过去我們在立式车床上装夹工件时,都是使用普通千斤顶做支承,由于普通千斤顶的底座不能同工作台紧固在一起,因而在工作中常常发生千斤顶松动和被离心力甩在外边的现象。为了保证安全,及时地解决这个问题,我们设计并制造了一个可以锁紧在工作台上的安全千斤顶。它的结构如附图所示:2是底座,本身的丁字头可插入工作台的丁字槽内。3是锁紧套,它可以把底座紧固在工作台上。1是顶絲,用以支承工件。4是可换垫圈, In the past, when we used the vertical lathe to clamp workpieces, ordinary jacks were used to support them. Since the base of ordinary jacks could not be fastened with the workbench, jacks often loosened and were left on the outside by centrifugal force. In order to ensure a safe and timely solution to this problem, we designed and manufactured a safety jack that can be locked to the workbench. Its structure as shown in the figure: 2 is the base, the T-prefix itself can be inserted into the workbench T-slot. 3 is a locking sleeve, which can be fastened to the base on the table. 1 is the top wire, to support the workpiece. 4 is a changeable gasket,