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国内建筑业正在试验和推广一种膨胀螺钉(见图1)。现将有关情况简介如下。1.结构形式:膨胀螺钉(见图1)由膨胀管3、螺钉1、卡爪垫圈2和翻边螺母4组成。膨胀管3的外形象一个灯笼状的管体,又称花篮管体。管体由0.75毫米厚的钢板经冲压后制成。管的两端分别点焊卡爪垫圈2和翻边螺母4。螺钉1由卡爪垫圈2一边穿进,并拧在翻边螺母4上。
The domestic construction industry is testing and promoting an expansion screw (see Figure 1). The relevant briefings are as follows. 1. Structure: Expansion screw (see Figure 1) consists of expansion tube 3, screw 1, claw washer 2 and flange nut 4. Expansion tube 3 looks like a lantern-shaped tube, also known as the flower basket body. The pipe body is made of 0.75 mm thick steel plate after stamping. Both ends of the pipe are respectively spot-welded with a washer washer 2 and a burring nut 4. The screw 1 is inserted by the pawl washer 2 and screwed onto the burring nut 4.