China Mechanical Engineering ›› 2021, Vol. 32 ›› Issue (19): 2383-2389.

### Analysis of Mechanics Characteristics and Contact Performance for Electrical Contacts under Great Temperature Variation Conditions

XIAO Shihong1;ZHANG Jingke1;ZHANG Huiyao2;ZHOU Shichao1;HE Xianyou1;YUE Linlin1

1. 1.School of Mechatronic Engineering，Southwest Petroleum University，Chengdu，610500
2.School of Information，Southwest Petroleum University，Nanchong，Sichuan，637001
• Online:2021-10-10 Published:2021-11-05

### 大变温工况下电接触件的力学特性与接触性能分析

1. 1.西南石油大学机电工程学院，成都，610500
2.西南石油大学信息学院，南充，637001
• 作者简介:肖仕红，女，1976年生，副教授。研究方向为智能钻井技术。E-mail：xiaoshihongswpu@126.com。
• 基金资助:
国家重点研发计划（2016YFC0802102-03）；
四川省教育厅项目（省679）

Abstract: In order to improve the electrical contact performances of crown spring contacts for electric drill pipes under great temperature variation drilling conditions， the mechanics properties and electrical contact performances of the contacts were studied. Based on the static and thermo-mechanics coupling finite element analysis method， the relationships between the deflection of the reed and the contact pressure， the insertion force and the insertion depth of the pin were analyzed. The variation laws of insertion forces， contact pressures and contact areas for contact parts with different assembly gaps were studied under great temperature variation conditions. The results show that the contact pressure increases with the increase of deflection， and the increases decrease accordingly， and the insertion forces first increase and then decrease with the insertion depths and finally stabilize. The temperature rise causes the contact pressures and contact areas of the contacts to decrease， which reduces the electrical contact performance. When the assembly gap is as 0.07 mm≤δ≤0.2 mm， the impacts on the electrical contact performance are small. Considering the contact pressure， contact area and maximum equivalent plastic strain at 150 ℃， the optimal assembly gap of crown spring contact is as 0.07 mm. The research results may provide references for the structural design and optimization of crown spring contacts for electric drill pipes.

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