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CN-122000095-A - Automatic assembling die and method for surface contact of nuclear fuel assembly grid

CN122000095ACN 122000095 ACN122000095 ACN 122000095ACN-122000095-A

Abstract

The application provides a surface contact automatic assembly die and a surface contact automatic assembly method for a nuclear fuel assembly grid, wherein a clamp body is provided with a first channel and a second channel which are crossed along a vertical first horizontal direction and a vertical second horizontal direction, a plurality of compression structures at one side of the first channel are matched with a driving structure, and the synchronous driving realizes the uniform force application to a strip; the control unit automatically calculates an average thickness value based on the information, determines target displacement of the driving structure and synchronously executes the compressing action, and then adjusts the displacement according to the comparison result of the actual compressing force and the target range. According to the scheme, the mould is not required to be manually disassembled or replaced or the structure is not required to be adjusted, the non-productive shutdown time is reduced to adapt to the mass production rhythm, the operation is simplified, the operation efficiency is improved, the strip assembly consistency is ensured by accurately adjusting and controlling the clamping force, and the assembly quality of the nuclear fuel assembly grillwork is effectively improved.

Inventors

  • LEI CONGYI
  • Tang dongyang
  • DUAN SHUYONG
  • ZHANG XIAOMIN

Assignees

  • 河北工业大学

Dates

Publication Date
20260508
Application Date
20260212

Claims (10)

  1. 1. A face contact automated assembly mold for a nuclear fuel assembly grid, comprising: The clamp comprises a clamp body (2), wherein a plurality of first channels (3) extending along a first horizontal direction are arranged on the clamp body (2), the first channels (3) are used for accommodating first strips (16), the first strips (16) form a first strip group together, a plurality of second channels (4) extending along a second horizontal direction are also arranged on the clamp body (2), the second channels (4) are used for accommodating second strips (17), the first channels (3) and the second channels (4) are arranged in a crossing manner, and the first horizontal direction is perpendicular to the second horizontal direction; One side of each first channel (3) is provided with a plurality of compression structures, the compression structures are connected with a driving structure, and the driving structure is used for synchronously driving the compression structures to apply compression force to the corresponding first strips (16) laterally; The detection unit is used for detecting the model identification and the overall thickness parameter of the first strip group; The sensing unit is arranged on the pressing structure and close to the first strip (16), the sensing unit is used for detecting actual pressing force applied by the pressing structure, the sensing unit and the detecting unit are electrically connected with the control unit, and the control unit is used for being configured to: Acquiring the model identification and the overall thickness parameter, and calculating to obtain an average thickness value according to the overall thickness parameter; determining a target displacement of the driving structure based on the model identification and the average thickness value; Controlling the driving structure to move the target displacement so as to synchronously drive all the compacting structures to execute compacting actions; Receiving actual compaction force detected by each sensing unit and calculating an average compaction value of the actual compaction force; determining a target compression range based on the model identification; And comparing the average compression value with a preset target compression range, and carrying out displacement adjustment on the driving structure based on a comparison result until the average compression value falls into the target compression range.
  2. 2. The automatic assembling die for the surface contact of the nuclear fuel assembly grid according to claim 1, wherein a plurality of mounting cavities (5) are arranged on one side of each first channel (3), the mounting cavities (5) are communicated with the first channels (3), the mounting cavities (5) are arranged along the first horizontal direction, and the compression structures are arranged in the mounting cavities (5) in a one-to-one correspondence manner; The compaction structure includes: The fixing block (6) is arranged at the top of the mounting cavity (5), a movable cavity (19) is formed in the bottom of the fixing block (6), and a containing cavity communicated with the movable cavity (19) is formed in one side, close to the first strip (16), of the fixing block (6); the connecting rod (7) is arranged in the accommodating cavity, the connecting rod (7) is provided with a first end and a second end, the first end extends out of the first through hole and is connected with a pressing plate (9), and the second end extends into the moving cavity (19); The elastic element (18) is sleeved on the connecting rod (7), one end of the elastic element (18) is fixedly connected with the inner wall of the accommodating cavity, and the other end of the elastic element (18) is fixedly connected with the connecting rod (7); The jacking column (8) is movably arranged in the mounting cavity (5), and one end, far away from the fixed block (6), of the jacking column (8) extends out of the mounting cavity (5) to be connected with the driving structure; The driving structure is used for driving the jacking column (8) to move towards the moving cavity (19), so that the jacking column (8) pushes the connecting rod (7), and then the pressing plate (9) is driven to apply pressing force to the corresponding first strip (16).
  3. 3. The automatic assembling die for the surface contact of the nuclear fuel assembly grid according to claim 2, wherein one end of the jacking column (8) close to the fixed block (6) is of a trapezoid structure, an inclined surface is formed on one side of the trapezoid structure, which faces the connecting rod (7), a first included angle is formed between the extending direction of the inclined surface and the axial direction of the connecting rod (7), an opening of the first included angle faces the connecting rod (7), and the first included angle is an acute angle; The driving structure is used for driving the jacking column (8) to move towards the moving cavity (19), so that the inclined surface pushes the contact surface, and the pressing plate (9) is driven to apply pressing force to the corresponding first strip (16).
  4. 4. The automated assembly mold for the surface contact of a nuclear fuel assembly grid according to claim 1, wherein the detection unit comprises: the laser thickness gauge is electrically connected with the control unit and is used for detecting the thickness of all the first strips (16) so as to generate the integral thickness parameter; The visual identification module is electrically connected with the control unit and is used for identifying the characteristic image of the first strip (16) so as to determine the model identification of the first strip (16).
  5. 5. A face contact automated assembly mold for a nuclear fuel assembly grid according to claim 3, wherein the drive structure comprises: the driving plate (10) is arranged at the bottom of the clamp body (2), and the driving plate (10) is fixedly connected with all the jacking columns (8); the first driving piece is connected with the driving plate (10), and is used for driving the driving plate (10) to drive the top column (8) to move in the mounting cavity (5).
  6. 6. The automatic assembling die for the surface contact of the nuclear fuel assembly grid according to claim 1, further comprising a die frame (1), wherein a first space is formed inside the die frame (1), the clamp body (2) is arranged in the first space, a grid tray (15) is movably arranged in the first space, and the grid tray (15) is used for ejecting the formed nuclear fuel assembly grid after the assembling is completed.
  7. 7. A surface contact automated assembly method of a nuclear fuel assembly grid, employing a surface contact automated assembly mold of a nuclear fuel assembly grid as set forth in any one of claims 1-6, comprising the steps of: Acquiring the model identification and the overall thickness parameter, and calculating to obtain an average thickness value according to the overall thickness parameter; determining a target displacement of the driving structure based on the model identification and the average thickness value; Sequentially placing the first strips into the first channels, wherein a plurality of first strips form a first strip group; Controlling the driving structure to move the target displacement so as to synchronously drive all the compacting structures to execute compacting actions; Receiving actual compaction force detected by each sensing unit and calculating an average compaction value of the actual compaction force; determining a target compression range based on the model identification; comparing the average compression value with the target compression range, and performing displacement adjustment on the driving structure based on a comparison result until the average compression value falls within the target compression range; and sequentially placing the second strips into the corresponding second channels, and crossing and jogging the second strips with the first strips which are fixed by the correction to form the nuclear fuel assembly grid.
  8. 8. The method of automated face contact assembly of a nuclear fuel assembly grid of claim 7, wherein determining a target displacement of a drive structure based on the model identification and the average thickness value comprises the steps of: Inquiring a strip database, wherein the strip database at least comprises a plurality of model identifiers, and attaching redundancy quantity and elasticity compensation coefficients corresponding to each model identifier; Traversing the strip database, and selecting a fitting redundancy amount and an elastic compensation coefficient corresponding to the current model identification; calculating target displacement of the driving structure through a formula I based on the lamination redundancy, the elastic force compensation coefficient and the average thickness value; formula one; H is target displacement, H is the distance between the initial position of the compacting plate and the opposite side wall of the first channel, and t is an average thickness value; For attaching redundancy, K is elasticity compensation coefficient, and theta is a first included angle.
  9. 9. The method of automated face contact assembly of a nuclear fuel assembly grid of claim 8, wherein determining a target compression range based on the model identification comprises the steps of: querying the strip database, wherein the strip database further comprises a target compaction range corresponding to each model identifier; traversing the strip database, and selecting a target compression range corresponding to the current model identification.
  10. 10. The method of automated face contact assembly of a nuclear fuel assembly grid of claim 7, wherein comparing the average compression value to a target compression range and adjusting displacement of the drive structure based on the comparison until the average compression value falls within the target compression range comprises the steps of: if the average compression value is greater than or equal to the upper limit value of the target compression range, controlling the driving structure to move in a direction away from the clamp body so as to reduce the compression force until the average compression value falls into the target compression range; If the average compression value is smaller than or equal to the lower limit value of the target compression range, controlling the driving structure to move towards the direction close to the clamp body so as to increase the compression force until the average compression value falls into the target compression range; And if the average compaction value is within the target compaction range, keeping the position of the driving structure unchanged.

Description

Automatic assembling die and method for surface contact of nuclear fuel assembly grid Technical Field The application relates to the technical field of assembly grillwork assembly, in particular to a surface contact automatic assembly die and method for a nuclear fuel assembly grillwork. Background The nuclear fuel grid is a key supporting structure of a nuclear fuel assembly, and has the functions of realizing accurate positioning and interval maintenance of fuel rods by precisely assembling a plurality of thin-wall metal strips into a honeycomb grid and optimizing the flowing state of a coolant by means of an integrated stirring wing structure. The quality of the assembly of the grid is thus directly related to the safety of the operation of the reactor, to the thermal performance and to the long-term reliability. In the prior art, the traditional method relies on manual work to carry out strip identification, feeding and tool replacement, and because the strip specifications are various, the whole set of die is required to be disassembled and recombined frequently when tools of different types are replaced, so that the non-productive downtime is obviously increased, and the method is difficult to adapt to the rhythm of mass production. In addition, the strips are usually made of thin-wall zirconium alloy through stamping, the structural rigidity is weak, the strips are easy to warp or deform plastically due to uneven force application in the clamping process of the traditional clamp, meanwhile, the existing clamp generally lacks self-adaptive adjusting capability, when the strips with different thicknesses are faced, the mechanical structure is required to be manually adjusted or a special clamping module is required to be replaced, the operation is complex, the efficiency is low, the accurate control of the clamping force is difficult to realize, and the assembly consistency and the quality of finished products are further influenced. Disclosure of Invention In view of the foregoing drawbacks or shortcomings in the prior art, it is desirable to provide a face contact automated assembly mold and method for a nuclear fuel assembly grid that addresses the foregoing problems. In a first aspect, the present application provides a face contact automated assembly mold for a nuclear fuel assembly grid, comprising: The clamp comprises a clamp body, wherein a plurality of first grooves extending along a first horizontal direction are formed in the clamp body, the first grooves are used for accommodating first strips, and the first strips jointly form a first strip group; the clamp body is also provided with a plurality of second channels extending along a second horizontal direction, and the second channels are used for accommodating second strips; the first channel and the second channel are arranged in a crossing way, and the first horizontal direction is perpendicular to the second horizontal direction; A plurality of compression structures are arranged on one side of each first channel, the compression structures are connected with a driving structure, and the driving structure is used for synchronously driving the compression structures to apply compression force to the corresponding first strips laterally; The detection unit is used for detecting the model identification and the overall thickness parameter of the first strip group; The sensing unit is arranged on the pressing structure and close to the first strip, the sensing unit is used for detecting actual pressing force applied by the pressing structure, the sensing unit and the detecting unit are electrically connected with the control unit, and the control unit is configured to: Acquiring the model identification and the overall thickness parameter, and calculating to obtain an average thickness value according to the overall thickness parameter; determining a target displacement of the driving structure based on the model identification and the average thickness value; Controlling the driving structure to move the target displacement so as to synchronously drive all the compacting structures to execute compacting actions; Receiving actual compaction force detected by each sensing unit and calculating an average compaction value of the actual compaction force; determining a target compression range based on the model identification; And comparing the average compression value with a preset target compression range, and carrying out displacement adjustment on the driving structure based on a comparison result until the average compression value falls into the target compression range. According to the technical scheme provided by the application, one side of each first channel is provided with a plurality of mounting cavities, the mounting cavities are communicated with the first channels, the mounting cavities are arranged along the first horizontal direction, and the compression structures are arranged in the mounting cavities in a one-to-one corres