Automated Grinding Machine for Nuclear Fuel Spacer Grids
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Solution Overview
Problem
The manual grinding of Inconel spacer grids in nuclear fuel assemblies is inefficient, leading to high labor intensity, potential musculoskeletal diseases, and poor working conditions due to noise and dust, with difficulty in achieving precise and uniform grinding results.
Innovation Solution
A machine comprising a spacer grid holding unit, rotary index table, and rectangular coordinates robots for automated grinding of the outer surface and corners, controlled by a unit that measures and adjusts grinding depth and inclination, allowing for precise and uniform grinding of all surfaces and corners.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If manual grinding method is used, then grinding precision can be maintained, but productivity is low and labor intensity is high
Solution Approach 1:
The patent replaces the manual mechanical grinding system with an automated grinding machine that uses computer-controlled mechanisms. The machine includes automated positioning systems, controlled grinding wheels, and programmable operations that eliminate manual labor while maintaining precise grinding of spacer grid components.
Solution Approach 2:
The grinding machine is designed to perform multiple operations automatically without continuous human intervention. The system includes self-positioning mechanisms, automatic tool changes, and programmable sequences that allow the machine to service itself through automated cycles, thereby increasing productivity while maintaining precision.
2Manufacturing precision
If manual grinding operation is used, then quality control is possible, but working conditions are poor due to noise and dust
Solution Approach 1:
The patent replaces manual grinding operations with an automated grinding machine that encloses the grinding process. This substitution eliminates direct human exposure to noise and dust generated during grinding, while the machine's controlled environment maintains quality through precise automated operations and integrated dust collection systems.
Solution Approach 2:
The grinding machine creates a controlled environment that isolates operators from harmful factors. The enclosure system captures dust at the source, and the automated operation reduces noise exposure, effectively creating a protective atmosphere for workers while maintaining grinding quality through controlled conditions.
3Productivity
If automated grinding machine is introduced, then productivity increases, but device complexity increases
Solution Approach 1:
The grinding machine is designed as a multi-functional device that can perform various grinding operations on different spacer grid components. The machine includes interchangeable tools, programmable controls, and adjustable positioning systems that allow it to handle multiple tasks, thereby justifying its complexity through increased productivity and versatility.
Solution Approach 2:
The patent introduces a control system as an intermediary between the operator and the complex grinding mechanisms. This control interface simplifies operation by managing the complexity of automated functions, tool changes, and positioning systems, allowing the machine to deliver high productivity while maintaining user-friendly operation.
4Adaptability or versatility
If manual grinding is performed, then flexibility in handling complex shapes is maintained, but labor intensity increases and health risks arise
Solution Approach 1:
The patent replaces manual grinding with an automated machine that uses programmable positioning and controlled motion to handle complex spacer grid shapes. The machine maintains flexibility through computer-controlled adaptation to different geometries while eliminating direct human exposure to health risks associated with manual grinding operations.
Solution Approach 2:
The grinding machine incorporates dynamic positioning systems and adjustable tool paths that can adapt to various spacer grid configurations. This dynamic capability allows the machine to maintain flexibility in handling complex shapes through programmed movements and real-time adjustments, while operators remain protected from harmful exposure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances productivity, improves working conditions by reducing noise and dust, and ensures uniformity and precision in grinding, thereby optimizing the production process and preventing musculoskeletal diseases.
Implementation Method 1
a grinding wheel 32 for grinding an outer surface of the spacer grid 1
Data Source
AI summary
A machine and a method for grinding a spacer grid of a nuclear fuel assembly. The machine includes a spacer grid holding unit, a first rectangular coordinates robot for grinding an outer surface of the spacer grid, a second rectangular coordinates robot for grinding a corner of the spacer grid, and a control unit. The spacer grid holding unit includes a holding jig onto which the spacer grid is seated and held, and a rotary index table which is coupled to the holding jig to rotate the holding jig. The first and second rectangular coordinates robots are provided at predetermined positions adjacent to the spacer grid holding unit. The control unit controls the spacer grid holding unit, the first and second rectangular coordinates robots and all programs required to conduct the operation for grinding the spacer grid.