Bi-directional SCR can be regarded as a general anti-parallel connected SCR's integration with the general principle of the same one-way thyristor. Figure 1 The basic structure of a two-way thyristor and its equivalent circuit, it has two main electrodes T1 and T2, a gate G, the device gate electrode in the main direction can trigger both positive and negative conduction, Therefore, two-way thyristor in the first quadrant 1 and 3 have symmetrical volt-ampere characteristics. TRIAC gate plus positive and negative trigger pulse can trigger the conduction tube so that, it means there are four types of trigger.行业内对
防火等级的测试通常采用美国UL标准,对于
硅胶类产品,专业的阻燃防火硅胶必须要达到UL-94V0级别。
阻燃防火硅胶的工艺主要是通过铂化合物特殊工艺实现,与其搭配的方法有几种,比如中粒子热裂炭黑、气相法白炭黑、氢氧化铝粉末、三唑化合物、三异氰酸脂等。阻燃防火硅胶具有优良的阻燃防火功能,久烧不燃;具有优异的耐高低温性能(可长期在-50到250度使用)
防火等级UL94级别要求:
94V-0
A:没有任何样品在测试火焰拿走之后,仍然有火苗燃烧超过10 秒。
B:对于每套5 件样品,10 次点燃后,带火苗的燃烧的总共时间不超过50 秒
C:没有任何样品一直烧到夹具上
D:没有任何样品,燃烧融化的液滴滴下点燃了下面12"处的棉花。
E:没有任何样品,在第二次移走测试火焰之后,持续发红燃烧超过30 秒。
深钻孔的指令是 MCALL CYCLE83(50,0,5, -100,,10,10,10,,,3,,,1,1)
50是退刀 0是参考平面 5是全距离 -100是最后钻孔深度 10是钻10个退出来排屑 3是主轴正转
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