划线工人对工件进行立体划线时,通常都是用三个螺旋支持器(千斤顶)对工件作三点支承。这种办法,在遇到形状特殊的工件时,使用起来非常不便,甚至无法使用。有时,还因使用不慎造成工件坍塌,不够安全。在缺乏吊装设备的小厂,对大型划线工件的顶持更是困难和不安全。为了克服这些缺点,我们设计制造了一种划线三角架。通过长期使用,证明这是一种比较 Marking workers three-dimensional marking of the workpiece, usually with three spiral support (jack) on the workpiece for three-point support. This approach, in the face of special shape of the workpiece, the use of very inconvenient, or even unusable. Sometimes, due to accidental use of the workpiece collapsed, not safe enough. In the small factories that lack lifting equipment, it is more difficult and unsafe to hold a large underline workpiece. In order to overcome these shortcomings, we designed and manufactured a crossed tripod. Through long-term use, this is a comparison