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新莆京股份

CHINSC

节能环保 绿色科技 和谐发展 造福人类

19

2017

-

09

新莆京变频器在电脑绣花(缝纫)机上的应用

作者:


一、引言

改革开放以来,我国的纺织机械行业的自动化技术有较明显的提高,纺织设备的大部分机器采用了变频调速技术、可编程控器(PLC)技术,也已有相当一部分的产品采用了工控机、单片机、交流伺服系统、触摸屏人机界面以及现场总线技术,实现了机械产品的机电一体化,为纺织机械的自动化、高速化、连续化铺平了道路。

二、电脑绣花机的原理

首先,用刺绣CAD软件制版,生产样板后,将载有刺绣程序及花样的盘片先后分别放入电脑磁盘驱动器中,在过程控制下,电脑将花样坐标值换成与绸框X、Y方向位移量相当之电信号,送到X、Y步进电机,带动绸框完成X、Y间的进给运动;同时变频器驱动变频电机,带动机针作上下运动,从而使刺绣连续地进行下去。

变频电机通过皮带驱动机头传动机构旋转,机头的特定机构使引线机构和机针带头着面线作出上、下运动,穿刺面料;钩线机构中的旋梭旋转,使面线绕过藏有底线梭壳;挑线机构运动,输送面线,收紧线迹准备下一个线迹的面线线段。X、Y步进电机通过同步齿形等待机构代工线框和面料做平面运动。将面料上每个待绣线迹点送往机针刺绣,机针上下运动的速度与绸框移动的方向、移动量以及移动速度的协调配合运动,使面线和底线绞合,在面料上作出双线锁式线迹。当刺绣连续地进行下去,完成花样的电脑刺绣。

三、SVF-EV变频器在电脑绣花机上的应用

SVF-EV变频器应用于电脑绣花机,有良好的运行特性。

1)高速处理器提供更快的频率响应

SVF-EV变频器采用DSP电机驱动专用CPU,提供高控制精度、快速频率响应及良好的动态特性。电脑绣花机要求通过LCD设定主轴的转速,经过单片机处理后,由D/A转换模块输出0-10V的模拟量信号到变频器,变频器根据模拟量信号的大小,快速响应到达所设转速,满足刺绣时多变得要求。

2)矢量控制提供低频时高转矩输出

电机与主轴之间采用1:3的带传动,在基频以下改变频率为恒转矩输出。以往使用V/F控制的变频器,由于考虑到负载的启动转矩大,要设定相应的转矩提升准位,如果转矩提升设置过高,在低频时轻载时会过激磁,引起电流过大,电机发热,严重影响到设备的正常运行。采用SVF-EV变频器可以通过参数设置,保证电机在低频时具有良好的转矩输出,满足绣花机在低速时连续走线。

3)良好的刹车能力实现针头的准停

由于在刺绣过程中,需要移动绸框和面料来完成整幅画面。移动过程中,要求针头停留在最高位。这一要求就需要用变频器的直流刹车能力来实现,SVF-EV变频器的直流刹车准,给使用者提供了一个很宽的调节范围,使用者可以根据负载惯性的大小调整参数设置,实现动作要求。

四、结束语

SVF-EV变频器与其它电器设备相配合的绣花机控制系统,能够满足刺绣的工艺要求,达到刺绣画面的整洁、美观。同时变频器运行稳定,给广大客户和使用者明显的经济效益。

这里是占位文字

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