基于压电黏合体的电磁选针检测技术

Detection technology for electromagnetic needle selection based on piezoelectric adhesive assembly

为解决现有针织机电磁选针器在提花作业中存在织物花型失真、次品率难以降低的问题,提出基于压电黏合体的选针动作信号检测方案。通过设计选针器挡板振动特性检测实验,分析挡板受迫振动的信号特性,探索将挡板受迫振动的冲击力信号作为检测选针动作关键数据的可行性;同时制备压电黏合体来感知挡板的微力应变以实现选针动作的冲击力信号的检测;并对所设计的压电黏合体频谱进行分析,对其进行电学建模及振动信号检测电路的设计,提出基于振动信号检测反馈机制的电磁选针半闭环控制策略。结果表明:在现场工况下本控制策略能够实现针对选针器提花动作的实时监测与有效性反馈,为降低提花作业中布匹的次品率提供了技术解决途径。

Aiming at the distortion of cloth pattern caused by electromagnetic needle selector in jacquard knitting machine and high level defects,a signal detection scheme for needle selection based on a piezoelectric adhesive assembly is proposed.The detection experiment of vibration characteristics of the baffle of needle selector was designed,the signal characteristics of the forced vibration of the baffle was analyzed,and the feasibility of using the impact force signal of the forced baffle vibration was verified as the key data for detecting whether the action of the needle selection is effective.The piezoelectric adhesive assembly was prepared through experiments to sense the strain of micro-force of the baffle to facilitate the detection of the impact force signal associated to the needle selection.Based on the analysis of the frequency spectrum of the designed piezoelectric adhesive assembly,electrical modeling was carried out,the detection circuit of vibrating signal was designed,and a semi-closed loop control strategy of electromagnetic needle selection based on the feedback mechanism of signal detection of the vibration was proposed,which helps achieve the real-time monitoring and effectiveness feedback for the jacquard action of the needle selector under the on-site working conditions.This work provides a technical solution for reducing the defective rate of fabrics in the jacquard operation.