Keyless cooperation equipment dismounting and mounting method based on cooperation of cold contraction and heat expansion of liquid nitrogen

By using liquid nitrogen to synergistically reduce thermal expansion and contraction, the problems of rough dimensional measurement and parameter calculation, insufficient tool and equipment preparation, and inadequate safety during the disassembly and assembly of keyless mating equipment have been solved. This has enabled precise disassembly and assembly, reduced the failure rate and damage risk, and improved equipment maintenance efficiency and safety.

CN122007802APending Publication Date: 2026-05-12SHANXI ZHONGYANG IRON & STEEL
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Patent Information

Application Number
CN202610286405.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-03-10
Publication Date
2026-05-12

AI Technical Summary

Technical Problem

The existing disassembly and assembly process for keyless mating equipment suffers from problems such as crude dimensional measurement and parameter calculation, insufficient preparation of tools and equipment, and inadequate safety, resulting in a high failure rate and component damage.

Method used

By employing a liquid nitrogen cooling and thermal expansion synergy method, through precise measurement and parameter calculation, rigorous tool and equipment inspection, safety protection and environmental control, combined with thermal expansion and contraction technology, the accuracy and safety of the disassembly and assembly process are ensured.

Benefits of technology

It improves the accuracy of dimensional measurement and parameter calculation, reduces the failure rate of disassembly and assembly, ensures the reliability and operational safety of tools and equipment, prevents component damage, optimizes the thermal expansion and contraction process, and reduces subsequent repair procedures and maintenance costs.

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Abstract

The invention relates to the technical field of mechanical engineering, and discloses a keyless cooperation equipment disassembly and assembly method based on cooperation of cold contraction and heat expansion of liquid nitrogen, and the method comprises the steps of S1, early-stage general preparation, S2, specific disassembly, S3, specific assembly and S4, key quality control. Multi-point measurement is carried out on the outer diameter of the shaft and the inner hole of the mating part through a micrometer and a dial indicator tool (the measurement section of the outer diameter of the shaft is larger than or equal to 3, and the measurement mode of the inner hole is coaxial with the outer diameter of the shaft), the thermal expansion and cold shrinkage target size is calculated by combining the thermal expansion coefficient and the cold shrinkage coefficient of a part material, and it is ensured that the actual interference magnitude is stabilized within the design range of 0.08 mm-0. 1 mm; disassembly and assembly clamping stagnation or part damage caused by parameter deviation is effectively avoided, and the disassembly and assembly failure rate is reduced to the minimum.
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