Fault Analysis and Optimization Design of Key Shaft for Operating Mechanism of Molded Case Circuit Breaker

doi:10.16628/j.cnki.2095-8188.2024.09.006

Abstract

Abstract:

Based on the physical prototype of molded case circuit breaker, the bending failure of the buckle shaft in the operating mechanism is analyzed during the mechanical life test, the theoretical calculation process of the buckle shaft is given, the cause of the buckle shaft bending failure is explained, and the two commonly used materials are screened and the optimal solution is given.The finite element model of the buckle shaft is established by Ansys Workbench software, the bending fault of the buckle shaft is restored by static structure analysis, and the strength of the optimized buckle shaft is checked.The combination of theoretical calculation and simulation analysis can provide a reference for the independent design and optimization of the key shaft of the operating mechanism and other components of the molded case circuit breaker.

Key words: molded case circuit breaker (MCCB), operating mechanism, buckle shaft, Ansys Workbench, strength

CLC Number:

TM561

XIANG Xiaoqing. Fault Analysis and Optimization Design of Key Shaft for Operating Mechanism of Molded Case Circuit Breaker[J]. LOW VOLTAGE APPARATUS, 2024, 0(9): 34-37.

Figures/Tables 13

References 8

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材料名称	密度/(g·cm^-3)	弹性模量/GPa	泊松比
45#	7.85	210	0.3
40Cr	7.83	211	0.3

材料名称	仿真分析最大应力/MPa	弯曲疲劳极限应力/MPa
45#	343.38	275
40Cr	152.46	355

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