner surface of the lifting platform. A transmission belt is fitted onto the output end of the servo motor, and an input worm gear is fitted onto the other end of the transmission belt. An output worm wheel meshes with the outer surface of the input worm gear, and an active cam is fixedly connected to both ends of the output worm wheel.

[0013] Preferably, there are two transmission belts and two input worm gears, which are symmetrically distributed on both sides of the servo motor. The input worm gears are rotatably connected to the inner surface of the lifting platform, and the output worm gear and the active cam are both rotatably connected to the inner surface of the lifting platform. The active cam is in contact with the outer surface of the active push block.

[0014] Preferably, the passive lifting column includes an inner rotating disk, which is fixedly connected to the output end of a servo motor. An inner actuating column is fixedly connected to the outer surface of the inner rotating disk. A driven lever is rotatably connected to the inner surface of the lifting platform. An inner actuating groove is formed on the outer surface of the driven lever. An extension lever is fixedly connected to one end of the driven lever. A push pawl is rotatably connected to the outer surface of the extension lever. A driven ratchet is rotatably connected to the inner surface of the lifting platform. A meshing gear set is fixedly connected to the bottom surface of the driven ratchet. A threaded sleeve is fixedly connected to the outer surface of the meshing gear set. A lifting thread is threaded onto the inner surface of the threaded sleeve.

[0015] Preferably, the inner actuating column is slidably connected to the inner actuating groove, the pushing pawl is in contact with the driven ratchet, the meshing gear set consists of a pair of meshing spur gears with different numbers of teeth, and the two gears are respectively fixedly connected to the driven ratchet and the threaded sleeve, the lifting thread passes through the meshing gear set and the lifting platform, and the lifting thread is rotatably connected to the side base.

[0016] Preferably, the lifting switching component includes a switching motor, which is fixedly connected to the inner surface of the extension lever. The output end of the switching motor is fixedly connected to the switching lever. A spring mounting block is slidably connected to the inner surface of the switching lever. A pressure spring is fixedly connected to the outer surface of the spring mounting block. A sliding connecting block is fixedly connected to the other end of the pressure spring. A sliding connecting groove is provided on the outer surface of the pushing pawl.

[0017] Preferably, the spring mounting block is slidably connected to the inner surfaces of the extension lever and the switching lever, and the sliding connecting block is slidably connected to the inner surface of the sliding connecting groove.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] In this invention, the centering and correction of fuel assemblies are achieved through the combined action of cross grids and a centering and correction mechanism. The cross grids of the device are inserted into the fuel assembly from both the longitudinal and transverse directions to form a grid structure. They can be inserted into the fuel assembly at any position for correction by their mutually perpendicular insertion. The centering and correction mechanism uses the synergistic action of a rotating crank and a misaligned connecting column to push the grid base to move laterally or longitudinally, causing the four sides of the spacer slots formed by the cross grids to shrink inward synchronously, bringing the fuel assembly towards the center, thereby achieving centering and correction and ensuring that the fuel assembly is accurately positioned in the nuclear reactor without any deviation.

[0020] In this invention, the centering drive mechanism and the passive lifting column work together to achieve flexible expansion of the correction range. After centering and correction at the current position is completed, the centering and verticality correction at different positions are achieved by continuously clamping and releasing while lifting. The entire lifting platform and cross grid achieve lifting and lowering movement. Even when the servo motor rotates forward and backward or back and forth, the lifting direction remains unchanged, thereby ensuring that the correction range continues to expand as the lifting platform continues to lift, covering every part of the fuel assembly that needs correction.

[0021] In this invention, the lifting switch component simultaneously switches the lifting direction and rotates the passive lifting column, changing the pressure direction of the pressure spring on the push pawl, thereby switching the contact angle between the push pawl and the driven ratchet. This allows for flexible control of the lifting direction of the lifting platform. The entire device highly integrates components such as the cross grid, centering correction mechanism, centering drive mechanism, passive lifting column, and lifting switch component into the side base and inside the lifting platform, forming a compact overall structure. This facilitates quick installation onto the side of the fuel assembly, allowing for immediate use without complex debugging. Furthermore, it can adapt to fuel assemblies of different sizes and types, demonstrating strong versatility and practicality. Attached Figure Description

[0022] Figure 1 is a top view of the overall structure of the present invention;

[0023] Figure 2 is a side view of the overall structure of the present invention;

[0024] Figure 3 is a schematic diagram of the structure in which the movable outer shell and the grid plate of the present invention cooperate with each other;

[0025] Figure 4 is a schematic diagram of the structure in which the movable outer shell and the grid base of the present invention cooperate with each other.

[0026] Figure 5 is a schematic diagram of the structure in which the grid base and the reset spring cooperate with each other according to the present invention;

[0027] Figure 6 is a schematic diagram of the interaction between the driven actuating groove and the misaligned connecting column of the present invention.

[0028] Figure 7 is a schematic diagram of the grid base of the present invention after it is staggered;

[0029] Figure 8 is a schematic diagram of the grid inserts after they are staggered according to the present invention;

[0030] Figure 9 is a schematic diagram of the cooperation structure between the side base and the lifting platform of the present invention;

[0031] Figure 10 is a schematic diagram of the mutual cooperation between the lifting platform and the lifting thread of the present invention;

[0032] Figure 11 is a schematic diagram of the structure of the lifting platform and servo motor of the present invention working together.

[0033] Figure 12 is a schematic diagram of the interoperation structure of the various components of the centering drive mechanism of the present invention;

[0034] Figure 13 is a schematic diagram of the cooperation structure between the active cam and the active pusher of the present invention;

[0035] Figure 14 is a schematic diagram of the cooperation structure between the inner rotating disk and the driven lever arm of the present invention.

[0036] Figure 15 is an exploded view of the motion flow of the inner rotating disk and the driven lever arm of the present invention.

[0037] Figure 16 is a schematic diagram of the interaction between the push pawl and the driven lever of the present invention.

[0038] Figure 17 is an exploded view of the motion flow of the driving pawl and the driven ratchet of the present invention;

[0039] Figure 18 is a schematic diagram of the interaction between the driven ratchet and the threaded sleeve of the present invention;

[0040] Figure 19 is a schematic diagram of the interoperation structure of the various components of the lifting switching component of the present invention;

[0041] Figure 20 is a schematic diagram of the interaction between the switching motor and the switching lever of the present invention.

[0042] Figure 21 is a schematic diagram of the structure in which the sliding connecting block and the pushing pawl cooperate with each other according to the present invention;

[0043] Figure 22 is an exploded view of the motion flow of the pressure spring and the driving pawl of the present invention;

[0044] Figure 23 is a schematic diagram of the interoperation structure of the components of the passive lifting column of the present invention;

[0045] Figure 24 is a schematic diagram of the cooperation structure between the lifting platform and the threaded sleeve of the present invention;

[0046] Figure 25 is a schematic diagram of the interaction between the side shell and the movable shell of the present invention.

[0047] In the diagram: 1. Side base; 11. Lifting platform; 12. Side outer shell; 121. Movable outer shell; 13. Fuel pack model; 2. Cross grid; 21. Grid base; 211. Driven actuation slot; 22. Displacement limit post; 221. Return spring; 23. Grid insert plate; 24. Drive cylinder; 3. Centering correction mechanism; 31. Fixed bracket; 32. Rotating crank; 321. Misalignment connecting post; 33. Linkage push rod; 331. Height matching groove; 34. Active push block; 341. Height matching block; 4. Centering drive mechanism; 41. Servo 42. Drive belt; 43. Input worm gear; 431. Output worm wheel; 44. Driving cam; 5. Passive lifting column; 51. Inner rotating disk; 511. Inner actuating column; 52. Driven lever arm; 521. Inner actuating groove; 522. Extension lever arm; 53. Push pawl; 54. Driven ratchet; 55. Meshing gear set; 56. Threaded sleeve; 57. Lifting thread; 6. Lifting switching component; 61. Switching motor; 62. Switching lever arm; 63. Spring mounting block; 64. Compression spring; 65. Sliding connecting block; 651. Sliding connecting groove. Detailed Implementation

[0048] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0049] Please refer to Figures 1 to 25. The present invention provides a technical solution: a calibration device for new nuclear power fuel assemblies, including a side base 1, a lifting platform 11 slidably connected to the outer surface of the side base 1, side shells 12 fixedly connected to both sides of the lifting platform 11, a cross grid 2 provided on the inner surface of the side shell 12, a centering correction mechanism 3 provided on the outer surface of the cross grid 2, a centering drive mechanism 4 provided on the inner surface of the lifting platform 11, a passive lifting column 5 provided on the inner surface of the lifting platform 11, and a lifting switching component 6 provided on the outer surface of the passive lifting column 5.

[0050] A movable outer shell 121 is slidably connected to the inner surface of the side shell 12, and a fuel pack model 13 is slidably connected to the inner surface of the cross grid 2.

[0051] The cross grid 2 includes a grid base 21, which is slidably connected to the outer surface of the movable housing 121. The outer surface of the grid base 21 is provided with a driven actuation groove 211. The inner surface of the grid base 21 is slidably connected with a displacement limiting post 22. The outer surface of the displacement limiting post 22 is fixedly connected with a return spring 221. The outer surface of the grid base 21 is fixedly connected with equidistantly distributed grid inserts 23. The inner surface of the side housing 12 is fixedly connected with a drive cylinder 24.

[0052] There are two grid bases 21 in each movable housing 121, and the grid bases 21 on both sides are stacked and perpendicular to each other. The driven toggle slots 211 are evenly distributed. There are four return springs 221, which are symmetrically distributed on both sides of the displacement limiting post 22. The two ends of the return springs 221 are fixedly connected to the inner surface of the displacement limiting post 22 and the grid base 21, respectively. The output end of the drive cylinder 24 is fixedly connected to the outer surface of the movable housing 121.

[0053] By setting up the intersecting grid 2, grid inserts 23 are inserted from both directions of the fuel rod to form a grid, thus correcting centering and verticality. During use, the grid base 21 is used to install the grid inserts 23, and the movable outer shell 121 is used to install other components. The movable outer shell 121 moves under the control of the drive cylinder 24. In the initial state, the drive cylinder 24 is retracted, and the grid bases 21 and grid inserts 23 on both sides are retracted into the side base 1. When the drive cylinder 24 extends, the four grid bases 21 on both sides are at different heights, and the grid bases 21 on both sides are perpendicular to each other. After intersecting, they form a grid. The fuel pack model 13 serves as the model. The simulated solid model is used in the slots between the grid gaps. Each grid plate 23 restricts the longitudinal or lateral displacement of the fuel pack model 13, but the fuel pack model 13 can still move longitudinally or laterally in the individual grid plates 23. When two grid plates 23 intersect, the displacement in both directions is restricted, so that the position of the fuel pack model 13 is restricted in the slots. Since the grid plates 23 are inserted from both sides and their heights do not overlap, they can be inserted from any height of the fuel pack model 13 to form a grid. Even if other components are installed at both ends or on the outer shell of the fuel pack model 13, they can be inserted for correction at any unobstructed height, which has better adaptability when correcting.

[0054] The centering and correction mechanism 3 includes a fixed bracket 31, which is fixedly connected to the inner surface of the movable housing 121. A rotating crank 32 is rotatably connected to the outer surface of the fixed bracket 31. Symmetrically distributed misaligned connecting columns 321 are fixedly connected to the outer surface of the rotating crank 32. A linkage push rod 33 is rotatably connected to the outer surface of the rotating crank 32. A height matching groove 331 is opened on the outer surface of the linkage push rod 33. An active push block 34 is slidably connected to the outer surface of the linkage push rod 33. A height matching block 341 is fixedly connected to the outer surface of the active push block 34.

[0055] The fixed bracket 31 is fixedly connected to the displacement limiting column 22, the rotating crank 32 is evenly distributed, the misaligned connecting column 321 is slidably connected to the inner surface of the driven actuating groove 211, the active push block 34 is slidably connected to the inner surface of the side shell 12, and the height matching block 341 is slidably connected to the inner surface of the height matching groove 331.

[0056] By setting the centering correction mechanism 3, the two grid plates 23 on each side are staggered by rotating crank 32, reducing the size of the gap in the middle and achieving centering correction. During use, when the grid plates 23 on both sides overlap, the fuel pack model 13 is in the gap. Pushing the active push block 34 will drive the linkage push rod 33 to move. The linkage push rod 33 will simultaneously push all the rotating cranks 32 from above. Since the rotation center of the rotating crank 32 is on the fixed bracket 31, the fixed bracket 31 cannot move, so that the top of the rotating crank 32 will rotate around the rotation center after being pushed, and the top and bottom ends move in opposite directions. The rotating crank 32 moves by moving the driven actuating groove 211 on the grid base 21 through the misaligned connecting column 321. The displacement limiting column 22 restricts the range of movement of the grid base 21, so that the grid base 21 can only move laterally or longitudinally.

[0057] Since the misaligned connecting columns 321 are symmetrically distributed on the rotating crank 32 and are at the same distance from the rotation center, the displacement of the upper and lower misaligned connecting columns 321 is the same when the rotating crank 32 rotates. Since the path traversed by the misaligned connecting columns 321 is an arc, the height position will change. The height change is adapted by sliding up and down in the driven actuating groove 211. Similarly, the active push block 34 adapts to the height change of the linkage push rod 33 by sliding up and down in the height matching groove 331 on the linkage push rod 33 through the height matching block 341.

[0058] The top and bottom grid plates 23 are displaced by the same distance in different directions. The displacement of the grid plates 23 is generated by the active push block 34. During the movement, since the position of the displacement limiting post 22 remains unchanged, the grid base 21 will squeeze or stretch the reset spring 221. When the active push block 34 no longer applies force, the reset spring 221 resets the grid base 21 and the grid spacing returns to the initial size.

[0059] After the grid plates 23 are inserted perpendicularly to each other, a grid-like groove is created through the gaps between them. The fuel pack model 13 is located in the gap groove. When the grid plates 23 move, the gap between the grooves decreases. Since the displacement distance of the two grid plates 23 on each side is the same but the direction is different, the gap decreases simultaneously from both sides. Through the joint action of the four grid plates 23 on both sides, the four sides of the gap groove change simultaneously, so that the center position of the gap groove remains unchanged. Thus, while clamping the fuel pack model 13, it is pushed towards the center, thereby ensuring the centering of the fuel pack model 13.

[0060] The centering drive mechanism 4 includes a servo motor 41, which is fixedly connected to the inner surface of the lifting platform 11. The output end of the servo motor 41 is fitted with a transmission belt 42, and the other end of the transmission belt 42 is fitted with an input worm gear 43. The outer surface of the input worm gear 43 is engaged with an output worm wheel 431, and the two ends of the output worm wheel 431 are fixedly connected with an active cam 44.

[0061] There are two transmission belts 42 and two input worm gears 43, which are symmetrically distributed on both sides of the servo motor 41. The input worm gears 43 are rotatably connected to the inner surface of the lifting platform 11. The output worm wheel 431 and the active cam 44 are both rotatably connected to the inner surface of the lifting platform 11. The active cam 44 is in contact with the outer surface of the active push block 34.

[0062] By setting the centering drive mechanism 4, the centering drive mechanism 4 is used to simultaneously drive the centering correction mechanisms 3 on both sides, controlling the size of the interval slot while ensuring centering. During use, the servo motor 41 drives the input worm gears 43 on both sides to rotate through the transmission belt 42. The input worm gears 43 mesh with the output worm wheel 431, simultaneously driving the two active cams 44 at both ends to rotate, and pushing the active push block 34 to control the size of the interval slot of the grid plate 23. The input worm gears 43 and the output worm wheel 431 play a role in deceleration and self-locking, and the linkage push The moving rod 33 cannot push the active cam 44 in the reverse direction. The active cam 44 is in the shape of a constant speed spiral. The distance from each point on the upper edge of the active cam 44 to the center of the output worm gear 431 increases proportionally with the rotation angle, so that the distance by which the active cam 44 pushes the active push block 34 is controllable. When the active cam 44 reverses and retracts, the active push block 34 is not pushed and is reset under the action of the reset spring 221. By controlling the rotation angle and direction of the servo motor 41, the distance by which the active push block 34 is pushed is adjusted, thereby controlling the size of the interval slot formed by the cross grid 2.

[0063] Since the transmission is achieved through the drive belt 42, when the spacer slot clamps the fuel assembly and can no longer move inward, the drive belt 42 will slip, thereby preventing over-clamping and providing buffer time for the servo motor 41 to reverse.

[0064] The passive lifting column 5 includes an inner rotating disk 51, which is fixedly connected to the output end of the servo motor 41. An inner actuating column 511 is fixedly connected to the outer surface of the inner rotating disk 51. A driven lever 52 is rotatably connected to the inner surface of the lifting platform 11. An inner actuating groove 521 is provided on the outer surface of the driven lever 52. An extension lever 522 is fixedly connected to one end of the driven lever 52. A push pawl 53 is rotatably connected to the outer surface of the extension lever 522. A driven ratchet 54 is rotatably connected to the inner surface of the lifting platform 11. A meshing gear set 55 is fixedly connected to the bottom surface of the driven ratchet 54. A threaded sleeve 56 is fixedly connected to the outer surface of the meshing gear set 55. A lifting thread 57 is threadedly connected to the inner surface of the threaded sleeve 56.

[0065] The inner actuating column 511 is slidably connected to the inner actuating groove 521, pushing the pawl 53 to contact the driven ratchet 54. The meshing gear set 55 consists of a pair of meshing spur gears with different numbers of teeth, and the two gears are fixedly connected to the driven ratchet 54 and the threaded sleeve 56 respectively. The lifting thread 57 passes through the meshing gear set 55 and the lifting platform 11, and the lifting thread 57 is rotatably connected to the side base 1.

[0066] With the setting of the passive lifting column 5, the rotation direction of the driven ratchet 54 is independent of the rotation direction of the servo motor 41. During the continuous clamping of the fuel pack model 13, the entire cross grid 2 still moves in one direction. During use, the servo motor 41 will drive the inner rotating disk 51 to rotate, whether it rotates forward or backward. The inner rotating disk 51 will push the inner pushing groove 521 of the driven pushing arm 52 through the inner pushing column 511, causing the driven pushing arm 52 to swing back and forth, thereby converting the rotation into a reciprocating swing. The reciprocating swing has no direction.

[0067] Driven lever 52 drives extended lever 522 and bottom push pawl 53 to reciprocate. Push pawl 53 can rotate on extended lever 522, but is pressed by compression spring 64, keeping push pawl 53 close to driven ratchet 54. Since each end of push pawl 53 has a ramp and a flat surface, when push pawl 53 is pulled backward by driven lever 52 towards the ramp, the rear ramp will slide across the surface of driven ratchet 54. The reaction force of driven ratchet 54 is upward, causing push pawl 53 to tilt up, thus having no effect on driven ratchet 54. When driven lever 52... When 52 moves forward, the front plane contacts the driven ratchet 54. At this time, the reaction force of the driven ratchet 54 is downward, and the push pawl 53 cannot rotate downward. During the forward movement, the push pawl 53 will push the driven ratchet 54 forward and rotate it. The driven ratchet 54 drives the small gear in the meshing gear set 55 to rotate. The small gear drives the large gear to rotate, which plays the role of deceleration and changing the rotation position. It also drives the outer threaded sleeve 56 to rotate. The threaded sleeve 56 drives the entire lifting platform 11 and the cross grid 2 to rise and fall through the threaded transmission with the lifting thread 57.

[0068] Since the rotation of the driven ratchet 54 is achieved by the push of the pawl 53, and the push pawl 53 follows the reciprocating swing of the driven lever 52, and the reciprocating swing has no direction, the rotation direction of the driven ratchet 54 is not affected by whether the servo motor 41 rotates forward or backward or reciprocates. Thus, the lifting direction of the entire lifting platform 11 and the cross grid 2 will not change, regardless of whether the cross grid 2 is clamped or loosened, or whether the fuel pack model 13 is intermittently tightened or loosened.

[0069] The lifting switching component 6 includes a switching motor 61, which is fixedly connected to the inner surface of the extension lever 522. The output end of the switching motor 61 is fixedly connected to the switching lever 62. The inner surface of the switching lever 62 is slidably connected to a spring mounting block 63. The outer surface of the spring mounting block 63 is fixedly connected to a pressure spring 64. The other end of the pressure spring 64 is fixedly connected to a sliding connecting block 65. The outer surface of the push pawl 53 is provided with a sliding connecting groove 651.

[0070] The spring mounting block 63 is slidably connected to the inner surfaces of the extension lever 522 and the switching lever 62, and the sliding connecting block 65 is slidably connected to the inner surface of the sliding connecting groove 651.

[0071] By setting the lifting switch 6, the lifting switch 6 is used to switch the angle of the push pawl 53 to control the rotation direction of the driven ratchet 54, and thus control the lifting direction of the entire device. During use, the push pawl 53 can rotate on the extension arm 522, but it will be pressed by the pressure spring 64 so that the push pawl 53 is in close contact with the driven ratchet 54. The pressure spring 64 can move to the other side of the extension arm 522 with the spring mounting block 63, thereby pressing the other side of the push pawl 53. At this time, the push pawl 53 on this side will be pressed down, while the side that was originally pressed down will be raised up, thereby realizing the switching of the rotation direction of the push pawl 53. When the push pawl 53 rotates to the other side, its contact direction with the driven ratchet 54 will also change. Originally, when it was moving backward, it was inclined surface contact, now it is flat surface contact when it was moving backward. Originally, when it was moving forward, it was flat surface contact, now it is inclined surface contact when it was moving forward. In this way, when the driven arm 52 swings back and forth, the rotation direction of the driven ratchet 54 becomes opposite.

[0072] The switching motor 61 drives the switching arm 62 to rotate, which moves the spring mounting block 63 from the extension arm 522 to the other side. The spring mounting block 63 connects the pressure spring 64 and the sliding connecting block 65. The sliding connecting block 65 slides on the push pawl 53 through the sliding connecting groove 651, thereby keeping the pressure spring 64 and the push pawl 53 always connected.

[0073] In addition to causing the push pawl 53 to rotate as it approaches the driven ratchet 54, the pressure spring 64 also serves to switch the rotation direction of the push pawl 53.

[0074] In this embodiment, as shown in Figures 1 and 2, the fuel rods are usually arranged in a 17*17 array. In this example, 5*5 is used instead. After the grid plates 23 on both sides overlap, they form a grid-like spacer slot. The fuel pack model 13 is placed inside to correct the centering.

[0075] In this embodiment, as shown in Figures 3 and 24, the cross grids 2 on both sides have the same structure, but different heights and directions. The different heights intersect to form a grid, and the cross grids 2 are housed inside the side shell 12, thus removing the restriction on the fuel pack model 13.

[0076] In this embodiment, as shown in Figures 3, 4, 5 and 6, the two grid bases 21 on each side are moved to both sides by rotating the crank 32;

[0077] In this embodiment, as shown in FIG7, after the grid base 21 is moved, the size of the slot decreases, but the fuel pack model 13 remains in the middle position and does not deviate to one side.

[0078] In this embodiment, as shown in Figures 9 and 10, the lifting platform 11 drives the side shells 12 on both sides to rise and fall, and the cross grid 2 and the centering correction mechanism 3 also rise and fall accordingly.

[0079] In this embodiment, as shown in Figures 11, 12, and 13, the servo motor 41 drives the active cam 44 to push the centering and correction mechanisms 3 on both sides to control the size of the interval slot.

[0080] In this embodiment, as shown in Figures 14 and 15, the servo motor 41 simultaneously drives the inner rotating disk 51 to rotate, thereby repeatedly moving the driven lever 52.

[0081] In this embodiment, as shown in Figures 16 and 17, the reciprocating movement of the driven lever 52 drives the push pawl 53 to push the driven ratchet 54, and the movement direction of the driven ratchet 54 is controlled by the angle of the push pawl 53, and is independent of the direction of rotation of the servo motor 41.

[0082] In this embodiment, as shown in FIG18, the entire lifting platform 11 is raised and lowered by threaded transmission;

[0083] In this embodiment, as shown in Figures 19, 20, and 21, the pressure spring 64 not only causes the push pawl 53 to rotate when it comes into contact with the driven ratchet 54, but also switches the rotation direction of the push pawl 53.

[0084] In this embodiment, as shown in FIG22, the pressure spring 64 moves to different sides, which will push the pawl 53 to rotate to different sides, thereby controlling the rotation direction of the driven ratchet 54;

[0085] In this embodiment, as shown in Figures 23 and 24, the centering drive mechanism 4, the passive lifting column 5, and the lifting switching component 6 are installed inside the lifting platform 11 and move up and down with the lifting platform 11.

[0086] The method of use and advantages of the present invention: A calibration device for new nuclear power fuel assemblies, the working process of which is as follows:

[0087] As shown in Figures 1 to 25, when in use, place the entire device on the side of the fuel assembly, start the servo motor 41, and move the lifting platform 11 to the required correction height by reciprocating forward and reverse rotation.

[0088] The start-up drive cylinder 24 pushes out the movable housings 121 on both sides and the cross grid 2, which intersect perpendicularly and form a grid-like interval slot in the middle, with the fuel assembly inside the interval slot;

[0089] Start the servo motor 41, which pushes the linkage push rod 33 through the active cam 44, so that the two grid plates 23 on each side are staggered, and the four sides of the interval slot move inward at the same time to reduce the interval, pushing the fuel group inward and clamping the fuel assembly. Since the four sides move synchronously and the center position remains unchanged, the fuel assembly is gathered inward to maintain centering.

[0090] Once clamping is complete and the current height alignment is calibrated, the servo motor 41 switches to reciprocating forward and reverse rotation, intermittently loosening and clamping the fuel assembly again. Since the servo motor 41 is still rotating, the threaded sleeve 56 continuously rises or falls through the action of the lifting thread 57, thereby changing the clamping position and ultimately achieving alignment calibration at every point of the fuel assembly.

[0091] When the lifting platform 11 cannot be raised or lowered or needs to be moved in the opposite direction, the switching motor 61 is started to move the switching arm 62 to the other side, pushing the pawl 53 to rotate. At this time, the servo motor 41 rotates, which will cause the lifting platform 11 to move in the opposite direction.

[0092] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A calibration device for new nuclear power fuel assemblies, comprising a side base (1), characterized in that: A lifting platform (11) is slidably connected to the outer surface of the side base (1). Side housings (12) are fixedly connected to both sides of the lifting platform (11). The inner surface of the side housings (12) is provided with cross grids (2) that can be inserted from the fuel assembly for correction at any time. The outer surface of the cross grids (2) is provided with a centering correction mechanism (3) for centering and perpendicularity correction of the fuel assembly. The inner surface of the lifting platform (11) is provided with a centering drive mechanism (4) for centering correction through clamping. The lifting platform (11)... The inner surface of the cross grid (2) is provided with a passive lifting column (5) that increases the correction range by raising and lowering during correction. The outer surface of the passive lifting column (5) is provided with a lifting switching component (6) that controls the lifting direction so that the lifting direction is independent of the correction direction. The cross grid (2) includes a grid base (21). The outer surface of the grid base (21) is provided with a driven actuating groove (211). The inner surface of the grid base (21) is slidably connected with a displacement limiting column (22). The outer surface of the displacement limiting column (22) is fixedly connected with a return spring. 221), the outer surface of the grid base (21) is fixedly connected with equidistantly distributed grid inserts (23), and the inner surface of the side shell (12) is fixedly connected with a drive cylinder (24); the centering correction mechanism (3) includes a fixed bracket (31), the outer surface of the fixed bracket (31) is rotatably connected with a rotating crank (32), the outer surface of the rotating crank (32) is fixedly connected with symmetrically distributed staggered connecting columns (321), and the outer surface of the rotating crank (32) is rotatably connected with a linkage push rod (33), so An active push block (34) is slidably connected to the outer surface of the linkage push rod (33); the centering drive mechanism (4) includes a servo motor (41), the servo motor (41) is fixedly connected to the inner surface of the lifting platform (11), the output end of the servo motor (41) is fitted with a transmission belt (42), the other end of the transmission belt (42) is fitted with an input worm gear (43), the outer surface of the input worm gear (43) is meshed with an output worm wheel (431), and the two ends of the output worm wheel (431) are fixedly connected with active cams (44).

2. The calibration device for new nuclear power fuel assemblies according to claim 1, characterized in that: The inner surface of the side shell (12) is slidably connected to a movable shell (121), and the inner surface of the cross grid (2) is slidably connected to a fuel pack model (13).

3. The calibration device for new nuclear power fuel assemblies according to claim 2, characterized in that: The grid base (21) is slidably connected to the outer surface of the movable housing (121).

4. The calibration device for new nuclear power fuel assemblies according to claim 3, characterized in that: The fixed bracket (31) is fixedly connected to the inner surface of the movable outer shell (121).

5. The calibration device for new nuclear power fuel assemblies according to claim 4, characterized in that: The passive lifting column (5) includes an inner rotating disk (51), which is fixedly connected to the output end of a servo motor (41). A driven lever (52) is rotatably connected to the inner surface of the lifting platform (11). An extension lever (522) is fixedly connected to one end of the driven lever (52). A push pawl (53) is rotatably connected to the outer surface of the extension lever (522). A driven ratchet (54) is rotatably connected to the inner surface of the lifting platform (11).

6. The calibration device for new nuclear power fuel assemblies according to claim 5, characterized in that: The driven ratchet (54) has a meshing gear set (55) fixedly connected to its bottom surface, a threaded sleeve (56) fixedly connected to its outer surface, and a lifting thread (57) threadedly connected to its inner surface.

7. The calibration device for new nuclear power fuel assemblies according to claim 6, characterized in that: The lifting switching component (6) includes a switching motor (61), which is fixedly connected to the inner surface of the extension lever (522). The output end of the switching motor (61) is fixedly connected to the switching lever (62). The inner surface of the switching lever (62) is slidably connected to a spring mounting block (63). The outer surface of the spring mounting block (63) is fixedly connected to a pressure spring (64). The other end of the pressure spring (64) is fixedly connected to a sliding connecting block (65). A sliding connecting groove (651) is provided on the outer surface of the push pawl (53).

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