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塑钢门窗近几年在国内方兴未艾,传统塑钢门窗都是推拉窗,但推拉窗气密性和开启方式等方面存在一系列不便和缺陷,而随着人们生活水平的提高,平开翻转窗开始进入市场。平开翻转窗和推拉窗的结构区别在于五金件上,目前国内平开翻转窗五金件主要从国外进口。北新建材(集团)有限公司2001年在国家经贸委的支持下上马全国第一条全自动门窗五金冲压线,对于生产出来的五金件质量的寿命检测是一个新的问题。
五金件质量的寿命检测目前国内没有标准,我们参考欧洲的标准主要有以下几方面要求:
1:开启寿命:要求不低于50000次,动作要求模拟人工开启门窗,即先平开,执手在第一开关位置时(如图1中位置),为起始位置。逆时针转动90。 到平开位置,水平向外平开,窗扇开启大约35。(以平开转轴位置为轴心),然后关闭窗扇,将执手顺时针旋转90。 到关闭位置;平开动作结束,执手回到第一开关位置时,再将执手逆时针转动180。 到上悬位置,向外、向下拉平开上悬,窗扇开启大约15。(以平开下转轴位置为轴心),然后关闭窗扇,将执手顺时针旋转180。 到关闭位置;此平开与上悬为一个动作周期,为一次平开上悬开启。
2:开启频率:检测频率为5次/分
3:开关门窗力不大于100N,开启执手力矩不大于1N.m;
据笔者在国内和欧洲五大五金件生产厂参观的结果看,主要是用气缸来实现以上动作,虽然基本可以实现动作,但如果窗型复杂,这种设备适用的灵活性和方便性极差,我们考虑用伺服电机和滚珠丝杠来实现以上动作并克服其弊端,设备已调试完毕,运行效果良好。
我们用两台伺服电机,这里我们选用了三菱公司的MR-J2S-A型伺服电机,一台用于开执手,一台用于开窗扇,用三菱公司的FX2N型PLC控制整个系统的协调工作,系统的状态由触摸屏来显示和调整,如工作频率和次数的设定,实际工作次数、系统故障原因及拉力和扭力的显示。拉执手的长杆在执手
接头处有一类似于机器手的万向接,便于换向。
现将系统的工作流程描述于下:
1) 在触摸屏上设定工作频率和次数和窗型大小。
2) 在操作台上选定是要进行平开检测还是要进行平开上悬开检测(以下以平开上悬为例描述),启动任务,系统开始运行。
3) 首先1号伺服将执手逆时针旋转90o到平开位置,即将执手置于水平位置。
4) 2号伺服沿丝杠方向将窗扇通过执手往外平开,窗扇开启大约35。(以平开转轴位置为轴心,即1图中的2处)。
5) 2号伺服沿丝杠方向将窗扇通过执手往里关上。
6) 1号伺服将执手顺时针旋转90o到关闭位置,即起点位置。以上完成一次平开检测。
7) 1号伺服将执手逆时针旋转180o到上悬位置,即和窗扇平行位置。
8) 2号伺服沿丝杠方向将窗扇通过执手往外平开,窗扇开启大约15。(以平开下转轴位置为轴心,即1图中的1处)。
9) 2号伺服沿丝杠方向将窗扇通过执手往里关上。
10) 1号伺服将执手顺时针旋转180o到关闭位置,即起点位置。以上完成一次平开上悬检测。
以上是实验机的工作流程,由于窗型大小不一,窗扇开启35o时,2号伺服
沿丝杠方向行走距离不一样,所以每次实验开始必须要在触摸屏上选定窗型大小,另外有外平开和平开上悬窗户的区别,它们的工作流程也不一样,所以要在工作前选好,否则会损坏五金件。
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